LT1460 Micropower Precision Series Reference Family Features Description n Trimmed to High Accuracy: 0.075% Max The LT®1460 is a micropower bandgap reference that n Low Drift: 10ppm/°C Max combines very high accuracy and low drift with low power n Industrial Temperature Range dissipation and small package size. This series reference n Temperature Coefficient Guaranteed to 125°C uses curvature compensation to obtain low temperature n Low Supply Current: 130µA Max (LT1460-2.5) coefficient and trimmed precision thin-film resistors to n Minimum Output Current: 20mA achieve high output accuracy. The reference will supply n No Output Capacitor Required up to 20mA with excellent line regulation characteristics, n Reverse Battery Protection making it ideal for precision regulator applications. n Minimum Input/Output Differential: 0.9V This series reference provides supply current and power n Available in S0-8, MSOP-8, PDIP-8, TO-92 and dissipation advantages over shunt references that must idle SOT- 23 Package the entire load current to operate. Additionally, the LT1460 does not require an output compensation capacitor, yet applications is stable with capacitive loads. This feature is important where PC board space is a premium or fast settling is n Handheld Instruments demanded. In the event of a reverse battery connection, n Precision Regulators these references will not conduct current, and are therefore n A/D and D/A Converters protected from damage. n Power Supplies n Hard Disk Drives The LT1460 is available in the 8-lead MSOP, SO, PDIP and the 3-lead TO-92 and SOT23 packages. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. typical application Typical Distribution of Output Voltage Basic Connection S8 Package 20 LT1460-2.5 18 1400 PARTS 3.4V FROM 2 RUNS IN OUT 2.5V TO 20V 16 C1 GND 14 0.1µF 1460 TA01 %) 12 S ( 10 T NI U 8 6 4 2 0 –0.10 –0.06 –0.02 0 0.02 0.06 0.10 OUTPUT VOLTAGE ERROR (%) 1460 TA02 1460fc 

LT1460 absolute MaxiMuM ratings (Note 1) Input Voltage .............................................................30V Specified Temperature Range (Note 10) Reverse Voltage ......................................................–15V Commercial (C) ........................................0°C to 70°C Output Short-Circuit Duration, T = 25°C Industrial (I) .........................................–40°C to 85°C A V > 10V ............................................................5 sec High (H) .............................................–40°C to 125°C IN V ≤ 10V .....................................................Indefinite Storage Temperature Range (Note 2) .....–65°C to 150°C IN Lead Temperature (Soldering, 10 sec)...................300°C pin conFiguration TOP VIEW IN 1 3 GND OUT 2 S3 PACKAGE 3-LEAD PLASTIC SOT-23 TJMAX = 125°C, θJA = 228°C/W TOP VIEW TOP VIEW DNC* 1 8 DNC* DNC* 1 8 DNC* VIN 2 7 DNC* VIN 2 7 DNC* DNC* 3 6 VOUT DNC* 3 6 VOUT GND 4 5 DNC* GND 4 5 DNC* N8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SO *CONNECTED INTERNALLY. *CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS TJMAX = 150°C, θJA = 130°C/W TJMAX = 150°C, θJA = 190°C/W TOP VIEW BOTTOM VIEW DNC* 1 8 DNC* 1 2 3 VIN 2 7 DNC* DNC* 3 6 VOUT VIN VOUT GND GND 4 5 DNC* MS8 PACKAGE 8-LEAD PLASTIC MSOP *CONNECTED INTERNALLY. Z PACKAGE DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS 3-LEAD TO-92 PLASTIC TJMAX = 150°C, θJA = 250°C/W TJMAX = 150°C, θJA = 160°C/W 1460fc 

LT1460 orDer inForMation Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1460HCS3-2.5#TRMPBF LT1460HCS3-2.5#TRMPBF LTAC or LTH8† 3-Lead Plastic SOT-23 0°C to 70°C LT1460JCS3-2.5#TRMPBF LT1460JCS3-2.5#TRPBF LTAD or LTH8† 3-Lead Plastic SOT-23 0°C to 70°C LT1460KCS3-2.5#TRMPBF LT1460KCS3-2.5#TRPBF LTAE or LTH8† 3-Lead Plastic SOT-23 0°C to 70°C LT1460HCS3-3#TRMPBF LT1460HCS3-3#TRPBF LTAN or LTH9† 3-Lead Plastic SOT-23 0°C to 70°C LT1460JCS3-3#TRMPBF LT1460JCS3-3#TRPBF LTAP or LTH9† 3-Lead Plastic SOT-23 0°C to 70°C LT1460KCS3-3#TRMPBF LT1460KCS3-3#TRPBF LTAQ or LTH9† 3-Lead Plastic SOT-23 0°C to 70°C LT1460HCS3-3.3#TRMPBF LT1460HCS3-3.3#TRPBF LTAR or LTJ1† 3-Lead Plastic SOT-23 0°C to 70°C LT1460JCS3-3.3#TRMPBF LT1460JCS3-3.3#TRPBF LTAS or LTJ1† 3-Lead Plastic SOT-23 0°C to 70°C LT1460KCS3-3.3#TRMPBF LT1460KCS3-3.3#TRPBF LTAT or LTJ1† 3-Lead Plastic SOT-23 0°C to 70°C LT1460HCS3-5#TRMPBF LT1460HCS3-5#TRPBF LTAK or LTJ2† 3-Lead Plastic SOT-23 0°C to 70°C LT1460JCS3-5#TRMPBF LT1460JCS3-5#TRPBF LTAL or LTJ2† 3-Lead Plastic SOT-23 0°C to 70°C LT1460KCS3-5#TRMPBF LT1460KCS3-5#TRPBF LTAM or LTJ2† 3-Lead Plastic SOT-23 0°C to 70°C LT1460HCS3-10#TRMPBF LT1460HCS3-10#TRPBF LTAU or LTJ3† 3-Lead Plastic SOT-23 0°C to 70°C LT1460JCS3-10#TRMPBF LT1460JCS3-10#TRPBF LTAV or LTJ3† 3-Lead Plastic SOT-23 0°C to 70°C LT1460KCS3-10#TRMPBF LT1460KCS3-10#TRPBF LTAW or LTJ3† 3-Lead Plastic SOT-23 0°C to 70°C TRM = 500 pieces. *Temperature grades and parametric grades are identified by a label on the shipping container. †Product grades are identified with either part marking. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. 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/ LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1460ACN8-2.5#PBF LT1460ACN8-2.5#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460BIN8-2.5#PBF LT1460BIN8-2.5#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460DCN8-2.5#PBF LT1460DCN8-2.5#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460EIN8-2.5#PBF LT1460EIN8-2.5#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460ACN8-5#PBF LT1460ACN8-5#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460BIN8-5#PBF LT1460BIN8-5#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460DCN8-5#PBF LT1460DCN8-5#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460EIN8-5#PBF LT1460EIN8-5#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460ACN8-10#PBF LT1460ACN8-10#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460BIN8-10#PBF LT1460BIN8-10#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460DCN8-10#PBF LT1460DCN8-10#TRPBF 8-Lead Plastic DIP 0°C to 70°C LT1460EIN8-10#PBF LT1460EIN8-10#TRPBF 8-Lead Plastic DIP –40°C to 85°C LT1460ACS8-2.5#PBF LT1460ACS8-2.5#TRPBF 1460A2 8-Lead Plastic SO 0°C to 70°C LT1460BIS8-2.5#PBF LT1460BIS8-2.5#TRPBF 460BI2 8-Lead Plastic SO –40°C to 85°C LT1460DCS8-2.5#PBF LT1460DCS8-2.5#TRPBF 1460D2 8-Lead Plastic SO 0°C to 70°C LT1460EIS8-2.5#PBF LT1460EIS8-2.5#TRPBF 460EI2 8-Lead Plastic SO –40°C to 85°C LT1460LHS8-2.5#PBF LT1460LHS8-2.5#TRPBF 60LH25 8-Lead Plastic SO 0°C to 70°C LT1460MHS8-2.5#PBF LT1460MHS8-2.5#TRPBF 60MH25 8-Lead Plastic SO –40°C to 85°C LT1460ACS8-5#PBF LT1460ACS8-5#TRPBF 1460A5 8-Lead Plastic SO 0°C to 70°C LT1460BIS8-5#PBF LT1460BIS8-5#TRPBF 460BI5 8-Lead Plastic SO –40°C to 85°C 1460fc 

LT1460 orDer inForMation LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1460DCS8-5#PBF LT1460DCS8-5#TRPBF 1460D5 8-Lead Plastic SO 0°C to 70°C LT1460EIS8-5#PBF LT1460EIS8-5#TRPBF 460EI5 8-Lead Plastic SO –40°C to 85°C LT1460LHS8-5#PBF LT1460LHS8-5#TRPBF 460LH5 8-Lead Plastic SO 0°C to 70°C LT1460MHS8-5#PBF LT1460MHS8-5#TRPBF 460MH5 8-Lead Plastic SO –40°C to 85°C LT1460ACS8-10#PBF LT1460ACS8-10#TRPBF 1460A1 8-Lead Plastic SO 0°C to 70°C LT1460BIS8-10#PBF LT1460BIS8-10#TRPBF 460BI1 8-Lead Plastic SO –40°C to 85°C LT1460DCS8-10#PBF LT1460DCS8-10#TRPBF 1460D1 8-Lead Plastic SO 0°C to 70°C LT1460EIS8-10#PBF LT1460EIS8-10#TRPBF 460EI1 8-Lead Plastic SO –40°C to 85°C LT1460CCMS8-2.5#PBF LT1460CCMS8-2.5#TRPBF LTAA 8-Lead Plastic MSOP 0°C to 70°C LT1460FCMS8-2.5#PBF LT1460FCMS8-2.5#TRPBF LTAB 8-Lead Plastic MSOP 0°C to 70°C LT1460CCMS8-5#PBF LT1460CCMS8-5#TRPBF LTAF 8-Lead Plastic MSOP 0°C to 70°C LT1460FCMS8-5#PBF LT1460FCMS8-5#TRPBF LTAG 8-Lead Plastic MSOP 0°C to 70°C LT1460CCMS8-10#PBF LT1460CCMS8-10#TRPBF LTAH 8-Lead Plastic MSOP 0°C to 70°C LT1460FCMS8-10#PBF LT1460FCMS8-10#TRPBF LTAJ 8-Lead Plastic MSOP 0°C to 70°C LT1460GCZ-2.5#PBF LT1460GCZ-2.5#TRPBF 3-Lead Plastic TO-92 0°C to 70°C LT1460GIZ-2.5#PBF LT1460GIZ-2.5#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C LT1460GCZ-5#PBF LT1460GCZ-5#TRPBF 3-Lead Plastic TO-92 0°C to 70°C LT1460GIZ-5#PBF LT1460GIZ-5#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C LT1460GCZ-10#PBF LT1460GCZ-10#TRPBF 3-Lead Plastic TO-92 0°C to 70°C LT1460GIZ-10#PBF LT1460GIZ-10#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. 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/ available options TEMPERATURE PACKAGE TYPE ACCURACY COEFFICIENT TEMPERATURE (%) (ppm/°C) N8 S8 MS8 Z S3 0°C to 70°C 0.075 10 LT1460ACN8 LT1460ACS8 –40°C to 85°C 0.10 10 LT1460BIN8 LT1460BIS8 0°C to 70°C 0.10 15 LT1460CCMS8 0°C to 70°C 0.10 20 LT1460DCN8 LT1460DCS8 –40°C to 85°C 0.125 20 LT1460EIN8 LT1460EIS8 0°C to 70°C 0.15 25 LT1460FCMS8 0°C to 70°C 0.25 25 LT1460GCZ –40°C to 85°C 0.25 25 LT1460GIZ –40°C to 85°C/125°C 0.20 20/50 LT1460LHS8 –40°C to 125°C 0.20 50 LT1460MHS8 0°C to 70°C 0.20 20 LT1460HCS3 0°C to 70°C 0.40 20 LT1460JCS3 0°C to 70°C 0.50 50 LT1460KCS3 1460fc 

LT1460 electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = V + 2.5V, I = 0 unless otherwise specified. A IN OUT OUT PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage LT1460ACN8-2.5, ACS8-2.5 2.49813 2.50188 V –0.075 0.075 % LT1460BIN8-2.5, BIS8-2.5, CCMS8-2.5, 2.4975 2.5025 V DCN8-2.5, DCS8-2.5 –0.10 0.10 % LT1460EIN8-2.5, EIS8-2.5 2.49688 2.50313 V –0.125 0.125 % LT1460FCMS8-2.5 2.49625 2.50375 V –0.15 0.15 % LT1460GCZ-2.5, GIZ-2.5 2.49375 2.50625 V –0.25 0.25 % LT1460LHS8-2.5, MHS8-2.5 2.495 2.505 V –0.20 0.20 % LT1460ACN8-5, ACS8-5 4.99625 5.00375 V –0.075 0.075 % LT1460BIN8-5, BIS8-5, CCMS8-5, 4.995 5.005 V DCN8-5, DCS8-5 –0.10 0.10 % LT1460EIN8-5, EIS8-5 4.99375 5.00625 V –0.125 0.125 % LT1460FCMS8-5 4.9925 5.0075 V –0.15 0.15 % LT1460GCZ-5, GIZ-5 4.9875 5.0125 V –0.25 0.25 % LT1460LHS8-5, MHS8-5 4.990 5.010 V –0.20 0.20 % LT1460ACN8-10, ACS8-10 9.9925 10.0075 V –0.075 0.075 % LT1460BIN8-10, BIS8-10, CCMS8-10, 9.990 10.010 V DCN8-10, DCS8-10 –0.10 0.10 % LT1460EIN8-10, EIS8-10 9.9875 10.0125 V –0.125 0.125 % LT1460FCMS8-10 9.985 10.0015 V –0.15 0.15 % LT1460GCZ-10, GIZ-10 9.975 10.025 V –0.25 0.25 % LT1460HC –0.2 0.2 % LT1460JC –0.4 0.4 % LT1460KC –0.5 0.5 % Output Voltage Temperature Coefficient (Note 3) T ≤ T ≤ T MIN J MAX LT1460ACN8, ACS8, BIN8, BIS8 l 5 10 ppm/°C LT1460CCMS8 l 7 15 ppm/°C LT1460DCN8, DCS8, EIN8, EIS8 l 10 20 ppm/°C LT1460FCMS8, GCZ, GIZ l 12 25 ppm/°C LT1460LHS8 –40°C to 85°C l 10 20 ppm/°C –40°C to 125°C l 25 50 ppm/°C LT1460MHS8 –40°C to 125°C l 25 50 ppm/°C LT1460HC l 10 20 ppm/°C LT1460JC l 10 20 ppm/°C LT1460KC l 25 50 ppm/°C 1460fc 

LT1460 electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = V + 2.5V, I = 0 unless otherwise specified. A IN OUT OUT PARAMETER CONDITIONS MIN TYP MAX UNITS Line Regulation V + 0.9V ≤ V ≤ V + 2.5V 30 60 ppm/V OUT IN OUT LT1460A, LT1460B, LT1460C, LT1460D, LT1460E, l 80 ppm/V LT1460F, LT1460G, LT1460H, LT1460L, LT1460M V + 2.5V ≤ V ≤ 20V 10 25 ppm/V OUT IN l 35 ppm/V LT1460HC, LT1460JC, LT1460KC V + 0.9V ≤ V ≤ V + 2.5V 150 800 ppm/V OUT IN OUT l 1000 ppm/V V + 2.5V ≤ V ≤ 20V 50 100 ppm/V OUT IN l 130 ppm/V Load Regulation Sourcing (Note 4) I = 100µA 1500 2800 ppm/mA OUT LT1460A, LT1460B, LT1460C, LT1460D, LT1460E, l 3500 ppm/mA LT1460F, LT1460G, LT1460H, LT1460L, LT1460M I = 10mA 80 135 ppm/mA OUT l 180 ppm/mA I = 20mA 70 100 ppm/mA OUT 0°C to 70°C l 140 ppm/mA LT1460HC, LT1460JC, LT1460KC I = 100µA 1000 3000 ppm/mA OUT l 4000 ppm/mA I = 10mA 50 200 ppm/mA OUT l 300 ppm/mA I = 20mA 20 70 ppm/mA OUT l 100 ppm/mA Thermal Regulation (Note 5) ΔP = 200mW 0.5 2.5 ppm/mW LT1460A, LT1460B, LT1460C, LT1460D, LT1460E, LT1460F, LT1460G, LT1460H, LT1460L, LT1460M LT1460HC, LT1460JC, LT1460KC ΔP = 200mW 2.5 10 ppm/mW Dropout Voltage (Note 6) V – V , I = 0 l 0.9 V IN OUT OUT V – V , I = 10mA 1.3 V IN OUT OUT l 1.4 V Output Current Short V to GND 40 mA OUT Reverse Leakage V = –15V l 0.5 10 µA IN Supply Current LT1460-2.5 100 130 µA l 165 µA LT1460-5 125 175 µA l 225 µA LT1460-10 190 270 µA l 360 µA LT1460S3-2.5 115 145 µA l 175 µA LT1460S3-3 145 180 µA l 220 µA LT1460S3-3.3 145 180 µA l 220 µA LT1460S3-5 160 200 µA l 240 µA LT1460S3-10 215 270 µA l 350 µA 1460fc 

LT1460 electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = V + 2.5V, I = 0 unless otherwise specified. A IN OUT OUT PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Noise (Note 7) LT1460-2.5 0.1Hz ≤ f ≤ 10Hz 10 µV P-P LT1460A, LT1460B, LT1460C, LT1460D, LT1460E, 10Hz ≤ f ≤ 1kHz 10 µV RMS LT1460F, LT1460G, LT1460H, LT1460L, LT1460M LT1460-5 0.1Hz ≤ f ≤ 10Hz 20 µV P-P 10Hz ≤ f ≤ 1kHz 20 µV RMS LT1460-10 0.1Hz ≤ f ≤ 10Hz 40 µV P-P 10Hz ≤ f ≤ 1kHz 35 µV RMS LT1460HC, LT1460JC, LT1460KC 0.1Hz ≤ f ≤ 10Hz 4 ppm (P-P) 10Hz ≤ f ≤ 1kHz 4 ppm (RMS) Long-Term Stability of Output Voltage (Note 8) 40 ppm/√kHr S8 Pkg LT1460HC, LT1460JC, LT1460KC 100 ppm/√kHr Hysteresis (Note 9) ΔT = 0°C to 70°C 25 ppm LT1460A, LT1460B, LT1460C, LT1460D, LT1460E, ΔT = –40°C to 85°C 160 ppm LT1460F, LT1460G, LT1460H, LT1460L, LT1460M LT1460HC, LT1460JC, LT1460KC ΔT = 0°C to 70°C l 50 ppm ΔT = –40°C to 85°C l 250 ppm Note 1: Stresses beyond those listed under Absolute Maximum Ratings and then integrated for a fixed period, making the final reading an average may cause permanent damage to the device. Exposure to any Absolute as opposed to RMS. A correction factor of 1.1 is used to convert from Maximum Rating condition for extended periods may affect device average to RMS and a second correction of 0.88 is used to correct for the reliability and lifetime. nonideal pass band of the filters. Note 2: If the part is stored outside of the specified temperature range, the Note 8: Long-term stability typically has a logarithmic characteristic and output may shift due to hysteresis. therefore, changes after 1000 hours tend to be much smaller than before Note 3: Temperature coefficient is measured by dividing the change in that time. Total drift in the second thousand hours is normally less than output voltage by the specified temperature range. Incremental slope is one third that of the first thousand hours with a continuing trend toward also measured at 25°C. reduced drift with time. Significant improvement in long-term drift can be realized by preconditioning the IC with a 100 hour to 200 hour, 125°C Note 4: Load regulation is measured on a pulse basis from no load to the burn-in. Long-term stability will also be affected by differential stresses specified load current. Output changes due to die temperature change between the IC and the board material created during board assembly. See must be taken into account separately. PC Board Layout in the Applications Information section. Note 5: Thermal regulation is caused by die temperature gradients created Note 9: Hysteresis in output voltage is created by package stress that by load current or input voltage changes. This effect must be added to differs depending on whether the IC was previously at a higher or lower normal line or load regulation. This parameter is not 100% tested. temperature. Output voltage is always measured at 25°C, but the IC is Note 6: Excludes load regulation errors. For LT1460S3, ΔVOUT ≤ 0.2%. For cycled to 85°C or –40°C before successive measurements. Hysteresis all other packages, ΔVOUT ≤ 0.1%. is roughly proportional to the square of the temperature change. For Note 7: Peak-to-peak noise is measured with a single highpass filter at instruments that are stored at reasonably well-controlled temperatures 0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air (within 20 or 30 degrees of operating temperature) hysteresis is generally environment to eliminate thermocouple effects on the leads. The test time not a problem. is 10 sec. RMS noise is measured with a single highpass filter at 10Hz and Note 10: The LT1460S3 is guaranteed functional over the operating a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified temperature range of –40° to 85°C. 1460fc 

LT1460 typical perForMance characteristics LT1460-2.5 (N8, S8, MS8, Z Packages) 2.5V Minimum Input-Output Voltage Differential 2.5V Load Regulation, Sourcing 2.5V Load Regulation, Sinking 100 6 80 70 mV) 5 mV) 125°C NT (mA) 10 HANGE ( 4 125°C HANGE ( 6500 UTPUT CURRE 1 125°C –5255°°CC UT VOLTAGE C 32 25°C UT VOLTAGE C 4300 25°C O TP –55°C TP 20 OU 1 OU –55°C 10 0.1 0 0 0 0.5 1.0 1.5 2.0 2.5 0.1 1 10 100 0 0.5 1.0 1.5 INPUT-OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1460 G01 1460 G02 1460 G03 2.5V Output Voltage 2.5V Supply Current vs Input Temperature Drift Voltage 2.5V Line Regulation 2.503 175 2.5014 3 TYPICAL PARTS 150 125°C 125°C 2.502 2.5010 OUTPUT VOLTAGE (V)22..550010 SUPPLY CURRENT (µA) 1120755050 –5255°°CC OUTPUT VOLTAGE (V)222...554009009628 –2555°°CC 2.499 25 2.4994 2.498 0 2.4990 –50 –25 0 25 50 75 100 0 5 10 15 20 0 2 4 6 8 10 12 14 16 18 20 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1460 G04 1460 G05 1460 G06 2.5V Power Supply Rejection 2.5V Output Impedance vs Ratio vs Frequency Frequency 2.5V Transient Responses 90 1k B) 80 CL= 0.1µF 10 REJECTION RATIO (d 76540000 MPEDANCE (Ω)100 CL = 0 D CAPACITANCE (µF) 0.11 WER SUPPLY 321000 OUTPUT I 10 LOA 0 IOUT = 10mA 1460 G09 PO 0 CL= 1µF –10 1 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) 1460 G07 1460 G08 1460fc 

LT1460 typical perForMance characteristics 2.5V Output Voltage Noise 2.5V Long-Term Drift Spectrum 2.5V Output Noise 0.1Hz to 10Hz Three Typical Parts (S8 Package) 1000 2.5000 2.4998 Hz) DIV) V) OISE VOLTAGE (nV/√ UTPUT NOISE (10µV/ OUTPUT VOLTAGE (22..44999964 N O 2.4992 100 2.4990 10 100 1k 10k 100k 0 1 2 3 4 5 6 7 8 9 10 0 200 400 600 800 1000 FREQUENCY (Hz) TIME (SEC) TIME (HOURS) 1460 G10 1460 G11 1460 G12 LT1460-5 (N8, S8, MS8, Z Packages) 5V Minimum Input-Output Voltage Differential 5V Load Regulation, Sourcing 5V Load Regulation, Sinking 100 6 100 90 V) 5 V) m m 80 T (mA) 10 125°C 25°C ANGE ( 4 ANGE ( 70 N H H 60 RRE GE C 3 125°C 25°C GE C 50 –55°C 25°C U A A C T T OUTPUT 1 –55°C PUT VOL 2 –55°C PUT VOL 4300 125°C UT UT 20 O 1 O 10 0.1 0 0 0 0.5 1.0 1.5 2.0 2.5 0.1 1 10 100 0 1 2 3 4 5 INPUT-OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1460 G13 1460 G14 1460 G15 5V Output Voltage 5V Supply Current vs Input Temperature Drift Voltage 5V Line Regulation 5.004 200 5.002 3 TYPICAL PARTS 180 125°C 25°C 5.002 160 5.000 OUTPUT VOLTAGE (V)54..090908 SUPPLY CURRENT (µA) 1114208600000 –2555°°CC OUTPUT VOLTAGE (V) 44..999986 1–2555°°CC 4.996 40 4.994 20 4.994 0 4.992 –50 –25 0 25 50 75 100 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 20 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1460 G16 1460 G17 1460 G18 1460fc 

LT1460 typical perForMance characteristics LT1460-5 (N8, S8, MS8, Z Packages) 5V Power Supply Rejection Ratio 5V Output Impedance vs vs Frequency Frequency 5V Transient Responses 90 1k O (dB) 80 CL= 0.1µF CL = 0 µF) 10 N RATI 7600 E (Ω)100 ANCE ( 1 O C T R SUPPLY REJECTI 54320000 OUTPUT IMPEDAN 101 LOAD CAPACI 0.10 WE CL= 1µF 0.2ms/DIV 1460 G21 PO 10 IOUT = 10mA 0 0.1 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) 1460 G19 1460 G20 5V Output Voltage Noise Spectrum 5V Output Noise 0.1Hz to 10Hz 3000 2000 Hz) DIV) GE (nV/√1000 E (10µV/ A S OLT NOI E V UT S P OI UT N O 100 10 100 1k 10k 100k 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (Hz) TIME (SEC) 1460 G22 1460 G23 LT1460-10 (N8, S8, MS8, Z Packages) 10V Minimum Input/Output Voltage Differential 10V Load Regulation, Sourcing 10V Load Regulation, Sinking 100 10 100 9 90 mV) 8 mV) 80 T (mA)10 ANGE ( 7 ANGE ( 70 25°C N H 6 H 60 RRE GE C 5 125°C 25°C GE C 50 –55°C 125°C U A A C T T UTPUT 1 125°C –5255°°CC UT VOL 43 UT VOL 4300 O P P UT 2 UT 20 O –55°C O 1 10 0.1 0 0 0 0.5 1.0 1.5 2.0 2.5 0.1 1 10 100 0 1 2 3 4 5 INPUT/OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1460 G24 1460 G25 1460 G26 1460fc 0

LT1460 typical perForMance characteristics 10V Output Voltage 10V Supply Current vs Input Temperature Drift Voltage 10V Line Regulation 10.006 400 10.004 3 TYPICAL PARTS 360 10.002 320 10.000 25°C OUTPUT VOLTAGE (V) 999...999999048 SUPPLY CURRENT (µA) 212214608200000 –51522°55C°°CC OUTPUT VOLTAGE (V) 999...999899826 1–2555°°CC 80 9.986 9.984 40 9.982 0 9.980 –50 –25 0 25 50 75 100 0 2 4 6 8 10 12 14 16 18 20 6 8 10 12 14 16 18 20 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1460 G27 1460 G28 1460 G29 10V Power Supply Rejection 10V Output Impedance vs Ratio vs Frequency Frequency 10V Transient Responses 100 1000 dB) 90 CL = 0µF 10 UPPLY REJECTION RATIO ( 465837000000 TPUT IMPEDANCE (Ω)11000 CL = 1µF CL = 0.1µF LOAD CAPACITANCE (µF) 0.110 ER S 20 OU 1 W 200µs/DIV 1460 G32 PO 10 IOUT = 10mA 0 0.1 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 INPUT FREQUENCY (kHz) FREQUENCY (kHz) 1460 G30 1460 G31 10V Output Voltage Noise Spectrum 10V Output Noise 0.1Hz to 10Hz 10 Hz) DIV) V/√ µV/ µ 0 GE ( E (5 VOLTA 1 T NOIS OISE UTPU N O 0.1 0.01 0.1 1 10 100 0 2 4 6 8 10 12 14 FREQUENCY (kHz) TIME (SEC) 1460 G33 1460 G34 1460fc 

LT1460 typical perForMance characteristics Characteristic curves are similar for all voltage options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. LT1460S3-2.5V Minimum Input- LT1460S3-2.5V Load Regulation, LT1460S3-2.5V Load Regulation, Output Voltage Differential Sourcing Sinking 100 0 120 –0.5 mV) mV)100 NT (mA) 10 125°C HANGE (––11..50 –55°C HANGE ( 80 OUTPUT CURRE 1 –5255°°CC UTPUT VOLTAGE C–––322...005 125°C 25°C UTPUT VOLTAGE C 4600 25°C 125°C –55°C O O 20 –3.5 0.1 –4.0 0 0 0.5 1.0 1.5 2.0 2.5 0.1 1 10 100 0 1 2 3 4 5 INPUT-OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1460 G35 1460 G36 1460 G37 LT1460S3-2.5V Output Voltage LT1460S3-2.5V Supply Current Temperature Drift vs Input Voltage LT1460S3-2.5V Line Regulation 2.503 250 2.502 THREE TYPICAL PARTS 2.501 2.502 25°C 25°C 200 UTPUT VOLTAGE (V) 222...455900901 PPLY CURRENT (µA) 110500 125°C –55°C UTPUT VOLTAGE (V) 2222....544409990987 –15255°°CC O U O S 2.496 50 2.498 2.495 2.497 0 2.494 –50 –25 0 25 50 75 100 125 0 5 10 15 20 0 2 4 6 8 10 12 14 16 18 20 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1460 G38 1460 G39 1460 G40 LT1460S3-2.5V Power Supply LT1460S3-2.5V Output Impedance LT1460S3-2.5V Transient Rejection Ratio vs Frequency vs Frequency Response 80 1000 dB) 70 CL = 0µF 20 ON RATIO ( 5600 CE (Ω)100 CL = 0.1µF ENT (mA) 10 ECTI DAN URR PPLY REJ 4300 PUT IMPE 10 CL = 1µF LOAD C 1 U T 0.1 R S 20 OU 1 POWE 10 CLOAD = 0µF 200µs/DIV 1460 G43 0 0.1 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) FREQUENCY (kHz) 1460 G41 1460 G42 1460fc 

LT1460 typical perForMance characteristics Characteristic curves are similar for all voltage options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. LT1460S3-2.5V Output Voltage LT1460S3-2.5V Output Noise LT1460S3-10V Minimum Input- Noise Spectrum 0.1Hz to 10Hz Output Voltage Differential 1000 100 NOISE VOLTAGE (nV/√Hz) OUTPUT NOISE (20µV/DIV) OUTPUT CURRENT (mA) 101 125°C–552°5C°C 100 0.1 10 100 1k 10k 100k TIME (2 SEC/DIV) 0 0.5 1.0 1.5 2.0 2.5 FREQUENCY (Hz) 1460 G45 INPUT-OUTPUT VOLTAGE (V) 1460 G44 1460 G46 LT1460S3-10V Load Regulation, LT1460S3-10V Load Regulation, LT1460S3-10V Output Voltage Sourcing Sinking Temperature Drift 35 250 10.006 THREE TYPICAL PARTS 10.004 30 mV) 25 mV) 200 10.002 GE ( GE ( 125°C V)10.000 GE CHAN 2105 GE CHAN 150 25°C OLTAGE ( 999...999999864 UT VOLTA 105 UT VOLTA 100 –55°C OUTPUT V 99..999920 UTP 0 –55°C UTP 50 9.988 O O 9.986 –5 125°C 25°C 9.984 –10 0 9.982 0.1 1 10 100 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) TEMPERATURE (°C) 1460 G47 1460 G48 1460 G49 LT1460S3-10V Supply Current vs Input Voltage LT1460S3-10V Line Regulation 350 10.010 300 10.005 25°C Y CURRENT (µA)212055000 125°C –55°C UT VOLTAGE (V)190..909050 1–225555°°°CCC UPPL100 OUTP 9.990 S 9.985 50 0 9.980 0 2 4 6 8 10 12 14 16 18 20 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1460 G50 1460 G51 1460fc 

LT1460 typical perForMance characteristics Characteristic curves are similar for all voltage options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. LT1460S3-10V Power Supply LT1460S3-10V Output Impedance LT1460S3-10V Transient Rejection Ratio vs Frequency vs Frequency Response 100 1000 dB) 90 20 CTION RATIO ( 876000 ANCE (Ω)100 CL = 0.1µF CL = 0µF RRENT (mA) 10 REJE 50 MPED 10 D CU 1 PLY 40 UT I LOA UP 30 TP CL = 1µF 0.1 R S 20 OU 1 E W 200µs/DIV 1460 G54 O 10 P CLOAD = 0µF 0 0.1 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) FREQUENCY (kHz) 1460 G52 1460 G53 LT1460S3-10V Output Voltage LT1460S3-10V Output Noise Noise Spectrum 0.1Hz to 10Hz 10 Hz) DIV) AGE (µV/√ 1 SE (20µV/ OLT NOI E V UT S P OI UT N O 0.1 0.01 0.1 1 10 100 TIME (2 SEC/DIV) FREQUENCY (kHz) 1460 G56 1460 G55 1460fc 

LT1460 applications inForMation Longer Battery Life the ringing can be reduced with a small resistor in series with the reference output as shown in Figure 4. Figure 5 Series references have a large advantage over older shunt shows the response of the LT1460-2.5 with a R = 2Ω and style references. Shunt references require a resistor from S the power supply to operate. This resistor must be chosen to supply the maximum current that can ever be demanded by the circuit being regulated. When the circuit being VGEN 2.5V controlled is not operating at this maximum current, the 1.5V shunt reference must always sink this current, resulting VOUT RL = 10k in high dissipation and short battery life. The LT1460 series reference does not require a current set- VOUT RL = 1k ting resistor and can operate with any supply voltage from V + 0.9V to 20V. When the circuitry being regulated does OUT 1µs/DIV 1460 F02 not demand current, the LT1460 reduces its dissipation and battery life is extended. If the reference is not delivering load Figure 2. CL = 0 current it dissipates only a few mW, yet the same configura- tion can deliver 20mA of load current when demanded. VGEN 2.5V Capacitive Loads 1.5V The LT1460 is designed to be stable with capacitive loads. VOUT RL = 10k With no capacitive load, the reference is ideal for fast set- tling, applications where PC board space is a premium, VOUT RL = 1k or where available capacitance is limited. The test circuit for the LT1460-2.5 shown in Figure 1 is 20µs/DIV 1460 F03 used to measure the response time for various load cur- Figure 3. C = 0.01µF rents and load capacitors. The 1V step from 2.5V to 1.5V L produces a current step of 1mA or 100µA for R = 1k or L R = 10k. Figure 2 shows the response of the reference L RS VOUT RL with no load capacitance. VIN = 5V LT1460-2.5 VGEN The reference settles to 2.5mV (0.1%) in less than 1µs 0.1CµINF CL 21..55VV 1460 F04 for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step. When load capacitance is greater than 0.01µF, the refer- Figure 4. Isolation Resistor Test Circuit ence begins to ring due to the pole formed with the output impedance. Figure 3 shows the response of the reference to a 1mA and 100µA load current step with a 0.01µF load capacitor. The ringing can be greatly reduced with a DC VGEN 2.5V 1.5V load as small as 200µA. With large output capacitors, ≥1µF, VOUT RRLS == 10k VIN = 5V LT1460-2.5 VOUT RL VGEN VOUT RRLS == 12kΩ 0.1CµINF CL 21..55VV 1460 F01 0.1ms/DIV 1460 F05 Figure 1. Response Time Test Circuit Figure 5. Effect of R for C = 1µF S L 1460fc 

LT1460 applications inForMation C = 1µF. R should not be made arbitrarily large because and 100µA load current step with a 0.01µF load capacitor. L S it will limit the load regulation. Figure 9 to Figure 11 illustrate response of the LT1460-10. The 1V step from 10V to 9V produces a current step of Figure 6 to Figure 8 illustrate response in the LT1460-5. 1mA or 100µA for R = 1k or R = 10k. Figure 10 shows The 1V step from 5V to 4V produces a current step of L L the response of the reference with no load capacitance. 1mA or 100µA for R = 1k or R = 10k. Figure 7 shows the L L response of the reference with no load capacitance. The reference settles to 10mV (0.1%) in 0.4µs for a 100µA pulse and to 0.1% in 0.8µs with a 1mA step. When load The reference settles to 5mV (0.1%) in less than 2µs for capacitance is greater than 0.01µF, the reference begins a 100µA pulse and to 0.1% in 3µs with a 1mA step. When to ring due to the pole formed with the output impedance. load capacitance is greater than 0.01µF, the reference begins Figure 11 shows the response of the reference to a 1mA and to ring due to the pole formed with the output impedance. 100µA load current step with a 0.01µF load capacitor. Figure 8 shows the response of the reference to a 1mA VOUT RL VOUT RL VIN = 5V LT1460-5 VGEN VIN = 12.5V LT1460-10 VGEN 0.1CµINF CL 54VV 0.1CµINF CL 190VV 1460 F06 1460 F09 Figure 6. Response Time Test Circuit Figure 9. Response Time Test Circuit VGEN 5V VGEN 10V 4V 9V VOUT RL = 10k VOUT RL = 10k VOUT RL = 1k VOUT RL = 1k 2µs/DIV 1460 F07 2µs/DIV 1460 F10 Figure 7. C = 0 Figure 10. C = 0 L L VGEN 5V 10V 4V VGEN 9V VOUT RL = 10k VOUT RL = 10k VOUT RL = 1k VOUT RL = 1k 10µs/DIV 1460 F08 10µs/DIV 1460 F11 Figure 8. C = 0.01µF Figure 11. C = 0.01µF L L 1460fc 

LT1460 applications inForMation The LT1460S3 family of references are designed to be 1mA and 10mA load steps with no load capacitance, and stable with a large range of capacitive loads. With no Figure 14 shows a 1mA and 10mA load step with a 0.1µF capacitive load, these references are ideal for fast settling output capacitor. Figure 15 shows the response to a 1mA or applications where PC board space is a premium. The load step with C = 1µF and 4.7µF. L test circuit shown in Figure 12 is used to measure the The frequency compensation of the LT1460S3 version is response time and stability of various load currents and slightly different than that of the other packages. Additional load capacitors. This circuit is set for the 2.5V option. For care must be taken when choosing load capacitance in an other voltage options, the input voltage must be scaled application circuit. up and the output voltage generator offset voltage must be adjusted. The 1V step from 2.5V to 1.5V produces a Table 1 gives the maximum output capacitance for vari- current step of 10mA or 1mA for R = 100Ω or R = 1k. ous load currents and output voltages of the LT1460S3 to L L Figure 13 shows the response of the reference to these avoid instability. Load capacitors with low ESR (effective series resistance) cause more ringing than capacitors with higher ESR such as polarized aluminum or tantalum VOUT RL capacitors. VIN = 2.5V LT1460S3-2.5 VGEN 0.1CµINF CL 21..55VV 1460 F12 VGEN 2.5V Figure 12. Response Time Test Circuit 1.5V VOUT 1mA VGEN 2.5V VOUT 10mA 1.5V VOUT 1mA 100µs/DIV 1460 F14 Figure 14. C = 0.1µF VOUT 10mA L 1µs/DIV 1460 F13 Figure 13. CL = 0µF VGEN 2.5V 1.5V VOUT 1µA VOUT 4.7µA 100µs/DIV 1460 F15 Figure 15. I = 1mA OUT 1460fc 

LT1460 applications inForMation Hysteresis Table 1. Maximum Output Capacitance for LT1460S3 VOLTAGE Hysteresis data shown in Figure 17 and Figure 18 represents OPTION I = 100µA I = 1mA I = 10mA I = 20mA OUT OUT OUT OUT the worst-case data taken on parts from 0°C to 70°C and 2.5V >10µF >10µF 2µF 0.68µF from –40°C to 85°C. The device is capable of dissipating 3V >10µF >10µF 2µF 0.68µF relatively high power, i.e., for the LT1460S3-2.5, PD = 17.5V 3.3V >10µF >10µF 1µF 0.68µF • 20mA = 350mW. The thermal resistance of the SOT-23 5V >10µF >10µF 1µF 0.68µF package is 325°C/W and this dissipation causes a 114°C 10V >10µF 1µF 0.15µF 0.1µF internal rise producing a junction temperature of T = 25°C J + 114°C = 139°C. This elevated temperature will cause Long-Term Drift the output to shift due to thermal hysteresis. For highest performance in precision applications, do not let the Long-term drift cannot be extrapolated from accelerated LT1460S3’s junction temperature exceed 85°C. high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic. The only way long-term drift can be determined is to measure it over 18 WORST-CASE HYSTERESIS the time interval of interest. The LT1460S3 long-term 16 ON 40 UNITS drift data was taken on over 100 parts that were soldered 14 into PC boards similar to a “real world” application. The TS12 NI boards were then placed into a constant temperature oven F U10 with TA = 30°C, their outputs were scanned regularly and BER O 8 70°C TO 25°C 0°C TO 25°C M measured with an 8.5 digit DVM. Figure 16 shows typical U 6 N long-term drift of the LT1460S3s. 4 2 150 0 –240–200–160–120 –80 –40 0 40 80 120 160 200 240 100 HYSTERESIS (ppm) 1460 F17 Figure 17. 0°C to 70°C Hysteresis 50 m pp 0 9 WORST-CASE HYSTERESIS –50 8 ON 34 UNITS 7 –100 TS 6 85°C TO 25°C –40°C TO 25°C NI U –150 OF 5 0 100200 300400500600700800 9001000 R E 4 HOURS B M 1460 F16 U 3 N Figure 16. Typical Long-Term Drift 2 1 0 –600–500–400–300–200–100 0 100 200 300 400 500 600 HYSTERESIS (ppm) 1460 F18 Figure 18. –40°C to 85°C Hysteresis 1460fc 

LT1460 applications inForMation Input Capacitance Total worst-case output error is: It is recommended that a 0.1µF or larger capacitor be 0.075% + 0.035% + 0.070% = 0.180%. added to the input pin of the LT1460. This can help with Table 1 gives worst-case accuracy for the LT1460AC, CC, stability when large load currents are demanded. DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI from –40°C to 85°C. Output Accuracy Note that the LT1460-5 and LT1460-10 give identical ac- Like all references, either series or shunt, the error budget of curacy as a fraction of their respective output voltages. the LT1460-2.5 is made up of primarily three components: initial accuracy, temperature coefficient and load regulation. PC Board Layout Line regulation is neglected because it typically contrib- utes only 30ppm/V, or 75µV for a 1V input change. The In 13- to 16-bit systems where initial accuracy and tem- LT1460-2.5 typically shifts less than 0.01% when soldered perature coefficient calibrations have been done, the me- into a PCB, so this is also neglected (see PC Board Layout chanical and thermal stress on a PC board (in a cardcage section). The output errors are calculated as follows for a for instance) can shift the output voltage and mask the 100µA load and 0°C to 70°C temperature range: true temperature coefficient of a reference. In addition, the mechanical stress of being soldered into a PC board LT1460AC can cause the output voltage to shift from its ideal value. Surface mount voltage references (MS8 and S8) are the Initial accuracy = 0.075% most susceptible to PC board stress because of the small For IO = 100µA, and using the LT1460-2.5 for calculation, amount of plastic used to hold the lead frame. 3500ppm( )( ) A simple way to improve the stress-related shifts is to ΔV = 0.1mA 2.5V =875µV OUT   mount the reference near the short edge of the PC board,  mA  or in a corner. The board edge acts as a stress boundary, which is 0.035%. or a region where the flexure of the board is minimum. The package should always be mounted so that the leads For temperature 0°C to 70°C the maximum ΔT = 70°C, absorb the stress and not the package. The package is 10ppm( )( ) generally aligned with the leads parallel to the long side ΔV = 70°C 2.5V =1.75mV OUT   of the PC board as shown in Figure 20a.  °C  A qualitative technique to evaluate the effect of stress on which is 0.07%. voltage references is to solder the part into a PC board and Table 2. Worst-Case Output Accuracy Over Temperature I LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI LT1460HC LT1460JC LT1460KC OUT 0 0.145% 0.225% 0.205% 0.240% 0.375% 0.325% 0.425% 0.562% 0.340% 0.540% 0.850% 100µA 0.180% 0.260% 0.240% 0.275% 0.410% 0.360% 0.460% 0.597% 0.380% 0.580% 0.890% 10mA 0.325% 0.405% 0.385% 0.420% 0.555% 0.505% 0.605% 0.742% 0.640% 0.840% 1.15% 20mA 0.425% N/A 0.485% 0.520% N/A 0.605% 0.705% N/A 0.540% 0.740% 1.05% 1460fc 

LT1460 applications inForMation deform the board a fixed amount as shown in Figure 19. 250µV and implies a 50ppm and 100ppm change respec- The flexure #1 represents no displacement, flexure #2 is tively. This corresponds to a 13- to 14-bit system and is concave movement, flexure #3 is relaxation to no displace- not a problem for most 10- to 12-bit systems unless the ment and finally, flexure #4 is a convex movement. This system has a calibration. In this case, as with temperature motion is repeated for a number of cycles and the relative hysteresis, this low level can be important and even more output deviation is noted. The result shown in Figure 20a careful techniques are required. is for two LT1460S8-2.5s mounted vertically and Figure The most effective technique to improve PC board stress 20b is for two LT1460S8-2.5s mounted horizontally. The is to cut slots in the board around the reference to serve parts oriented in Figure 20a impart less stress into the as a strain relief. These slots can be cut on three sides of package because stress is absorbed in the leads. Figures the reference and the leads can exit on the fourth side. This 20a and 20b show the deviation to be between 125µV and “tongue” of PC board material can be oriented in the long direction of the board to further reduce stress transferred 1 to the reference. 2 The results of slotting the PC boards of Figures 20a and 3 20b are shown in Figures 21a and 21b. In this example the slots can improve the output shift from about 100ppm 4 1460 F19 to nearly zero. Figure 19. Flexure Numbers 2 2 V) V) m m N ( 1 N ( 1 O O TI TI A A VI VI E E D D UT 0 LONG DIMENSION UT 0 LONG DIMENSION P P T T U U O O –1 –1 0 10 20 30 40 0 10 20 30 40 FLEXURE NUMBER FLEXURE NUMBER 1460 F20a 1460 F20b Figure 20a. Two Typical LT1460S8-2.5s, Vertical Figure 20b. Two Typical LT1460S8-2.5s, Horizontal Orientation Without Slots Orientation Without Slots 2 2 V) V) m m N ( 1 N ( 1 O O TI TI A A VI VI E E D D T T U 0 U 0 P P T T U U O SLOT O SLOT –1 –1 0 10 20 30 40 0 10 20 30 40 FLEXURE NUMBER FLEXURE NUMBER 1460 F21a 1460 F21b Figure 21a. Same Two LT1460S8-2.5s in Figure 16a, Figure 21b. Same Two LT1460S8-2.5s in Figure 16b, but with Slots but with Slots 1460fc 0

LT1460 siMpliFieD scheMatic VCC VOUT GND 1460 SS package Description S3 Package 3-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1631) 0.764 2.80 – 3.04 (.110 – .120) 0.8 ±0.127 2.10 – 2.64 1.20 – 1.40 2.74 (.083 – .104) (.047 – .060) 0.96 BSC 1.92 0.45 – 0.60 RECOMMENDED SOLDER PAD LAYOUT (.017 – .024) 0.89 – 1.03 0.37 – 0.51 (.035 – .041) (.015 – .020) 0.89 – 1.12 0.01 – 0.10 (.035 – .044) (.0004 – .004) 0.55 1.78 – 2.05 (.022) 0.09 – 0.18 (.070 – .081) REF (.004 – .007) S3 SOT-23 0502 NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE JEDEC REFERENCE IS TO-236 VARIATION AB 1460fc 

LT1460 package Description N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 .255 ± .015* (6.477 ± 0.381) 1 2 3 4 .300 – .325 .045 – .065 .130 ± .005 (7.620 – 8.255) (1.143 – 1.651) (3.302 ± 0.127) .065 (1.651) .008 – .015 TYP (0.203 – 0.381) .120 (3.048) .020 .325+–..003155 .100 .018 ± .0M0I3N (0M.5I0N8) ( +0.889) 8.255 (2.54) (0.457 ± 0.076) –0.381 BSC N8 1002 NOTE: INCHES 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 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° .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 1460fc 

LT1460 package Description MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 0.889 ± 0.127 (.035 ± .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 3.00 ± 0.102 0.42 ± 0.038 0.65 (.118 ± .004) 0.52 (.0165 ± .0015) (.0256) (NOTE 3) 8 7 6 5 (.0205) TYP BSC REF RECOMMENDED SOLDER PAD LAYOUT 3.00 ± 0.102 4.90 ± 0.152 DETAIL “A” (.118 ± .004) 0.254 (.193 ± .006) (NOTE 4) (.010) 0° – 6° TYP GAUGE PLANE 1 2 3 4 0.53 ± 0.152 (.021 ± .006) 1.10 0.86 (.043) (.034) DETAIL “A” MAX REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 0.1016 ± 0.0508 (.009 – .015) (.004 ± .002) TYP 0.65 MSOP (MS8) 0307 REV F (.0256) NOTE: BSC 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 1460fc 

LT1460 package Description Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DWG # 05-08-1410 Rev C) .060(cid:112) .005 .180(cid:112) .005 (1.524(cid:112) 0.127) (4.572(cid:112) 0.127) DIA .90 (2.286) NOM .180(cid:112) .005 (4.572(cid:112) 0.127) 5(cid:111) NOM .500 .050 UNCONTROLLED (12.70) (1.270)LEAD DIMENSION MIN MAX .016(cid:112) .003 .015(cid:112) .002 .050 (0.406(cid:112) 0.076) (0.381(cid:112) 0.051) Z3 (TO-92) 1008 REV C .098 +.016/–.04 (1.27) (2.5 +0.4/–0.1) BSC 2 PLCS BULK PACK TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF .060(cid:112) .010 LTC DATA BOOK FOR ADDITIONAL INFORMATION (1.524(cid:112) 0.254) .140(cid:112) .010 3 2 1 (3.556(cid:112) 0.127) 10(cid:111)NOM 1460fc 

LT1460 revision history (Revision history begins at Rev C) REV DATE DESCRIPTION PAGE NUMBER C 3/10 Change θJA on S3 Package from 325°C/W to 228°C/W 2 1460fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT1460 typical applications Handling Higher Load Currents V+ 40mA + 47µF IN R1* LT1460 10mA OUT VOUT GND RL TCYUPRIRCEANLT L =O A5D0mA *SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT. LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN R1 = V+ – VOUT PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL 40mA BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION 1460 TA03 Boosted Output Current with No Current Limit Boosted Output Current with Current Limit V+ ≥ (VOUT + 1.8V) + V+ ≥ VOUT + 2.8V + R1 47µF D1* R1 8.2Ω 47µF 220Ω LED 220Ω 2N2905 2N2905 IN IN LT1460 LT1460 GND OUT + 2SµOFLID V10O0UmTA GND OUT + 2µF V10O0UmTA SOLID TANT TANT *GLOWS IN CURRENT LIMIT, 1460 TA04 DO NOT OMIT 1460 TA05 relateD parts PART NUMBER DESCRIPTION COMMENTS LT1019 Precision Bandgap Reference 0.05% Max, 5ppm/°C Max LT1027 Precision 5V Reference 0.02%, 2ppm/°C Max LT1236 Precision Low Noise Reference 0.05% Max, 5ppm/°C Max, SO Package LT1461 Micropower Precision Low Dropout 0.04% Max, 3ppm/°C Max, 50mA Output Current LT1634 Micropower Precision Shunt Reference 1.25V, 2.5V Output 0.05%, 25ppm/°C Max LT1790 Micropower Precision Series References 0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package LTC®1798 Micropower Low Dropout Reference, Fixed or Adjustable 0.15% Max, 40ppm/°C, 6.5µA Max Supply Current LTC6652 Low Drift Low Noise Buffered Reference 0.05% Accuracy, 5ppm/°C Drift, 2.1ppm (0.1Hz to 10Hz) Noise LT6660 Tiny Micropower Precision Series References 0.075% Max, 10ppm/°C Max, 20mA Output, 2mm × 2mm DFN Package 1460fc  Linear Technology Corporation LT 0310 REV C • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com  LINEAR TECHNOLOGY CORPORATION 2006