LT1963A Series 1.5A, Low Noise, Fast Transient Response LDO Regulators FeaTures DescripTion n Optimized for Fast Transient Response The LT®1963A series are low dropout regulators optimized n Output Current: 1.5A for fast transient response. The devices are capable of n Dropout Voltage: 340mV supplying 1.5A of output current with a dropout voltage of n Low Noise: 40µVRMS (10Hz to 100kHz) 340mV. Operating quiescent current is 1mA, dropping to n 1mA Quiescent Current <1µA in shutdown. Quiescent current is well controlled; it n No Protection Diodes Needed does not rise in dropout as it does with many other regula- n Controlled Quiescent Current in Dropout tors. In addition to fast transient response, the LT1963A n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V regulators have very low output noise which makes them n Adjustable Output from 1.21V to 20V ideal for sensitive RF supply applications. n <1µA Quiescent Current in Shutdown Output voltage range is from 1.21V to 20V. The LT1963A n Stable with 10µF Output Capacitor* regulators are stable with output capacitors as low as n Stable with Ceramic Capacitors* 10µF. Internal protection circuitry includes reverse bat- n Reverse Battery Protection tery protection, current limiting, thermal limiting and n No Reverse Current reverse current protection. The devices are available in n Thermal Limiting fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as n 5-Lead TO-220, DD, 3-Lead SOT-223 and an adjustable device with a 1.21V reference voltage. The 8-Lead SO Packages LT1963A regulators are available in 5-lead TO-220, DD, 3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages. applicaTions L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property n 3.3V to 2.5V Logic Power Supplies of their respective owners. Protected by U.S. Patents including 6118263, 6144250. n Post Regulator for Switching Supplies *See Applications Information Section. Typical applicaTion Dropout Voltage 3.3V to 2.5V Regulator 400 350 + IN OUT + 21..55VA mV) 300 VIN > 3V 10µF* LT1963A-2.5 10µF* GE ( 250 A T L SHDN SENSE VO 200 T GND *TANTALUM, OU 150 CERAMIC OR P O ALUMINUM ELECTROLYTIC R D 100 1963A TA01 50 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 OUTPUT CURRENT (A) 1963A TA02 1963aff 1 For more information www.linear.com/LT1963A

LT1963A Series absoluTe MaxiMuM raTings (Note 1) IN Pin Voltage ........................................................±20V Operating Junction Temperature Range (Note 3) OUT Pin Voltage ......................................................±20V LT1963AE ...........................................–40°C to 125°C Input to Output Differential Voltage (Note 2) ...........±20V LT1963AI............................................–40°C to 125°C SENSE Pin Voltage ............................................... ±20V LT1963AMP .......................................–55°C to 125°C ADJ Pin Voltage ...................................................... ±7V Storage Temperature Range ...................–65°C to 150°C SHDN Pin Voltage ................................................. ±20V Lead Temperature (Soldering, 10 sec) ..................300°C Output Short-Circuit Duration ........................ Indefinite pin conFiguraTion TOP VIEW GND 1 16 GND NC 2 15 NC FRONT VIEW FRONT VIEW SENSE/ OUT 3 14 IN 5 SENSE/ADJ* 5 ADJ* OUT 4 13 IN 4 OUT 4 OUT 17 TAB IS OUT 5 12 IN 3 GND 3 GND GND SENSE/ADJ* 6 11 NC 2 IN 2 IN 1 SHDN 1 SHDN GND 7 10 SHDN GND 8 9 GND Q PACKAGE TAB IS T PACKAGE 5-LEAD PLASTIC DD GND 5-LEAD PLASTIC TO-220 FE PACKAGE *PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ *PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ 16-LEAD PLASTIC TSSOP LT1963A-2.5/LT1963A-3.3 LT1963A-2.5/LT1963A-3.3 EXPOSED PAD (PIN 17) IS GND. MUST BE = ADJ FOR LT1963A = ADJ FOR LT1963A SOLDERED TO THE PCB. TJMAX = 150°C, θJA = 30°C/W TJMAX = 150°C, θJA = 50°C/W *PIN 6 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ LT1963A-2.5/LT1963A-3.3 = ADJ FOR LT1963A TJMAX = 150°C, θJA = 38°C/W FRONT VIEW TOP VIEW 3 OUT OUT 1 8 IN TAB IS SENSE/ADJ* 2 7 GND GND 2 GND GND 3 6 GND 1 IN NC 4 5 SHDN S8 PACKAGE ST PACKAGE 8-LEAD PLASTIC SO 3-LEAD PLASTIC SOT-223 TJMAX = 150°C, θJA = 50°C/W *PIN 2 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ LT1963A-2.5/LT1963A-3.3 = ADJ FOR LT1963A TJMAX = 150°C, θJA = 70°C/W 1963aff 2 For more information www.linear.com/LT1963A

LT1963A Series orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AEQ#PBF LT1963AEQ#TRPBF LT1963AEQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AIQ#PBF LT1963AIQ#TRPBF LT1963AIQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AMPQ#PBF LT1963AMPQ#TRPBF LT1963AMPQ 5-Lead Plastic DD-Pak –55°C to 125°C LT1963AEQ-1.5#PBF LT1963AEQ-1.5#TRPBF LT1963AEQ-1.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-1.8#PBF LT1963AEQ-1.8#TRPBF LT1963AEQ-1.8 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-2.5#PBF LT1963AEQ-2.5#TRPBF LT1963AEQ-2.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-3.3#PBF LT1963AEQ-3.3#TRPBF LT1963AEQ-3.3 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AET#PBF LT1963AET#TRPBF LT1963AET 5-Lead Plastic TO-220 –40°C to 125°C LT1963AIT#PBF LT1963AIT#TRPBF LT1963AIT 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.5#PBF LT1963AET-1.5#TRPBF LT1963AET-1.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.8#PBF LT1963AET-1.8#TRPBF LT1963AET-1.8 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-2.5#PBF LT1963AET-2.5#TRPBF LT1963AET-2.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-3.3#PBF LT1963AET-3.3#TRPBF LT1963AET-3.3 5-Lead Plastic TO-220 –40°C to 125°C LT1963AEFE#PBF LT1963AEFE#TRPBF 1963AEFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AIFE#PBF LT1963AIFE#TRPBF 1963AIFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.5#PBF LT1963AEFE-1.5#TRPBF 1963AEFE15 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.8#PBF LT1963AEFE-1.8#TRPBF 1963AEFE18 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-2.5#PBF LT1963AEFE-2.5#TRPBF 1963AEFE25 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-3.3#PBF LT1963AEFE-3.3#TRPBF 1963AEFE33 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEST-1.5#PBF LT1963AEST-1.5#TRPBF 963A15 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-1.8#PBF LT1963AEST-1.8#TRPBF 963A18 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-2.5#PBF LT1963AEST-2.5#TRPBF 963A25 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-3.3#PBF LT1963AEST-3.3#TRPBF 963A33 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AES8#PBF LT1963AES8#TRPBF 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AIS8#PBF LT1963AIS8#TRPBF 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AMPS8#PBF LT1963AMPS8#TRPBF 963AMP 8-Lead Plastic SO –55°C to 125°C LT1963AES8-1.5#PBF LT1963AES8-1.5#TRPBF 963A15 8-Lead Plastic SO –40°C to 125°C LT1963AES8-1.8#PBF LT1963AES8-1.8#TRPBF 963A18 8-Lead Plastic SO –40°C to 125°C LT1963AES8-2.5#PBF LT1963AES8-2.5#TRPBF 963A25 8-Lead Plastic SO –40°C to 125°C LT1963AES8-3.3#PBF LT1963AES8-3.3#TRPBF 963A33 8-Lead Plastic SO –40°C to 125°C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AEQ LT1963AEQ#TR LT1963AEQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AIQ LT1963AIQ#TR LT1963AIQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AMPQ LT1963AMPQ#TR LT1963AMPQ 5-Lead Plastic DD-Pak –55°C to 125°C LT1963AEQ-1.5 LT1963AEQ-1.5#TR LT1963AEQ-1.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-1.8 LT1963AEQ-1.8#TR LT1963AEQ-1.8 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-2.5 LT1963AEQ-2.5#TR LT1963AEQ-2.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-3.3 LT1963AEQ-3.3#TR LT1963AEQ-3.3 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AET LT1963AET#TR LT1963AET 5-Lead Plastic TO-220 –40°C to 125°C LT1963AIT LT1963AIT#TR LT1963AIT 5-Lead Plastic TO-220 –40°C to 125°C 1963aff 3 For more information www.linear.com/LT1963A

LT1963A Series orDer inForMaTion LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AET-1.5 LT1963AET-1.5#TR LT1963AET-1.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.8 LT1963AET-1.8#TR LT1963AET-1.8 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-2.5 LT1963AET-2.5#TR LT1963AET-2.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-3.3 LT1963AET-3.3#TR LT1963AET-3.3 5-Lead Plastic TO-220 –40°C to 125°C LT1963AEFE LT1963AEFE#TR 1963AEFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AIFE LT1963AIFE#TR 1963AIFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.5 LT1963AEFE-1.5#TR 1963AEFE15 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.8 LT1963AEFE-1.8#TR 1963AEFE18 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-2.5 LT1963AEFE-2.5#TR 1963AEFE25 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-3.3 LT1963AEFE-3.3#TR 1963AEFE33 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEST-1.5 LT1963AEST-1.5#TR 963A15 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-1.8 LT1963AEST-1.8#TR 963A18 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-2.5 LT1963AEST-2.5#TR 963A25 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-3.3 LT1963AEST-3.3#TR 963A33 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AES8 LT1963AES8#TR 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AIS8 LT1963AIS8#TR 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AMPS8 LT1963AMPS8#TR 963AMP 8-Lead Plastic SO –55°C to 125°C LT1963AES8-1.5 LT1963AES8-1.5#TR 963A15 8-Lead Plastic SO –40°C to 125°C LT1963AES8-1.8 LT1963AES8-1.8#TR 963A18 8-Lead Plastic SO –40°C to 125°C LT1963AES8-2.5 LT1963AES8-2.5#TR 963A25 8-Lead Plastic SO –40°C to 125°C LT1963AES8-3.3 LT1963AES8-3.3#TR 963A33 8-Lead Plastic SO –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 1963aff 4 For more information www.linear.com/LT1963A

LT1963A Series elecTrical characTerisTics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 3) A PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage (Notes 4,12) I = 0.5A 1.9 V LOAD I = 1.5A l 2.1 2.5 V LOAD Regulated Output Voltage (Note 5) LT1963A-1.5 V = 2.21V, I = 1mA 1.477 1.500 1.523 V IN LOAD 2.5V < V < 20V, 1mA < I < 1.5A l 1.447 1.500 1.545 V IN LOAD LT1963A-1.8 V = 2.3V, I = 1mA 1.773 1.800 1.827 V IN LOAD 2.8V < V < 20V, 1mA < I < 1.5A l 1.737 1.800 1.854 V IN LOAD LT1963A-2.5 V = 3V, I = 1mA 2.462 2.500 2.538 V IN LOAD 3.5V < V < 20V, 1mA < I < 1.5A l 2.412 2.500 2.575 V IN LOAD LT1963A-3.3 V = 3.8V, I = 1mA 3.250 3.300 3.350 V IN LOAD 4.3V < V < 20V, 1mA < I < 1.5A l 3.200 3.300 3.400 V IN LOAD ADJ Pin Voltage (Notes 4, 5) LT1963A V = 2.21V, I = 1mA 1.192 1.210 1.228 V IN LOAD 2.5V < V < 20V, 1mA < I < 1.5A l 1.174 1.210 1.246 V IN LOAD Line Regulation LT1963A-1.5 ∆V = 2.21V to 20V, I = 1mA l 2.0 6 mV IN LOAD LT1963A-1.8 ∆V = 2.3V to 20V, I = 1mA l 2.5 7 mV IN LOAD LT1963A-2.5 ∆V = 3V to 20V, I = 1mA l 3.0 10 mV IN LOAD LT1963A-3.3 ∆V = 3.8V to 20V, I = 1mA l 3.5 10 mV IN LOAD LT1963A (Note 4) ∆V = 2.21V to 20V, I = 1mA l 1.5 5 mV IN LOAD Load Regulation LT1963A-1.5 V = 2.5V, ∆I = 1mA to 1.5A 2 9 mV IN LOAD V = 2.5V, ∆I = 1mA to 1.5A ● 18 mV IN LOAD LT1963A-1.8 V = 2.8V, ∆I = 1mA to 1.5A 2 10 mV IN LOAD V = 2.8V, ∆I = 1mA to 1.5A ● 20 mV IN LOAD LT1963A-2.5 V = 3.5V, ∆I = 1mA to 1.5A 2.5 15 mV IN LOAD V = 3.5V, ∆I = 1mA to 1.5A ● 30 mV IN LOAD LT1963A-3.3 V = 4.3V, ∆I = 1mA to 1.5A 3 20 mV IN LOAD V = 4.3V, ∆I = 1mA to 1.5A ● 35 mV IN LOAD LT1963A (Note 4) V = 2.5V, ∆I = 1mA to 1.5A 2 8 mV IN LOAD V = 2.5V, ∆I = 1mA to 1.5A ● 15 mV IN LOAD Dropout Voltage I = 1mA 0.02 0.06 V LOAD VIN = VOUT(NOMINAL) ILOAD = 1mA ● 0.10 V (Notes 6, 7, 12) I = 100mA 0.10 0.17 V LOAD I = 100mA ● 0.22 V LOAD I = 500mA 0.19 0.27 V LOAD I = 500mA ● 0.35 V LOAD I = 1.5A 0.34 0.45 V LOAD I = 1.5A ● 0.55 V LOAD GND Pin Current I = 0mA ● 1.0 1.5 mA LOAD V = V + 1V I = 1mA ● 1.1 1.6 mA IN OUT(NOMINAL) LOAD (Notes 6, 8) I = 100mA ● 3.8 5.5 mA LOAD I = 500mA ● 15 25 mA LOAD I = 1.5A ● 80 120 mA LOAD Output Voltage Noise C = 10µF, I = 1.5A, BW = 10Hz to 100kHz 40 µV OUT LOAD RMS ADJ Pin Bias Current (Notes 4, 9) 3 10 µA Shutdown Threshold V = Off to On ● 0.90 2 V OUT V = On to Off ● 0.25 0.75 V OUT SHDN Pin Current (Note 10) V = 0V 0.01 1 µA SHDN V = 20V 3 30 µA SHDN Quiescent Current in Shutdown V = 6V, V = 0V 0.01 1 µA IN SHDN 1963aff 5 For more information www.linear.com/LT1963A

LT1963A Series elecTrical characTerisTics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 3) A PARAMETER CONDITIONS MIN TYP MAX UNITS Ripple Rejection V – V = 1.5V (Avg), V = 0.5V , 55 63 dB IN OUT RIPPLE P-P f = 120Hz, I = 0.75A RIPPLE LOAD Current Limit V = 7V, V = 0V 2 A IN OUT V = V + 1V, ∆V = –0.1V ● 1.6 A IN OUT(NOMINAL) OUT Input Reverse Leakage Current (Note 13) Q, T, S8 Packages V = –20V, V = 0 ● 1 mA IN OUT ST Package V = –20V, V = 0 ● 2 mA IN OUT Reverse Output Current (Note 11) LT1963A-1.5 V = 1.5V, V < 1.5V 600 1200 µA OUT IN LT1963A-1.8 V = 1.8V, V < 1.8V 600 1200 µA OUT IN LT1963A-2.5 V = 2.5V, V < 2.5V 600 1200 µA OUT IN LT1963A-3.3 V = 3.3V, V < 3.3V 600 1200 µA OUT IN LT1963A (Note 4) V = 1.21V, V < 1.21V 300 600 µA OUT IN Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 6: To satisfy requirements for minimum input voltage, the LT1963A may cause permanent damage to the device. Exposure to any Absolute (adjustable version) is tested and specified for these conditions with an Maximum Rating condition for extended periods may affect device external resistor divider (two 4.12k resistors) for an output voltage of 2.4V. The external resistor divider will add a 300µA DC load on the output. reliability and lifetime. Note 7: Dropout voltage is the minimum input to output voltage differential Note 2: Absolute maximum input to output differential voltage can not needed to maintain regulation at a specified output current. In dropout, the be achieved with all combinations of rated IN pin and OUT pin voltages. With the IN pin at 20V, the OUT pin may not be pulled below 0V. The total output voltage will be equal to: VIN – VDROPOUT. measured voltage from IN to OUT can not exceed ±20V. Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 1V and a Note 3: The LT1963A regulators are tested and specified under pulse load current source load. The GND pin current will decrease at higher input conditions such that T ≈ T . The LT1963AE is 100% tested at T = 25°C. voltages. J A A Performance at –40°C and 125°C is assured by design, characterization and Note 9: ADJ pin bias current flows into the ADJ pin. correlation with statistical process controls. The LT1963AI is guaranteed Note 10: SHDN pin current flows into the SHDN pin. over the full –40°C to 125°C operating junction temperature range. The Note 11: Reverse output current is tested with the IN pin grounded and the LT1963AMP is 100% tested and guaranteed over the –55°C to 125°C OUT pin forced to the rated output voltage. This current flows into the OUT operating junction temperature range. pin and out the GND pin. Note 4: The LT1963A (adjustable version) is tested and specified for these Note 12: For the LT1963A, LT1963A-1.5 and LT1963A-1.8 dropout voltage conditions with the ADJ pin connected to the OUT pin. will be limited by the minimum input voltage specification under some Note 5: Operating conditions are limited by maximum junction output voltage/load conditions. temperature. The regulated output voltage specification will not apply Note 13: For the ST package, the input reverse leakage current increases for all possible combinations of input voltage and output current. When due to the additional reverse leakage current for the SHDN pin, which is operating at maximum input voltage, the output current range must be tied internally to the IN pin. limited. When operating at maximum output current, the input voltage range must be limited. 1963aff 6 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage 500 600 500 = TEST POINTS 450 V) 450 m 400 E (500 400 V) AG TJ ≤ 125°C V) OLTAGE (m332505000 TJ = 125°C POUT VOLT430000 TJ ≤ 25°C OLTAGE (m332505000 IL = 1.5A V O V UT 200 TJ = 25°C DR UT 200 IL = 0.5A O D O OP150 EE200 OP150 R T R D100 ARAN100 D100 IL = 100mA 50 GU 50 IL = 1mA 0 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 OUTPUT CURRENT (A) OUTPUT CURRENT (A) TEMPERATURE (°C) 1963A G01 1963A G02 1963A G03 Quiescent Current LT1963A-1.5 Output Voltage LT1963A-1.8 Output Voltage 1.4 1.54 1.84 IL = 1mA IL = 1mA 1.2 LT1963A-1.5/1.8/-2.5/-3.3 1.53 1.83 UIESCENT CURRENT (mA) 1000....0864 LT1963A OUTPUT VOLTAGE (V)11111.....5455408219 OUTPUT VOLTAGE (V)11111.....8887721098 Q VIN = 6V 0.2 RL = ∞, IL = 0 1.47 1.77 VSHDN = VIN 0 1.46 1.76 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1963A G04 1963A G40 1963A G05 LT1963A-2.5 Output Voltage LT1963A-3.3 Output Voltage LT1963A ADJ Pin Voltage 2.58 3.38 1.230 IL = 1mA IL = 1mA IL = 1mA 2.56 3.36 1.225 2.54 3.34 1.220 V) V) V) GE (2.52 GE (3.32 GE (1.215 A A A T T T L L L O2.50 O3.30 O1.210 V V V T T N TPU2.48 TPU3.28 J PI1.205 U U D O O A 2.46 3.26 1.200 2.44 3.24 1.195 2.42 3.22 1.190 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1963A G06 1963A G07 1963A G08 1963aff 7 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics LT1963A-1.5 Quiescent Current LT1963A-1.8 Quiescent Current LT1963A-2.5 Quiescent Current 14 14 14 TJ = 25°C TJ = 25°C TJ = 25°C 12 RVSLH =D ∞N = VIN 12 RVSLH =D ∞N = VIN 12 RVSLH =D ∞N = VIN QUIESCENT CURRENT (mA) 18460 QUIESCENT CURRENT (mA) 10864 QUIESCENT CURRENT (mA) 10864 2 2 2 0 0 0 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1963A G41 1963A G09 1963A G10 LT1963A-3.3 Quiescent Current LT1963A Quiescent Current LT1963A-1.5 GND Pin Current 14 1.4 25 TJ = 25°C TJ = 25°C TJ = 25°C 12 RVSLH =D ∞N = VIN 1.2 RVSLH =D 4N. 3=k VIN 20 V*FSOHRDN V =O UVTIN = 1.5V QUIESCENT CURRENT (mA) 10864 QUIESCENT CURRENT (mA) 1000....0864 GND PIN CURRENT (mA) 11505 RL = 150, IL = 10mRRLA L*= = 1 55,, IILL == 310000mmAA** 2 0.2 0 0 0 0 1 2 3 4 5 6 7 8 9 10 0 2 4 6 8 10 12 14 16 18 20 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1963A G11 1963A G12 1963A G42 LT1963A-1.8 GND Pin Current LT1963A-2.5 GND Pin Current LT1963A-3.3 GND Pin Current 25 25 25 TJ = 25°C TJ = 25°C TJ = 25°C VSHDN = VIN VSHDN = VIN VSHDN = VIN 20 *FOR VOUT = 1.8V 20 *FOR VOUT = 2.5V 20 *FOR VOUT = 3.3V mA) mA) mA) RRENT ( 15 RRENT ( 15 RL = 8.33, IL = 300mA* RRENT ( 15 U U U D PIN C 10 RL = 6, IL = 300mA* D PIN C 10 D PIN C 10 RL = 11, IL = 300mA* N N N G 5 RL = 18, IL = 100mA* G 5 RL = 25, IL = 100mA* G 5 RL = 33, IL = 100mA* RL = 180, IL = 10mA* RL = 250, IL = 10mA* RL = 330, IL = 100mA* 0 0 0 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1963A G13 1963A G14 1963A G15 1963aff 8 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics LT1963A GND Pin Current LT1963A-1.5 GND Pin Current LT1963A-1.8 GND Pin Current 10 100 100 VTJS H=D 2N5 =°C VIN 90 VTJS H=D 2N5 =°C VIN 90 VTJS H=D 2N5 =°C VIN 8 *FOR VOUT = 1.21V 80 *FOR VOUT = 1.5V 80 *FOR VOUT = 1.8V mA) mA) 70 mA) 70 GND PIN CURRENT ( 64 RLR =L 1=2 4.1.3, 3IL, =IL 1=0 300m0Am*A* GND PIN CURRENT ( 64530000 RL = 1, IL = 1R.5LA =* 1.5, IL = 1A* GND PIN CURRENT ( 65430000 RL R= L1 .=8 ,1 I.L2 ,= I L1 A= *1.5A* 2 20 RL = 3, IL = 500mA* 20 RL = 121, IL = 10mA* 10 10 RL = 3.6, IL = 500mA* 0 0 0 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1963A G16 1963A G43 1963A G17 LT1963A-2.5 GND Pin Current LT1963A-3.3 GND Pin Current LT1963A GND Pin Current 100 100 100 TJ = 25°C TJ = 25°C TJ = 25°C 90 VSHDN = VIN 90 VSHDN = VIN 90 VSHDN = VIN 80 *FOR VOUT = 2.5V 80 *FOR VOUT = 3.3V 80 *FOR VOUT = 1.21V A) A) A) m 70 m 70 m 70 T ( RL = 1.67, IL = 1.5A* T ( RL = 2.2, IL = 1.5A* T ( N 60 N 60 N 60 E E E URR 50 URR 50 URR 50 RL = 0.81, IL = 1.5A* C C C N 40 N 40 N 40 GND PI 30 RL = 2.5, IL = 1A* GND PI 30 RL = 3.3, IL = 1A* GND PI 30 RL = 1.21, IL = 1A* 20 20 20 10 RL = 5, IL = 500mA* 10 RL = 6.6, IL = 500mA* 10 RL = 2.42, IL = 500mA* 0 0 0 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1963A G18 1963A G19 1963A G20 GND Pin Current vs ILOAD SHDN Pin Threshold (On-to-Off) SHDN Pin Threshold (Off-to-On) 100 1.0 1.0 VIN = VOUT (NOMINAL) +1V IL = 1mA 90 0.9 0.9 IL = 1.5A mA) 8700 D (V) 00..87 D (V) 00..87 NT ( 60 HOL 0.6 HOL 0.6 URRE 50 HRES 0.5 HRES 0.5 IL = 1mA GND PIN C 432000 SHDN PIN T 000...432 SHDN PIN T 000...432 10 0.1 0.1 0 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 OUTPUT CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 1963A G21 1963A G22 1963A G23 1963aff 9 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics SHDN Pin Input Current SHDN Pin Input Current ADJ Pin Bias Current 5.0 7 5.0 VSHDN = 20V 4.5 4.5 6 URRENT (µA) 433...050 URRENT (µA) 54 RRENT (µA) 433...050 T C 2.5 T C CU 2.5 N INPU 2.0 N INPU 3 N BIAS 2.0 N PI 1.5 N PI 2 J PI 1.5 D D D H 1.0 H A 1.0 S S 1 0.5 0.5 0 0 0 0 2 4 6 8 10 12 14 16 18 20 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SHDN PIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1963A G24 1963A G25 1963A G26 Current Limit Current Limit 3.0 4.0 VIN = 7V 3.5 VOUT = 0V 2.5 TJ = 25°C 3.0 CURRENT LIMIT (A) 211...050 TJ = 125°C TJ = –50°C CURRENT LIMIT (A) 2211....5050 0.5 0.5 ΔVOUT = 100mV 0 0 0 2 4 6 8 10 12 14 16 18 20 –50 –25 0 25 50 75 100 125 INPUT/OUTPUT DIFFERENTIAL (V) TEMPERATURE (°C) 1963A G27 1963A G28 Reverse Output Current Reverse Output Current 5.0 1.0 VIN = 0V 4.5 0.9 VOUT = 1.21V (LT1963A) NT (mA) 43..05 LLTT11996633AA-1-1.5.8 NT (mA) 00..87 VVVOOOUUUTTT === 112...585VVV (((LLLTTT111999666333AAA---112...585))) URRE 3.0 URRE 0.6 VOUT = 3.3V (LT1963A-3.3) C LT1963A C LT1963A-1.8/-2.5/-3.3 UT 2.5 UT 0.5 P P UT 2.0 UT 0.4 VERSE O 11..50 LT19L6T31A9-623.5A-3.3 VTCJIUN =R = R2 05EV°NCT FLOWS INTO VERSE O 00..32 LT1963A RE OUTPUT PIN RE 0.5 VOUT = VADJ (LT1963A) 0.1 0 VOUT = VFB (LT1963A-1.5/1.8/-2.5/-3.3) 0 0 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 OUTPUT VOLTAGE (V) TEMPERATURE (°C) 1963A G29 1963A G30 1963aff 10 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics Ripple Rejection Ripple Rejection LT1963A Minimum Input Voltage 80 76 3.0 70 74 TION (dB) 6500 TION (dB) 7720 VOLTAGE (V) 22..50 IL = 1.5A IL = 500mA REJEC 40 COUT = 100µF TANTALUM REJEC 68 NPUT 1.5 IL = 100mA PLE 30 +10 × 1µF CERAMIC PLE UM I 1.0 RIP 20 COUT = 10µF TANTALUM RIP 66 NIM MI 10 IL = 0.75A 64 VILI N= =0 .V7O5UAT(NOMINAL) +1V + 0.5VP-P 0.5 VIN = VOUT(NOMINAL) +1V + 50mVRMS RIPPLE RIPPLE AT f = 120Hz 0 62 0 10 100 1k 10k 100k 1M –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 FREQUENCY (Hz) TEMPERATURE (°C) TEMPERATURE (°C) 1963A G31 1963A G32 1963A G33 Load Regulation Output Noise Spectral Density 10 1.0 Hz) COUT = 10µF 5 µV/√ IL =1.5A V) LT1963A-1.5 TY ( m SI N ( 0 LT1963A EN ATIO LT1963A-1.8 AL D LT1963A-3.3 LT1963A-2.5 L –5 R 0.1 GU LT1963A-2.5 CT LOAD RE –10 VIN = VOUT(NOMINAL) +1V LT1963A-3.3 NOISE SPE LT1963A-1.8 LT1963A –15 VI(NL T=1 29.673VA (-L1T.81/9-623.5A//-L3T.31)963A-1.5) PUT LT1963A-1.5 –20 ΔIL = 1mA TO 1.5A OUT0.01 –50 –25 0 25 50 75 100 125 10 100 1k 10k 100k TEMPERATURE (°C) FREQUENCY (Hz) 1963A G34 1963A G35 RMS Output Noise vs Load Current (10Hz to 100kHz) LT1963A-3.3 10Hz to 100kHz Output Noise 50 COUT = 10µF 45 )S RM 40 LT1963A-3.3 V GE (µ 35 LT1963A-2.5 A 30 T E VOL 25 LT1963A-1.8 100µVV/ODUIVT OIS 20 T N 15 LT1963A-1.5 U P LT1963A UT 10 O 5 0 0.0001 0.001 0.01 0.1 1 10 COUT = 10µF 1ms/DIV 1963A G37 LOAD CURRENT (A) ILOAD = 1.5A 1963A G36 1963aff 11 For more information www.linear.com/LT1963A

LT1963A Series Typical perForMance characTerisTics LT1963A-3.3 Transient Response LT1963A-3.3 Transient Response 200 150 VIN = 4.3V OUTPUT VOLTAGE DEVIATION (mV)11–505500000 CCIONU =T =3 .130µµF FT TAANNTTAALLUUMM OUTPUT VOLTAGE DEVIATION (mV)–1–1055000000 –100 –150 LOADURRENT (A)000...642 LOAD URRENT (A)110...505 VCC+1IIONN0U ==T× = 431 .31µ3µ0FVF 0C TµEAFR NTATAMANLITCUAMLUM C 0 C 0 0 2 4 6 8 10 12 14 16 18 20 0 50 100150 200250 300350400 450500 TIME (µs) TIME (µs) 1963A G38 1963A G39 1963aff 12 For more information www.linear.com/LT1963A

LT1963A Series pin FuncTions OUT: Output. The output supplies power to the load. be off when the SHDN pin is pulled low. The SHDN pin can A minimum output capacitor of 10µF is required to be driven either by 5V logic or open-collector logic with a prevent oscillations. Larger output capacitors will be pull-up resistor. The pull-up resistor is required to supply required for applications with large transient loads to limit the pull-up current of the open-collector gate, normally peak voltage transients. See the Applications Information several microamperes, and the SHDN pin current, typically section for more information on output capacitance and 3µA. If unused, the SHDN pin must be connected to V . IN reverse output characteristics. The device will be in the low power shutdown state if the SHDN pin is not connected. SENSE: Sense. For fixed voltage versions of the LT1963A (LT1963A-1.5/LT1963A-1.8/LT1963A-2.5/LT1963A-3.3), IN: Input. Power is supplied to the device through the IN the SENSE pin is the input to the error amplifier. Optimum pin. A bypass capacitor is required on this pin if the device regulation will be obtained at the point where the SENSE is more than six inches away from the main input filter pin is connected to the OUT pin of the regulator. In criti- capacitor. In general, the output impedance of a battery cal applications, small voltage drops are caused by the rises with frequency, so it is advisable to include a bypass resistance (R ) of PC traces between the regulator and the capacitor in battery-powered circuits. A bypass capacitor P load. These may be eliminated by connecting the SENSE in the range of 1µF to 10µF is sufficient. The LT1963A pin to the output at the load as shown in Figure 1 (Kelvin regulators are designed to withstand reverse voltages Sense Connection). Note that the voltage drop across on the IN pin with respect to ground and the OUT pin. In the external PC traces will add to the dropout voltage of the case of a reverse input, which can happen if a battery the regulator. The SENSE pin bias current is 600µA at is plugged in backwards, the device will act as if there is the nominal rated output voltage. The SENSE pin can be a diode in series with its input. There will be no reverse pulled below ground (as in a dual supply system where current flow into the regulator and no reverse voltage the regulator load is returned to a negative supply) and will appear at the load. The device will protect both itself still allow the device to start and operate. and the load. ADJ: Adjust. For the adjustable LT1963A, this is the input IN OUT to the error amplifier. This pin is internally clamped to ±7V. RP LT1963A It has a bias current of 3µA which flows into the pin. The ADJ pin voltage is 1.21V referenced to ground and the VIN + SHDN SENSE + LOAD output voltage range is 1.21V to 20V. GND SHDN: Shutdown. The SHDN pin is used to put the LT1963A RP 1963A F01 regulators into a low power shutdown state. The output will Figure 1. Kelvin Sense Connection 1963aff 13 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion The LT1963A series are 1.5A low dropout regulators opti- mized for fast transient response. The devices are capable IN OUT VOUT + of supplying 1.5A at a dropout voltage of 350mV. The low VIN LT1963A R2  R2 operating quiescent current (1mA) drops to less than 1µA ADJ VOUT=1.21V1+R1+(IADJ)(R2) in shutdown. In addition to the low quiescent current, the GND R1 V =1.21V ADJ LT1963A regulators incorporate several protection features I =3µA AT 25°C ADJ which make them ideal for use in battery-powered systems. 1963A F02 OUTPUT RANGE = 1.21V TO 20V The devices are protected against both reverse input and Figure 2. Adjustable Operation reverse output voltages. In battery backup applications where the output can be held up by a backup battery when make it stable. For the LT1963A, the frequency compensa- the input is pulled to ground, the LT1963A-X acts like it tion is both internal and external—the output capacitor. has a diode in series with its output and prevents reverse The size of the output capacitor, the type of the output current flow. Additionally, in dual supply applications capacitor, and the ESR of the particular output capacitor where the regulator load is returned to a negative supply, all affect the stability. the output can be pulled below ground by as much as 20V In addition to stability, the output capacitor also affects and still allow the device to start and operate. the high frequency transient response. The regulator loop has a finite band width. For high frequency transient Adjustable Operation loads, recovery from a transient is a combination of the The adjustable version of the LT1963A has an output output capacitor and the bandwidth of the regulator. The voltage range of 1.21V to 20V. The output voltage is set LT1963A was designed to be easy to use and accept a by the ratio of two external resistors as shown in Figure wide variety of output capacitors. However, the frequency 2. The device servos the output to maintain the voltage at compensation is affected by the output capacitor and opti- the ADJ pin at 1.21V referenced to ground. The current mum frequency stability may require some ESR, especially in R1 is then equal to 1.21V/R1 and the current in R2 is with ceramic capacitors. the current in R1 plus the ADJ pin bias current. The ADJ For ease of use, low ESR polytantalum capacitors (POSCAP) pin bias current, 3µA at 25°C, flows through R2 into the are a good choice for both the transient response and ADJ pin. The output voltage can be calculated using the stability of the regulator. These capacitors have intrinsic formula in Figure 2. The value of R1 should be less than ESR that improves the stability. Ceramic capacitors have 4.17k to minimize errors in the output voltage caused by extremely low ESR, and while they are a good choice in the ADJ pin bias current. Note that in shutdown the output many cases, placing a small series resistance element is turned off and the divider current will be zero. will sometimes achieve optimum stability and minimize The adjustable device is tested and specified with the ADJ ringing. In all cases, a minimum of 10µF is required while pin tied to the OUT pin for an output voltage of 1.21V. the maximum ESR allowable is 3Ω. Specifications for output voltages greater than 1.21V will The place where ESR is most helpful with ceramics is be proportional to the ratio of the desired output voltage low output voltage. At low output voltages, below 2.5V, to 1.21V: V /1.21V. For example, load regulation for an OUT some ESR helps the stability when ceramic output capaci- output current change of 1mA to 1.5A is –3mV typical at tors are used. Also, some ESR allows a smaller capaci- V = 1.21V. At V = 5V, load regulation is: OUT OUT tor value to be used. When small signal ringing occurs (5V/1.21V)(–3mV) = –12.4mV with ceramics due to insufficient ESR, adding ESR or increasing the capacitor value improves the stability and Output Capacitors and Stability reduces the ringing. Table 1 gives some recommended The LT1963A regulator is a feedback circuit. Like any values of ESR to minimize ringing caused by fast, hard feedback circuit, frequency compensation is needed to current transitions. 1963aff 14 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion Table 1. Capacitor Minimum ESR POSCAP capacitors are used. The output voltage is at the VOUT 10µF 22µF 47µF 100µF worst case value of 1.2V. Trace A, is with a 10µF ceramic 1.2V 20mΩ 15mΩ 10mΩ 5mΩ output capacitor and shows significant ringing with a peak 1.5V 20mΩ 15mΩ 10mΩ 5mΩ amplitude of 25mV. For Trace B, a 22µF/45mΩ POSCAP 1.8V 15mΩ 10mΩ 10mΩ 5mΩ is added in parallel with the 10µF ceramic. The output is 2.5V 5mΩ 5mΩ 5mΩ 5mΩ well damped and settles to within 10mV in less than 20µs. 3.3V 0mΩ 0mΩ 0mΩ 5mΩ For Trace C, a 100µF/35mΩ POSCAP is connected in parallel ≥5V 0mΩ 0mΩ 0mΩ 0mΩ with the 10µF ceramic capacitor. In this case the peak output deviation is less than 20mV and the output settles in about Figures 3 through 8 show the effect of ESR on the transient 10µs. For improved transient response the value of the response of the regulator. These scope photos show the bulk capacitor (tantalum or aluminum electrolytic) should transient response for the LT1963A at three different output be greater than twice the value of the ceramic capacitor. voltages with various capacitors and various values of ESR. The output load conditions are the same for all traces. In Tantalum and Polytantalum Capacitors all cases there is a DC load of 500mA. The load steps up There is a variety of tantalum capacitor types available, to 1A at the first transition and steps back to 500mA at with a wide range of ESR specifications. Older types have the second transition. ESR specifications in the hundreds of mΩ to several Ohms. At the worst case point of 1.2V with 10µF C Some newer types of polytantalum with multi-electrodes OUT OUT (Figure 3), a minimum amount of ESR is required. While have maximum ESR specifications as low as 5mΩ. In gen- 20mΩ is enough to eliminate most of the ringing, a value eral the lower the ESR specification, the larger the size and closer to 50mΩ provides a more optimum response. At the higher the price. Polytantalum capacitors have better 2.5V output with 10µF C (Figure 4) the output rings surge capability than older types and generally lower ESR. OUT at the transitions with 0Ω ESR but still settles to within Some types such as the Sanyo TPE and TPB series have 10mV in 20µs after the 0.5A load step. Once again a small ESR specifications in the 20mΩ to 50mΩ range, which value of ESR will provide a more optimum response. provide near optimum transient response. At 5V with 10µF C (Figure 5) the response is well OUT OUT Aluminum Electrolytic Capacitors damped with 0Ω ESR. Aluminum electrolytic capacitors can also be used with the With a C of 100µF at 0Ω ESR and an output of 1.2V OUT LT1963A. These capacitors can also be used in conjunction (Figure 6), the output rings although the amplitude is with ceramic capacitors. These tend to be the cheapest only 20mV . With C of 100µF it takes only 5mΩ to p-p OUT and lowest performance type of capacitors. Care must be 20mΩ of ESR to provide good damping at 1.2V output. used in selecting these capacitors as some types can have Performance at 2.5V and 5V output with 100µF C shows OUT ESR which can easily exceed the 3Ω maximum value. similar characteristics to the 10µF case (see Figures 7-8). At 2.5V 5mΩ to 20mΩ can improve transient response. OUT Ceramic Capacitors At 5V the response is well damped with 0Ω ESR. OUT Extra consideration must be given to the use of ceramic Capacitor types with inherently higher ESR can be combined capacitors. Ceramic capacitors are manufactured with a with 0mΩ ESR ceramic capacitors to achieve both good variety of dielectrics, each with different behavior over high frequency bypassing and fast settling time. Figure temperature and applied voltage. The most common 9 illustrates the improvement in transient response that dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and can be seen when a parallel combination of ceramic and 1963aff 15 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion VOUT = 1.2V VOUT = 1.2V 0 IOUT = 500mA WITH 0 IOUT = 500mA WITH 500mA PULSE 500mA PULSE COUT = 10µF COUT = 100µF mΩ) 20 50m mΩ) 5 50m R (ESR 50 V/DIV R (ESR 10 V/DIV 100 20 20µs/DIV 1963A F03 50µs/DIV 1963A F06 Figure 3 Figure 6 VOUT = 2.5V VOUT = 2.5V 0 IOUT = 500mA WITH 0 IOUT = 500mA WITH 500mA PULSE 500mA PULSE COUT = 10µF COUT = 100µF mΩ) 20 50m mΩ) 5 50m (SR V/D (SR V/D RE 50 IV RE 10 IV 100 20 20µs/DIV 1963A F04 50µs/DIV 1963A F07 Figure 4 Figure 7 VOUT = 5V VOUT = 5V 0 IOUT = 500mA WITH 0 IOUT = 500mA WITH 500mA PULSE 500mA PULSE COUT = 10µF COUT = 100µF mΩ) 20 50m mΩ) 5 50m (SR V/D (SR V/D RE 50 IV RE 10 IV 100 20 20µs/DIV 1963A F05 50µs/DIV 1963A F08 Figure 5 Figure 8 VOUT = 1.2V A IOUT = 500mA WITH 500mA PULSE COUT = A = 10µF CERAMIC B = 10µF CERAMIC II 22µF/45mΩ POLY mΩ) 50m C = 10µF CERAMIC II 100µF/35mΩ POLY (SR B V/D RE IV C 50µs/DIV 1963A F09 Figure 9 1963aff 16 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion Y5V dielectrics are good for providing high capacitances in “FREE” Resistance with PC Traces a small package, but exhibit strong voltage and temperature The resistance values shown in Table 2 can easily be made coefficients as shown in Figures 10 and 11. When used using a small section of PC trace in series with the output with a 5V regulator, a 10µF Y5V capacitor can exhibit an capacitor. The wide range of non-critical ESR makes it effective value as low as 1µF to 2µF over the operating easy to use PC trace. The trace width should be sized to temperature range. The X5R and X7R dielectrics result in handle the RMS ripple current associated with the load. more stable characteristics and are more suitable for use The output capacitor only sources or sinks current for a few as the output capacitor. The X7R type has better stability microseconds during fast output current transitions. There across temperature, while the X5R is less expensive and is no DC current in the output capacitor. Worst case ripple is available in higher values. current will occur if the output load is a high frequency Voltage and temperature coefficients are not the only (>100kHz) square wave with a high peak value and fast sources of problems. Some ceramic capacitors have a edges (< 1µs). Measured RMS value for this case is 0.5 piezoelectric response. A piezoelectric device generates times the peak-to-peak current change. Slower edges or voltage across its terminals due to mechanical stress, lower frequency will significantly reduce the RMS ripple similar to the way a piezoelectric accelerometer or micro- current in the capacitor. phone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. Table 2. PC Trace Resistors 10mΩ 20mΩ 30mΩ 0.5oz C Width 0.011" (0.28mm) 0.011" (0.28mm) 0.011" (0.28mm) U Length 0.102" (2.6mm) 0.204" (5.2mm) 0.307" (7.8mm) 1.0oz C Width 0.006" (0.15mm) 0.006" (0.15mm) 0.006" (0.15mm) U Length 0.110" (2.8mm) 0.220" (5.6mm) 0.330" (8.4mm) 2.0oz C Width 0.006" (0.15mm) 0.006" (0.15mm) 0.006" (0.15mm) U Length 0.224" (5.7mm) 0.450" (11.4mm) 0.670" (17mm) 20 40 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF 20 0 %) X5R %) 0 X5R E (–20 E ( U U AL AL –20 V V N –40 N E I E I –40 G G Y5V N N A–60 A H H –60 C Y5V C –80 –80 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF –100 –100 0 2 4 6 8 10 12 14 16 –50 –25 0 25 50 75 100 125 DC BIAS VOLTAGE (V) TEMPERATURE (°C) 1963A F10 1963A F11 Figure 10. Ceramic Capacitor DC Bias Characteristics Figure 11. Ceramic Capacitor Temperature Characteristics 1963aff 17 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion This resistor should be made using one of the inner typically 40nV/√Hz over this frequency bandwidth for layers of the PC board which are well defined. The resistiv- the LT1963A (adjustable version). For higher output ity is determined primarily by the sheet resistance of the voltages (generated by using a resistor divider), the copper laminate with no additional plating steps. Table output voltage noise will be gained up accordingly. This 2 gives some sizes for 0.75A RMS current for various results in RMS noise over the 10Hz to 100kHz bandwidth copper thicknesses. More detailed information regarding of 14µV for the LT1963A increasing to 38µV for RMS RMS resistors made from PC traces can be found in Application the LT1963A-3.3. Note 69, Appendix A. Higher values of output voltage noise may be measured when care is not exercised with regard to circuit layout Overload Recovery and testing. Crosstalk from nearby traces can induce Like many IC power regulators, the LT1963A-X has safe op- unwanted noise onto the output of the LT1963A-X. erating area protection. The safe area protection decreases Power supply ripple rejection must also be considered; the the current limit as input-to-output voltage increases and LT1963A regulators do not have unlimited power supply keeps the power transistor inside a safe operating region rejection and will pass a small portion of the input noise for all values of input-to-output voltage. The protection through to the output. is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. Thermal Considerations When power is first turned on, as the input voltage rises, The power handling capability of the device is limited by the the output follows the input, allowing the regulator to start maximum rated junction temperature (125°C). The power up into very heavy loads. During the start-up, as the input dissipated by the device is made up of two components: voltage is rising, the input-to-output voltage differential 1. Output current multiplied by the input/output voltage is small, allowing the regulator to supply large output differential: (I )(V – V ), and OUT IN OUT currents. With a high input voltage, a problem can occur 2. GND pin current multiplied by the input voltage: (I ) wherein removal of an output short will not allow the GND (V ). output voltage to recover. Other regulators, such as the IN LT1085, also exhibit this phenomenon, so it is not unique The GND pin current can be found using the GND Pin to the LT1963A-X. Current curves in the Typical Performance Characteristics. Power dissipation will be equal to the sum of the two The problem occurs with a heavy output load when the components listed above. input voltage is high and the output voltage is low. Common situations are immediately after the removal of a short- The LT1963A series regulators have internal thermal circuit or when the shutdown pin is pulled high after the limiting designed to protect the device during overload input voltage has already been turned on. The load line for conditions. For continuous normal conditions, the maxi- such a load may intersect the output current curve at two mum junction temperature rating of 125°C must not be points. If this happens, there are two stable output operat- exceeded. It is important to give careful consideration to ing points for the regulator. With this double intersection, all sources of thermal resistance from junction to ambi- the input power supply may need to be cycled down to ent. Additional heat sources mounted nearby must also zero and brought up again to make the output recover. be considered. For surface mount devices, heat sinking is accomplished Output Voltage Noise by using the heat spreading capabilities of the PC board The LT1963A regulators have been designed to provide and its copper traces. Copper board stiffeners and plated low output voltage noise over the 10Hz to 100kHz band- through-holes can also be used to spread the heat gener- width while operating at full load. Output voltage noise is ated by power devices. 1963aff 18 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion The following tables list thermal resistance for several The power dissipated by the device will be equal to: different board sizes and copper areas. All measurements I (V – V ) + I (V ) OUT(MAX) IN(MAX) OUT GND IN(MAX) were taken in still air on 1/16" FR-4 board with one ounce copper. where, I = 500mA Table 3. Q Package, 5-Lead DD OUT(MAX) V = 6V COPPER AREA THERMAL RESISTANCE IN(MAX) I at (I = 500mA, V = 6V) = 10mA TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) GND OUT IN 2500mm2 2500mm2 2500mm2 23°C/W So, 1000mm2 2500mm2 2500mm2 25°C/W P = 500mA(6V – 3.3V) + 10mA(6V) = 1.41W 125mm2 2500mm2 2500mm2 33°C/W Using a DD package, the thermal resistance will be in the *Device is mounted on topside range of 23°C/W to 33°C/W depending on the copper area. So the junction temperature rise above ambient will Table 4. S0-8 Package, 8-Lead SO be approximately equal to: COPPER AREA THERMAL RESISTANCE TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) 1.41W(28°C/W) = 39.5°C 2500mm2 2500mm2 2500mm2 55°C/W The maximum junction temperature will then be equal to 1000mm2 2500mm2 2500mm2 55°C/W the maximum junction temperature rise above ambient 225mm2 2500mm2 2500mm2 63°C/W plus the maximum ambient temperature or: 125mm2 2500mm2 2500mm2 69°C/W *Device is mounted on topside TJMAX = 50°C + 39.5°C = 89.5°C Table 5. SOT-223 Package, 3-Lead SOT-223 Protection Features COPPER AREA THERMAL RESISTANCE The LT1963A regulators incorporate several protection TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) features which make them ideal for use in battery-powered 2500mm2 2500mm2 2500mm2 42°C/W circuits. In addition to the normal protection features 1000mm2 2500mm2 2500mm2 42°C/W associated with monolithic regulators, such as current 225mm2 2500mm2 2500mm2 50°C/W limiting and thermal limiting, the devices are protected 100mm2 2500mm2 2500mm2 56°C/W against reverse input voltages, reverse output voltages 1000mm2 1000mm2 1000mm2 49°C/W and reverse voltages from output to input. 1000mm2 0mm2 1000mm2 52°C/W Current limit protection and thermal overload protection *Device is mounted on topside are intended to protect the device against current overload T Package, 5-Lead TO-220 conditions at the output of the device. For normal opera- Thermal Resistance (Junction-to-Case) = 4°C/W tion, the junction temperature should not exceed 125°C. Calculating Junction Temperature The input of the device will withstand reverse voltages of 20V. Current flow into the device will be limited to less Example: Given an output voltage of 3.3V, an input volt- than 1mA (typically less than 100µA) and no negative age range of 4V to 6V, an output current range of 0mA voltage will appear at the output. The device will protect to 500mA and a maximum ambient temperature of 50°C, both itself and the load. This provides protection against what will the maximum junction temperature be? batteries that can be plugged in backward. 1963aff 19 For more information www.linear.com/LT1963A

LT1963A Series applicaTions inForMaTion The output of the LT1963A can be pulled below ground In circuits where a backup battery is required, several without damaging the device. If the input is left open circuit different input/output conditions can occur. The output or grounded, the output can be pulled below ground by voltage may be held up while the input is either pulled 20V. For fixed voltage versions, the output will act like a to ground, pulled to some intermediate voltage, or is left large resistor, typically 5k or higher, limiting current flow open circuit. Current flow back into the output will follow to typically less than 600µA. For adjustable versions, the the curve shown in Figure 12. output will act like an open circuit; no current will flow out When the IN pin of the LT1963A is forced below the OUT of the pin. If the input is powered by a voltage source, the pin or the OUT pin is pulled above the IN pin, input cur- output will source the short-circuit current of the device rent will typically drop to less than 2µA. This can happen and will protect itself by thermal limiting. In this case, if the input of the device is connected to a discharged grounding the SHDN pin will turn off the device and stop (low voltage) battery and the output is held up by either the output from sourcing the short-circuit current. a backup battery or a second regulator circuit. The state The ADJ pin of the adjustable device can be pulled above of the SHDN pin will have no effect on the reverse output or below ground by as much as 7V without damaging the current when the output is pulled above the input. device. If the input is left open circuit or grounded, the ADJ pin will act like an open circuit when pulled below ground and like a large resistor (typically 5k) in series with a diode 5.0 LT1963A when pulled above ground. 4.5 VOUT = VADJ A) m 4.0 LT1963A-1.5 In situations where the ADJ pin is connected to a resistor NT ( 3.5 VOUT = VFB divider that would pull the ADJ pin above its 7V clamp volt- URRE 3.0 LTV1O9U6T3 =A -V1F.8B C age if the output is pulled high, the ADJ pin input current PUT 2.5 LTV1O9U6T3 =A -V2F.5B must be limited to less than 5mA. For example, a resistor UT 2.0 O LT1963A-3.3 divider is used to provide a regulated 1.5V output from the SE 1.5 VOUT = VFB R 1.21V reference when the output is forced to 20V. The top VE 1.0 TJ = 25°C RE VIN = 0V resistor of the resistor divider must be chosen to limit the 0.5 CURRENT FLOWS INTO OUTPUT PIN current into the ADJ pin to less than 5mA when the ADJ 0 0 1 2 3 4 5 6 7 8 9 10 pin is at 7V. The 13V difference between OUT and ADJ OUTPUT VOLTAGE (V) 1963A F12 pins divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 2.6k. Figure 12. Reverse Output Current 1963aff 20 For more information www.linear.com/LT1963A

LT1963A Series Typical applicaTions SCR Pre-Regulator Provides Efficiency Over Line Variations L1 500µH LT1963A-3.3 IN OUT 3.3VOUT L2 1N4148 + + 1.5A 10VAC AT 10000µF SHDN FB 22µF 115VIN GND 1k 90-140 VAC 34k* 10VAC AT 115VIN 1N4002 1N4002 12.1k* +V “SYNC” 1N4002 2.4k TO ALL “+V” + C1A 200k POINTS + 1N4148 1/2 22µF 750Ω LT1018 – 0.1µF +V C1B 750Ω + +V 0.033µF 1/2 A1 + LT1018 1N4148 – LT1006 10k 10k – +V 10k 1µF +V L1 = COILTRONICS CTX500-2-52 LT1004 L2 = STANCOR P-8559 1.2V * = 1% FILM RESISTOR = NTE5437 1963A TA03 Paralleling of Regulators for Higher Output Current R1, 0.01Ω LT1963A-3.3 3.3V + IN OUT + 3A VIN > 3.7V C1010µF SHDN FB C222µF GND R2 0.01Ω LT1963A IN OUT R6 6.65k SHDN SHDN FB GND R7 4.12k R3 R4 R5 2.2k 2.2k 1k 3 + 8 1/2 1 LT1366 2 – 4 C3 0.01µF 1963A TA05 1963aff 21 For more information www.linear.com/LT1963A

LT1963A Series pacKage DescripTion Q Package 5-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1461 Rev F) .060 (1.524) .390 – .415 .256 .060 TYP (9.906 – 10.541) .165 – .180 (6.502) (1.524) (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP +.008 .004 (1.0.56204) (4.1.68438) .330 – .370 (1.0.45999) ( +–0.0.20043) (8.382 – 9.398) 0.102 TYP –0.102 .095 – .115 (2.413 – 2.921) .075 (1.905) DETAIL A .067 .050 ±.012 .300 .143+.012 (1.702) .013 – .023 (1.270 ±0.305) (7.620) –.020 BSC (0.330 – 0.584) ( +0.305) .028 – .038 BOTTOM VIEW OF DD PAK 3.632–0.508 (0.711 – 0.965) HATCHED AREA IS SOLDER PLATED TYP COPPER HEAT SINK DETAIL A 0° – 7° TYP 0° – 7° TYP .420 .080 .420 .276 .350 .325 .205 .585 .585 .320 .090 .090 .067 .042 .067 .042 RECOMMENDED SOLDER PAD LAYOUT RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) Q(DD5) 0811 REV F 2. DRAWING NOT TO SCALE 1963aff 22 For more information www.linear.com/LT1963A

LT1963A Series pacKage DescripTion S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 .045 ±.005 (4.801 – 5.004) .050 BSC NOTE 3 8 7 6 5 .245 MIN .160 ±.005 .150 – .157 .228 – .244 (3.810 – 3.988) (5.791 – 6.197) NOTE 3 .030 ±.005 TYP 1 2 3 4 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45°(cid:29) .053 – .069 (0.254 – 0.508) (1.346 – 1.752) .004 – .010 .008 – .010 (0.203 – 0.254) 0°– 8° TYP (0.101 – 0.254) .016 – .050 .014 – .019 .050 (0.406 – 1.270) (0.355 – 0.483) (1.270) NOTE: INCHES TYP BSC 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) SO8 0303 1963aff 23 For more information www.linear.com/LT1963A

LT1963A Series pacKage DescripTion ST Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – .264 .129 MAX (6.30 – 6.71) .114 – .124 .059 MAX (2.90 – 3.15) .264 – .287 .248 BSC (6.70 – 7.30) .130 – .146 (3.30 – 3.71) .039 MAX .059 MAX .090 BSC .181 MAX .0905 .033 – .041 RECOMMENDED SOLDER PAD LAYOUT (2.30) (0.84 – 1.04) BSC 10° – 16° .010 – .014 .071 10° (0.25 – 0.36) (1.80) MAX MAX 10° – 16° .024 – .033 .0008 – .0040 .012 (0.60 – 0.84) (0.31) (0.0203 – 0.1016) .181 MIN (4.60) ST3 (SOT-233) 0502 BSC 1963aff 24 For more information www.linear.com/LT1963A

LT1963A Series pacKage DescripTion T Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421) .147 – .155 .165 – .180 .390 – .415 (3.734 – 3.937) (4.191 – 4.572) .045 – .055 (9.906 – 10.541) DIA (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .570 – .620 .620 .460 – .500 (14.478 – 15.748) (15.75) (11.684 – 12.700) .330 – .370 TYP .700 – .728 (8.382 – 9.398) (17.78 – 18.491) .095 – .115 SEATING PLANE (2.413 – 2.921) .152 – .202 .260 – .320 (3.861 – 5.131) .155 – .195* (3.937 – 4.953) (6.60 – 8.13) .013 – .023 (0.330 – 0.584) .067 BSC .028 – .038 .135 – .165 (1.70) (0.711 – 0.965) (3.429 – 4.191) * MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 1963aff 25 For more information www.linear.com/LT1963A

LT1963A Series pacKage DescripTion FE Package 16-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663 Rev J) Exposed Pad Variation BB 4.70 DETAIL A (.185) 4.90 – 5.10* 3.58 (.193 – .201) 0.56 (.141) (.022) 3.58 REF (.141) NOTE 5 0.53 16 151413121110 9 (.021) NOTE 5 REF DETAIL A IS THE PART OF THE 6.60 ±0.10 2.94 3.05 LEAD FRAM FEATURE FOR 4.50 ±0.10 (.116)(.120) DETAIL A RNEOF MEREEANSCUER OEMNLEYNT PUROSE SEE NOTE 4 2.94 6.40 (.116) (.252) BSC 1.05 ±0.10 0.65 BSC 0.45 ±0.05 RECOMMENDED SOLDER PAD LAYOUT 1 2 3 4 5 6 7 8 1.10 4.30 – 4.50* (.0433) (.169 – .177) 0.25 MAX REF 0° – 8° 0.65 0.09 – 0.20 0.50 – 0.75 (.0256) 0.05 – 0.15 (.0035 – .0079) (.020 – .030) BSC (.002 – .006) 0.195 – 0.30 (.0077 – .0118) FE16 (BB) TSSOP REV J 1012 TYP NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 5. BOTTOM EXPOSED PADDLE MAY HAVE METAL PROTRUSION MILLIMETERS IN THIS AREA. THIS REGION MUST BE FREE OF ANY EXPOSED 2. DIMENSIONS ARE IN (INCHES) TRACES OR VIAS ON PBC LAYOUT 3. DRAWING NOT TO SCALE *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT 1963aff 26 For more information www.linear.com/LT1963A

LT1963A Series revision hisTory (Revision history begins at Rev E) REV DATE DESCRIPTION PAGE NUMBER E 02/11 Updated FE and Q package drawings in Package Description section 22, 26 F 09/13 Replaced graphs with correct versions 16 1963aff Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 27 However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconneFcotior nm oof irtse ciinrcfouirtms aast dioensc wribwedw h.leinreeina rw.cilol nmot/ LinTf1ri9ng6e3 oAn existing patent rights.

LT1963A Series Typical applicaTion Adjustable Current Source R5 0.01Ω LT1963A-1.8 IN OUT LOAD + R1 VIN > 2.7V 10Cµ1F 1k SHDN FB LT1004-1.2 GND R2 R4 R6 C3 R8 80.6k 2.2k 2.2k 1µF 100k R3 2k R7 2 + 8 470Ω 1/2 1 LT1366 3 – 4 C2 NOTE: ADJUST R1 FOR 3.3µF 0A TO 1.5A CONSTANT CURRENT 1963A TA04 relaTeD parTs PART NUMBER DESCRIPTION COMMENTS LT1175 500mA, Micropower, Negative LDO V : –20V to –4.3V, V = –3.8V, V = 0.50V, I = 45µA, I 10µA, IN OUT(MIN) DO Q SD DD, SOT-223, PDIP8 Packages LT1185 3A, Negative LDO V : –35V to –4.2V, V = –2.40V, V = 0.80V, I = 2.5mA, I <1µA, IN OUT(MIN) DO Q SD TO220-5 Package LT1761 100mA, Low Noise Micropower, LDO V : 1.8V to 20V, V = 1.22V, V = 0.30V, I = 20µA, I <1µA IN OUT(MIN) DO Q SD ThinSOT™ Package LT1762 150mA, Low Noise Micropower, LDO V : 1.8V to 20V, V = 1.22V, V = 0.30V, I = 25µA, I <1µA, MS8 Package IN OUT(MIN) DO Q SD LT1763 500mA, Low Noise Micropower, LDO V : 1.8V to 20V, V = 1.22V, V = 0.30V, I = 30µA, I <1µA, S8 Package IN OUT(MIN) DO Q SD LT1764/ 3A, Low Noise, Fast Transient Response, V : 2.7V to 20V, V = 1.21V, V = 0.34V, I = 1mA, I <1µA, IN OUT(MIN) DO Q SD LT1764A LDO DD, TO220 Packages LTC1844 150mA, Very Low Drop-Out LDO V : 6.5V to 1.6V, V = 1.25V, V = 0.08V, I = 40µA, I < 1µA, IN OUT(MIN) DO Q SD ThinSOT Package LT1962 300mA, Low Noise Micropower, LDO V : 1.8V to 20V, V = 1.22V, V = 0.27V, I = 30µA, I <1µA, MS8 Package IN OUT(MIN) DO Q SD LT1964 200mA, Low Noise Micropower, V : –0.9V to –20V, V = –1.21V, V = 0.34V, I = 30µA, I 3µA, IN OUT(MIN) DO Q SD Negative LDO ThinSOT Package LT1965 1.1A, Low Noise, Low Dropout Linear 290mV Dropout Voltage, Low Noise: 40µV , V : 1.8V to 20V, V : 1.2V to 19.5V, RMS IN OUT Regulator stable with ceramic caps, TO-220, DD-Pak, MSOP and 3mm × 3mm DFN Packages LT3020 100mA, Low Voltage V V : 0.9V to 10V, V = 0.20, V = 0.15V, I = 120µA, I <3µA, LDO, IN OUT(MIN) DO Q SD V = 0.9V DFN, MS8 Packages IN(MIN) LT3023 Dual, 2x 100mA, Low Noise V : 1.8V to 20V, V = 1.22V, V = 0.30V, I = 40µA, I <1µA, IN OUT(MIN) DO Q SD Micropower, LDO DFN, MS10 Packages LT3024 Dual, 100mA/500mA, Low Noise V : 1.8V to 20V, V = 1.22V, V = 0.30V, I = 60µA, I <1µA, IN OUT(MIN) DO Q SD Micropower, LDO DFN, TSSOP Packages LT3080/ 1.1A, Parallelable, Low Noise, Low 300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV , V : 1.2V to 36V, RMS IN LT3080-1 Dropout Linear Regulator V : 0V to 35.7V, current-based reference with 1-resistor V set; directly parallelable OUT OUT (no op amp required), stable with ceramic caps, TO-220, SOT-223, MSOP and 3mm × 3mm DFN Packages; “–1” version has integrated internal ballast resistor 1963aff 28 Linear Technology Corporation LT 0913 REV F • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1963A (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT1963A  LINEAR TECHNOLOGY CORPORATION 2005

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT1963AEQ-3.3#PBF LT1963AIQ#PBF LT1963AES8-1.5 LT1963AET-2.5#06PBF LT1963AET#06PBF LT1963AET-1.8#30 LT1963AEFE-1.8#TRPBF LT1963AEQ-2.5#TR LT1963AEST-1.5 LT1963AES8-3.3#PBF LT1963AES8-1.5#TRPBF LT1963AEST-1.8#TRPBF LT1963AMPQ#PBF LT1963AES8-1.8#TR LT1963AEFE LT1963AEQ-1.5 LT1963AET-3.3#30 LT1963AEST-2.5#TR LT1963AEQ-1.8#TR LT1963AES8 LT1963AET- 3.3#30PBF LT1963AEFE-1.8 LT1963AEFE#PBF LT1963AIS8#PBF LT1963AEFE-3.3#PBF LT1963AEST-2.5 LT1963AET-3.3 LT1963AES8-3.3#TR LT1963AET#PBF LT1963AEST-2.5#TRPBF LT1963AET-2.5#06 LT1963AEQ- 1.8 LT1963AIS8#TRPBF LT1963AEQ-1.8#TRPBF LT1963AEQ-3.3#TR LT1963AIQ LT1963AET-1.5#PBF LT1963AEFE-1.8#TR LT1963AEST-1.8 LT1963AEST-1.5#PBF LT1963AEST-3.3#TR LT1963AEQ#PBF LT1963AES8-1.8#TRPBF LT1963AET-1.8#30PBF LT1963AEFE-1.5#PBF LT1963AEFE-3.3#TR LT1963AET- 3.3#PBF LT1963AES8#TR LT1963AES8#PBF LT1963AMPQ LT1963AET-1.8 LT1963AEQ-2.5 LT1963AEST-3.3 LT1963AEQ-2.5#TRPBF LT1963AES8-2.5 LT1963AET-1.8#PBF LT1963AEQ#TR LT1963AES8-1.5#PBF LT1963AEFE-2.5 LT1963AIT#PBF LT1963AEST-3.3#TRPBF LT1963AES8-2.5#TRPBF LT1963AEQ-1.8#PBF LT1963AEFE-2.5#TR LT1963AMPQ#TR LT1963AEFE-3.3 LT1963AEST-3.3#PBF LT1963AEFE-1.8#PBF LT1963AET-1.5 LT1963AEQ-3.3#TRPBF LT1963AET-3.3#06PBF LT1963AEFE#TR LT1963AEST-1.5#TRPBF LT1963AET-1.8#06PBF LT1963AES8-2.5#PBF LT1963AEST-1.8#TR LT1963AIFE#TRPBF LT1963AIFE#PBF LT1963AES8-3.3#TRPBF LT1963AET-2.5 LT1963AMPS8 LT1963AEQ-1.5#TR LT1963AES8-3.3 LT1963AEST- 2.5#PBF LT1963AEFE-1.5 LT1963AET-1.8#06 LT1963AES8-1.5#TR LT1963AMPS8#PBF LT1963AET LT1963AEQ#TRPBF LT1963AET-2.5#PBF LT1963AEFE-2.5#PBF LT1963AEQ-3.3 LT1963AEQ LT1963AEFE- 2.5#TRPBF LT1963AES8-2.5#TR LT1963AEST-1.5#TR LT1963AEFE#TRPBF LT1963AES8-1.8#PBF LT1963AEFE-1.5#TRPBF