LT6650 Micropower, 400mV Reference with Rail-to-Rail Buffer Amplifier in SOT-23 FEATURES DESCRIPTIOU ■ Low Quiescent Current 5.6µA (typical) The LT®6650 is a micropower, low voltage 400mV refer- ■ Wide Supply Range: 1.4V to 18V ence. Operating with supplies from 1.4V up to 18V, the ■ 400mV Reference ±1% Maximum Accuracy Over device draws only 5.6µA typical, making it ideal for low Temperature at 5V voltage systems as well as handheld instruments and ■ Rail-to-Rail Buffer Amplifier industrial control systems. With only two resistors the ■ 0.5% 400mV Maximum Initial Accuracy at 5V internal buffer amplifier can scale the 400mV reference to ■ Shunt Configurable any desired value up to the supply voltage. ■ Sinks and Sources Current The reference is postpackage-trimmed to increase the ■ Wide Operational Range –40°C to 125°C output accuracy. The output can sink and source 200µA ■ Externally Adjustable Output Voltage over temperature. Quiescent power dissipation is 28µW. ■ Low Profile 1mm 5-lead SOT-23 Stability is ensured with any output capacitor of 1µF or (ThinSOT™) Package higher. APPLICATIOUS The LT6650 is the lowest voltage series reference available in the 5-lead SOT-23 package. ■ Battery-Operated Systems , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. ■ Handheld Instruments All other trademarks are the property of their respective owners. ■ Industrial Control Systems ■ Data Acquisition Systems ■ Negative Voltage References TYPICAL APPLICATIOU Battery-Powered 0.4V Reference LT6650 Temperature Drift VIN = 1.4V TO 18V 402 TYPICAL LT6650 PART IQ ≈ 6µA VIN = 5V 4 mV) 401 NO LOAD IN LT6650 E ( G A SINK 200µA VRRE F=E 4R0E0NmCVE + VOLT 400 OUT 5 V0.O4UVT ENCE SOURCE –200µA – R E EF 399 R GND FB 1 1µF 2 1µF 398 –50 –30 –10 10 30 50 70 90 110 130 TEMPERATURE (°C) 6650 TA01a 6650 TA01b 6650fa 1

LT6650 ABSOLUTE WAXIWUW RATIUGS PACKAGE/ORDER IUFORWATIOU (Note 1) TOP VIEW Total Supply Voltage (V to GND)........................... 20V IN FB Voltage (Note 2) .......................20V to (GND – 0.3V) FB 1 5 OUT Output Voltage (OUT)....................20V to (GND – 0.3V) GND 2 DNC* 3 4 IN Output Short-Circuit Duration..........................Indefinite FB Input Current................................................... 10mA S5 PACKAGE 5-LEAD PLASTIC TSOT-23 Operating Temperature Range...............–40°C to 125°C *Do Not Connect TJMAX = 150°C, θJA = 230°C/W Specified Temperature Range ORDER PART NUMBER S5 PART MARKING LT6650CS5 .............................................0°C to 70°C LT6650CS5 LBDV LT6650IS5...........................................–40°C to 85°C LT6650IS5 LBDV LT6650HS5 (Note 3) .........................–40°C to 125°C LT6650HS5 LBDV Maximum Junction Temperature..........................150°C Storage Temperature Range (Note 4)....–65°C to 150°C Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Temperature (Soldering, 10 sec)..................300°C Lead Free Part Marking: http://www.linear.com/leadfree/ The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, CIN = 1µF, FB = OUT, no DC load, CL = 1µF, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Output Voltage (Notes 4, 5) LT6650 398 400 402 mV OUT –0.5 0.5 % LT6650CS5 ● 397 400 403 mV ● –0.75 0.75 % LT6650IS5 ● 396 400 404 mV ● –1 1 % LT6650HS5 ● 394 400 406 mV ● –1.5 1.5 % V Operating Input Voltage 1.4 18 V IN ∆VOUT/∆VIN Line Regulation 1.4V ≤ VIN ≤ 18V 1 6 mV 150 900 ppm/V LT6650CS5, LT6650IS5 ● 7.5 mV ● 1130 ppm/V LT6650HS5 ● 8.5 mV ● 1280 ppm/V ∆VOUT/∆IOUT Load Regulation (Note 6) Sourcing from 0µA to –200µA –0.04 –0.2 mV 500 2500 ppm/mA ● –0.4 mV ● 5000 ppm/mA Sinking from 0µA to 200µA 0.24 1 mV 3000 12500 ppm/mA ● 2 mV ● 20000 ppm/mA 6650fa 2

LT6650 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, CIN = 1µF, FB = OUT, no DC load, CL = 1µF, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS TC Output Voltage Temperature ● 30 ppm/°C Coefficient (Note 10) ∆VDO Dropout Voltage (Note 7) Referred to VIN = 1.8V, VOUT = 1.4V (R = 100k, R = 39.2k) F G ∆VOUT = –0.1%, IOUT = 0µA 75 100 mV ● 150 mV ∆VOUT = –0.1%, IOUT = –200µA Sourcing 165 250 mV ● 350 mV ∆VOUT = –0.1%, IOUT = 200µA Sinking (Note 11) –300 –150 mV ● 0 mV I Short-Circuit Output Current V Shorted to GND 5 mA SC OUT V Shorted to V 9 mA OUT IN IIN Supply Current 5.6 11 µA ● 14 µA VIN = 18V 5.9 12 µA ● 15 µA I FB Pin Input Current V = V = 400mV FB FB OUT 1.2 10 nA LT6650CS5, LT6650IS5 ● 15 nA LT6650HS5 ● 30 nA TON Turn-On Time CLOAD = 1µF 0.5 ms en Output Noise (Note 8) 0.1Hz ≤ ƒ ≤ 10Hz 20 µVP-P 10Hz ≤ ƒ ≤ 1KHz, IOUT = –200µA Sourcing 23 µVRMS VHYS Hysteresis (Note 9) ∆T = 0°C to 70°C ● 0.1 mV ● 250 ppm ∆T = –40°C to 85°C ● 0.24 mV ● 600 ppm Note 1: Absolute Maximum Ratings are those values beyond which the life Note 6: Load regulation is measured on a pulse basis from no load to the of a device may be impaired. specified load current. Output changes due to die temperature change Note 2: The FB pin is protected by an ESD diode to the ground. If the FB must be taken into account separately. input voltage exceeds –0.3V below ground, the FB input current should be Note 7: Dropout Voltage is (V – V ) when V falls to 0.1% below its IN OUT OUT limited to less than 10mA. If the FB input voltage is greater than 5V, the FB nominal value at V = 1.8V. IN input current is expected to meet specified performance from Typical Note 8: Peak-to-Peak noise is measured with a single pole highpass filter Performance Characteristics but is not tested or QA sampled at this at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still voltage. air environment to eliminate thermocouple effects on the leads. The test Note 3: If the part is operating at temperatures above 85°C, it is time is 10 seconds. recommended to enhance the stability margin by using an output Note 9: Hysteresis in the output voltage is created by package stress that capacitor greater than 10µF or a series RC combination having a 100µs differs depending on whether the IC was previously at a higher or lower equivalent time constant. See Application section for details. temperature. Output voltage is always measured at 25°C, but the IC is Note 4: If the part is stored outside of the specified temperature range, the cycled to 85°C or –40°C before a successive measurement. Hysteresis is output voltage may shift due to hysteresis. roughly proportional to the square of the temperature change. Note 5: ESD (Electrostatic Discharge) sensitive devices. Extensive use of Note 10: Temperature coefficient is measured by dividing the change in ESD protection devices are used internal to the LT6650; however, high output voltage by the specified temperature range. electrostatic discharge can damage or degrade the device. Use proper ESD Note 11: This feature guarantees the shunt mode operation of the device. handling precautions. 6650fa 3

LT6650 TYPICAL PERFORW AU CE CHARACTERISTICS (See Applications, Figure 1) Output Voltage Temperature Output Voltage Temperature Drift Drift Supply Current vs Input Voltage 404 403 10 TYPICAL PART THREE PARTS 403 VIN = 5V 402 8 125°C V) 402 V) A) m m µ OLTAGE ( 440001 VIN = 1.4V OLTAGE ( 401 URRENT ( 6 25°C V V C T T 400 Y 4 U 399 U L OUTP 398 VIN = 18V VIN = 5V OUTP SUPP –55°C 399 2 397 396 398 0 –60 –40 –20 0 20 40 60 80 100 120 –60 –40 –20 0 20 40 60 80 100 120 0 2 4 6 8 10 12 14 16 18 20 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 6650 G01 6650 G02 6650 G03 Supply Current vs Input Voltage Line Regulation Line Regulation 10 404 404 8 125°C 403 403 A) V) V) CURRENT (µ 6 25°C VOLTAGE (m440012 TA = 125°C VOLTAGE (m440012 TA = –55°C LY 4 –55°C UT TA = –55°C UT PP TP 400 TP 400 TA = 25°C U U U S O O 2 TA = 25°C TA = 125°C 399 399 0 398 398 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2 4 6 8 10 12 14 16 18 0.8 1.0 1.2 1.4 1.6 1.8 2.0 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 6650 G04 6550 G05 6650 G06 Minimum Input-Output Voltage Load Regulation (Sourcing) Load Regulation (Sinking) Differential (Sourcing) 0 1000 500 TYPICAL PART TYPICAL PART VOUT = 1.425V - TYP (RF = 100k, RG = 39.2k) –10 VIN = 5V 900 VIN = 5V 0.1% VOUT UT VOLTAGE CHANGE (V)µ ––––––234567000000 –1252555°°°CCC UT VOLTAGE CHANGE (V)µ 876543000000000000 –55°C25°C125°C T-OUTPUT VOLTAGE (mV) 432000000 1–225555°°°CCC P P U UT –80 UT 200 NP 100 O O I –90 100 –100 0 0 10 100 1000 10 100 1000 10 100 1000 OUTPUT CURRENT (µA) OUTPUT CURRENT (µA) OUTPUT CURRENT (µA) 6650 G07 6650 G08 6650 G09 6650fa 4

LT6650 TYPICAL PERFORW AU CE CHARACTERISTICS (See Applications, Figure 1) Minimum Input-Output Voltage Output Short-Circuit Current vs Output Short-Circuit Current vs Differential (Sinking) Input Voltage Input Voltage 0 14 14 VOUT = 1.425V - TYP (RF = 100k, RG = 39.2k) OUTPUT SHORTED TO GND OUTPUT SHORTED TO VIN 0.1% VOUT V)–100 12 12 LTAGE (m–200 –55°C NT (mA) 10 NT (mA) 10 25°C –55°1C25°C O E E T V URR 8 125°C URR 8 T-OUTPU–300 25°C UTPUT C 6 25°C UTPUT C 6 U O O INP–400 4 –55°C 4 125°C –500 2 2 10 100 1000 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT(µA) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 6650 G10 6650 G11 6650 G12 FB Pin Current vs FB Pin Voltage FB Pin Current vs FB Pin Voltage Gain and Phase vs Frequency 10 10 120 120 VFB ≠ VOUT VFB ≠ VOUT 8 CURRENT IS POSITIVE WHEN CURRENT IS POSITIVE WHEN 100 100 IT ENTERS THE DEVICE IT ENTERS THE DEVICE 6 A) 4 A) 125°C 80 80 N CURRENT (n –022 125°C N CURRENT (n 1 GAIN (dB) 642000 GAIN PHASE 642000 PHASE (DEG PI PI 0.1 ) B –4 B F F 0 0 –6 –55°C TA = 25°C –8 25°C –20 URNL I=T Y2k GAIN –20 25°C –55°C CL = 1µF –10 0.01 –40 –40 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 1 3 5 7 9 11 13 15 17 19 0.01 0.1 1 10 100 FB PIN VOLTAGE (V) FB PIN VOLTAGE (V) FREQUENCY (kHz) 6650 G13 6650 G14 6650 G15 Output Noise 0.1Hz to 10Hz Output Voltage Noise Spectrum Integrated Noise 10Hz to 1kHz 20 100 VIN = 5V VIN = 5V VIN = 5V CL = 1µF CL = 1µF IOUT = –200µA V/DIV) Hz)√ 15 V)µRMS TPUT NOISE (5µ OISE LEVEL (V/µ 10 IOUT = 0µA IOUT = –200µA GRATED NOISE ( 10 OU N 5 TE N I IOUT = –40µA 0 1 0 1 2 3 4 5 6 7 8 9 10 10 100 1k 10k 10 100 1k TIME (s) FREQUENCY (Hz) FREQUENCY (Hz) 6650 G16 6650 G17 6650 G18 6650fa 5

LT6650 TYPICAL PERFORW AU CE CHARACTERISTICS (See Applications, Figure 1) Output Impedance vs Frequency Output Impedance vs Frequency Output Impedance vs Frequency 1000 1000 1000 IOUT = 0µA IOUT = –40µA IOUT = 0µA RZ = 0Ω RZ = 0Ω CL • RZ = 100µs )Ω CL = 10µF )Ω )Ω CL = 1µF CE (100 CL = 1µF CE (100 CE (100 DAN DAN CL = 10µF CL = 1µF DAN PE PE PE CL = 10µF T IM T IM CL = 47µF T IM TPU 10 CL = 47µF TPU 10 TPU 10 OU OU OU CL = 47µF 1 1 1 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 6650 G19 6650 G20 6650 G21 Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Frequency Frequency Frequency 20 20 20 IOUT = 0µA IOUT = –40µA IOUT = 0µA O (dB) 100 RZ = 0Ω O (dB) 100 RZ = 0Ω CL = 10µF O (dB) 100 CL • RZ = 100µs TI TI CL = 1µF TI TION RA ––1200 CL = 10µF CL = 1µF TION RA ––1200 CL = 47µF TION RA ––1200 CL = 1µF C C C JE –30 JE –30 JE –30 E E E Y R –40 Y R –40 Y R –40 CL = 10µF L L L P P P P –50 P –50 P –50 SU CL = 47µF SU SU CL = 47µF R –60 R –60 R –60 E E E W W W O –70 O –70 O –70 P P P –80 –80 –80 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 6650 G22 6650 G23 6650 G24 Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Frequency Frequency Frequency 20 20 20 IOUT = 0µA IOUT = –40µA IOUT = 0µA dB) 10 RZ = 0Ω dB) 10 RZ = 0Ω dB) 10 CL • RZ = 100µs O ( 0 CIN = 1µF O ( 0 CIN = 1µF O ( 0 CIN = 1µF ATI RIN = 1k ATI RIN = 1k ATI RIN = 1k R –10 R –10 R –10 JECTION ––2300 CL = 10µF CL = 1µF JECTION ––2300 CL = 10µF JECTION ––2300 CL = 10µF CL = 1µF E E E R R R LY –40 LY –40 CL = 1µF LY –40 P P P ER SUP ––5600 CL = 47µF ER SUP ––5600 CL = 47µF ER SUP ––5600 CL = 47µF W W W O –70 O –70 O –70 P P P –80 –80 –80 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 6650 G25 6650 G26 6650 G27 6650fa 6

LT6650 PIU FUUCTIOUS FB (Pin 1): Resistor Divider Feedback Pin. Connect a IN (Pin 4): Positive Supply. Bypassing with a 1µF capacitor resistor divider from OUT to GND and the center tap to FB. is recommended if the output loading changes. This pin sets the output potential. OUT (Pin 5): Reference Output. The output sources and GND (Pin 2): Ground Connection. sinks current. It is stable with any load capacitor with a total capacitance of 1µF or more. Higher load capacitance DNC (Pin 3): Do not connect. Connected internally for post improves load transient response. package trim. This pin must be left unconnected. BLOCK DIAGRAW IN 4 LT6650 VR = 400mV + REFERENCE 5 OUT – DNC 3 1 FB 2 6650 BD GND APPLICATIOUS IUFORWATIOU Long Battery Life functions. Output impedance can be reduced by DC load- ing of the output by 40µA to 200µA, and/or adding an R The LT6650 is a micropower, adjustable reference which Z to the output capacitor for a 100µs time constant as shown operates from supply voltages ranging from 1.4V to 18V. in Figure 1 and the Typical Performance Characteristics The series regulated output may be configured with exter- graphs. nal resistors to any voltage from 400mV to nearly the supply potential. Under no-load conditions, the LT6650 The LT6650 Voltage reference should have an input by- dissipates only 8µW when operating on a 1.4V supply. pass capacitor of 0.1µF or larger. When the circuit is Other operating configurations allow the LT6650 to be used as a micropower positive or negative adjustable shunt reference from 1.4V to 18V. RIN IN OUT VIN 4 5 VOUT Bypass and Load Capacitor CIN LT6650 CL FB The LT6650 voltage reference requires a 1µF or greater 1 RZ output capacitance for proper operation. This capacitance 2 6650 F01 GND may be provided by either a single capacitor connected between OUT and GND or formed by the aggregate of several capacitors that may be serving other decoupling Figure 1. LT6650 Input-Output Configuration 6650fa 7

LT6650 APPLICATIOUS IUFORWATIOU operated from a small battery or other relatively high the same circuit responding to input transients of 0.5V, impedance source, a minimum 1µF capacitor is recom- settling in about 0.3ms. Figures 5 through 7 show the mended. PSRR can be significantly enhanced by adding a same circuit responding to various load steps: changes low-pass RC filter on the input, with a time-constant of between ±100µA in Figure 5; sourcing current step be- 1ms or higher, as shown in Figure 1. The Typical Perfor- tween –100µA and –200µA in Figure 6; and sinking current mance Characteristics graphs show performance as a function of several combinations of input and output VIN capacitance. 3V 2.5V An input RC of 100ms or more is recommended (such as 5k and 22µF) when output transients must be minimized in the face of high supply noise, such as in automotive applications. Figure 2 shows an input filter structure that VOUT 0.4V effectively eliminates supply transients from affecting the 0V output. With this extra input decoupling and the LT6650 operating normally from a 12V bus, 50V transients induce 2ms/DIV 6650 F04 less than <0.5% V perturbations. OUT Figure 4. Output Response to ±0.5V Input Step Figure 3 shows the turn-on response time for the circuit in Figure 1. The input voltage steps from 0V to 3V, and the output is configured to produce 400mV. Input bypass and VOUT 10mV/DIV output load capacitance are 1µF, R = 0Ω, R = 0Ω, and SINKING IN Z the output settles in approximately 0.5ms. Figure 4 shows SOURCING IOUT 100µA NOISY SINKING POWER BUS 100µA 33k 4.7k SOURCING VIN 1N751 6650 F05 1µF 5V 22µF Figure 5. Output Response to Bidirectional Load Step 6650 F02 (100µA to –100µA) Figure 2. High Noise-Immunity Input Network VOUT 10mV/DIV VIN AC 3V IOUT –100µA VOUT –200µA 0.4V 0V 0V 6650 F06 0.2ms/DIV 6650 F03 Figure 6. Output Response to Current-Sourcing Load Step Figure 3. LT6650 Turn-On Characteristic (–100µA to –200µA) 6650fa 8

LT6650 APPLICATIOUS IUFORWATIOU step between 100µA and 200µA in Figure 7. Load step settling contribution <0.15%). Since the V error distribution OUT occurs in about 0.5ms or less (to ±0.2%). increases at twice the resistor tolerance, high accuracy resistors or resistor networks are recommended. The Output Adjustment output voltage may be set to any level from 400mV up to 350mV below the supply voltage with source or sink If the LT6650 is to be used as a 400mV reference, then the capability. output and feedback pins may be tied together without any scale-setting components as shown in the front-page Noise Reduction Capacitor application circuit. Setting the output to any higher voltage is a simple matter of selecting two feedback resistors to In applications involving the use of resistive feedback for configure the non-inverting gain of the internal operational reference scaling, the intrinsic reference noise is amplified amplifier, as shown in Figure 8. A feedback resistor R is along with the DC level. To minimize noise amplification, F connected between the OUT pin and the FB pin, and a gain the use of a 1nF feedback capacitor is recommended, as resistor R is connected from the FB pin to GND. The shown in Figure 8 and other circuits with scaling resistors. G resistor values are related to the output voltage by the following relationship: Shunt Reference Operation R = R • (V – 0.4)/(0.4 – I • R ) The circuits shown in Figure 9 and Figure 10 form adjust- F G OUT FB G able shunt references. Along with the external bias resistor The I term represents the FB pin bias current, and can FB R , the LT6650 provides positive or negative reference B generally be neglected when R is 100k or less. For G operation for outputs between 1.4V and 18V (positive or R ≤20k, even worst-case I can be neglected (error G FB negative). Just like a Zener diode, a supply V is required, S somewhat higher in magnitude than the desired reference VOUT VS 10mV/DIV AC RB VOUT = 0.4V • (1 + RF/RG) VOUT 4 5 1nF IN OUT RF 1 IOUT LT6650 FB 10µF 200µA GND RG 100µA 2 6650 F09 6650 F07 Figure 7. Output Response to Current-Sinking Load Step Figure 9. Typical Configuration of LT6650 as Adjustable Positive (100µA to 200µA) Shunt Reference 4 5 1nF 1k VOUT = 0.4V • (1 + RF/RG) IN OUT RF VS VOUT 1 4 5 1nF LT6650 FB 10µF IN OUT RF GND 1 RG 1µF LT6650 FB 1µF 2 GND VOUT 2 RG RB VOUT = –0.4V • (1 + RF/RG) 6650 F08 –VS 6650 F10 Figure 8. Typical Configuration for Output Voltages Figure 10. Typical Configuration of LT6650 as Adjustable Greater than 0.4V Negative Shunt Reference 6650fa 9

LT6650 APPLICATIOUS IUFORWATIOU V . R must be within the following range for proper the parts cycled over the higher temperature extremes OUT B operation (the optimal value depends greatly on the direc- exhibit a broader hysteresis distribution. The worst hys- tion and magnitude of the load current): teresis measurements indicate voltage shifts of less than 1000ppm (0.1%) from their initial value. R > |V – V |/(200µA + 0.4/R ) B S OUT G R < |V – V |/(15µA + 0.4/R ) Limits of Operation B S OUT G The LT6650 is a robust bipolar technology part. ESD Hysteresis clamp diodes are integrated into the design and are Due to various mechanical stress mechanisms inherent to depicted in the Simplified Schematic for reference. Diodes integrated-circuit packaging, internal offsets may not pre- are included between the GND pin and the IN, OUT, and FB cisely recover from variations that occur over tempera- pins to prevent reverse voltage stress on the device. ture, and this effect is referred to as hysteresis. Proprietary Unusual modes of operation that forward-bias any these manufacturing steps minimize this hysteresis, though diodes should limit current to 10mA to avoid permanent some small residual error can occur. Hysteresis measure- damage to the device. The LT6650 is fabricated using a ments for the LT6650 can be seen in Figures 11 and 12. relatively high-voltage process, allowing any pin to inde- Figure 11 presents the worst-case data taken on parts pendently operate at up to 20V with respect to GND. The subjected to thermal cycling between 0°C to 70°C, while part does not include any over voltage protection mecha- Figure 12 shows data for –40°C to 85°C cycling. Units nisms; therefore caution should be exercised to avoid were cycled several times over these temperature ranges inadvertent application of higher voltages in circuits in- and the largest changes are shown. As would be expected, volving high potentials. 6 7 LIGHT COLUMNS 0°C TO 25°C LIGHT COLUMNS –40°C TO 25°C DARK COLUMNS 70°C TO 25°C DARK COLUMNS 85°C TO 25°C 6 5 5 TS 4 TS NI NI F U F U 4 R O 3 R O BE BE 3 M M U 2 U N N 2 1 1 0 0 –400 –200 0 200 400 600 –1000–750–500–250 0 250 500 750 1000 DISTRIBUTION (ppm) DISTRIBUTION (ppm) 6650 F11 6650 F12 Figure 11. Worst-Case 0°C to 70°C Hysteresis Figure 12. Worst-Case –40°C to 85°C Hysteresis 6650fa 10

LT6650 SIW PLIFIED SCHEW ATIC 4 IN IN IN 5 OUT IN 2 GND 1 FB 6650 SS PACKAGE DESCRIPTIOU S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635 Rev B) 0.62 0.95 2.90 BSC MAX REF (NOTE 4) 1.22 REF 1.50 – 1.75 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT 0.30 – 0.45 TYP 0.95 BSC PER IPC CALCULATOR 5 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 1.90 BSC NOTE: (NOTE 3) S5 TSOT-23 0302 REV B 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 6650fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 11 However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT6650 TYPICAL APPLICATIOU Adjustable Micropower “Zener” 2-Terminal Reference CATHODE CATHODE 4 5 IN OUT 1nF RF = LT6650 FB 1 10µF 13.04µVA ≤ ≤ V IZZ ≤≤ 1282V0µA GND RG VZ = 0.4V • (1 + RF/RG) 2 ANODE ANODE 6650 TA02 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1790 Micropower LDO Precision Reference 0.05% Max Sources/Sinks-Current Available in SOT-23 LT1460 Micropower Precision Reference 0.075% Max 10ppm/ºC Available in SOT-23 LT1461 Micropower LDO Low TC Precision Reference 0.04% Max 3ppm/ºC 35µA Supply Current LT1494/LT1495/ Single/Dual/Quad Micropower Op Amps 1.5µA, VOS < 375µV, IB < 1000pA LT1496 LTC1540 Nanopower Comparator with Reference 300nA, Available in 3mm × 3mm DFN Package LTC1798 Micropower LDO Reference 0.15% Max 6.5µA Supply Current LT6700 Micropower Dual Comparator with Reference 6.5µA, Choice of Polarities Available in SOT-23 6650fa 12 Linear Technology Corporation LT/LT 1005 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2003

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT6650IS5#TR LT6650CS5#PBF LT6650CS5#TRMPBF LT6650IS5#TRPBF LT6650CS5#TR LT6650CS5#TRPBF LT6650HS5#TR LT6650HS5#TRMPBF LT6650IS5#TRM LT6650HS5#PBF LT6650HS5#TRPBF LT6650IS5 LT6650CS5 LT6650HS5#TRM LT6650IS5#PBF LT6650CS5#TRM LT6650IS5#TRMPBF LT6650HS5