LT1634 Micropower Precision Shunt Voltage Reference Features Description Initial Voltage Accuracy: 0.05% Low Operating Current: 10µA Low Drift: 10ppm/°C Max Less Than 1Ω Dynamic Impedance Both Commercial and Industrial Temperature Range Parts Are Available n Available in 1.25V, 2.5V, 4.096V and 5V in SO-8 and TO-92 Packages n 1.25V and 2.5V Available in MSOP Package The LT®1634 is a micropower, precision, shunt voltage reference. The bandgap reference uses trimmed precision thin film resistors to achieve 0.05% initial voltage accuracy. Improved curvature correction technique guarantees 10ppm/°C maximum temperature drift. Advances in design, processing and packaging techniques guarantee 10µA operation and low temperature cycling hysteresis. The LT1634 does not require an output compensation capacitor, but is stable with capacitive loads. Low dynamic impedance makes the LT1634 reference easy to use from unregulated supplies. n n n n n Applications The LT1634 reference can be used as a high performance upgrade to the LM185/LM385, LT1004 and LT1034 where lower power and guaranteed temperature drift is required. Portable Meters n Precision Regulators n A/D and D/A Converters nCalibrators n 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 Super Accurate ±4.096V Output References Temperature Drift 5V 45k 2.0 LT1634-4.096 VOUT 4.096V LT1495 – –5V 5V 4 5 IS = 200µA OUTPUT ACCURACY BETTER THAN 0.075% AT ±500µA OUTPUT LTC®1043 6 1µF 15 18 REVERSE VOLTAGE CHANGE (mV) + 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –40 17 –5V 5V – LT1495 1µF + IR = 10µA VOUT = 1.25V –20 40 60 20 0 TEMPERATURE (°C) 80 100 1634 TA02 VOUT –4.096V –5V 1634 TA01 1634ff For more information www.linear.com/LT1634 1 LT1634 Absolute Maximum Ratings (Note 1) Current Operating 1.25V................................................................100mA 2.5V....................................................................50mA 4.096V, 5V..........................................................30mA Forward Current......................................................20mA Operating Temperature Range Commercial.............................................. 0°C to 70°C Industrial..............................................–40°C to 85°C Storage Temperature Range (Note 1)...... –65°C to 150°C Lead Temperature (Soldering, 10 sec).................... 300°C pin configuration BOTTOM VIEW TOP VIEW TOP VIEW DNC* DNC* DNC* GND 1 2 3 4 8 7 6 5 NC*** DNC* VOUT TEST** MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125°C, θJA = 250°C/W DNC* 1 8 NC*** DNC* 2 7 DNC* DNC* 3 6 VOUT GND 4 TEST** VOUT GND 5 TEST** S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, θJA = 190°C/W Z PACKAGE 3-LEAD PLASTIC TO-92 TJMAX = 125°C, θJA = 190°C/W *Connected internally. Do Not Connect external circuitry to these pins. **The TEST pin can be left unconnected or connected to the GND pin (GND pin on Z package, Pin4 on MS8 and S8 packages) *** Not connected internally. order information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LT1634BCMS8-1.25#PBF LT1634BCMS8-1.25#TRPBF LTCV 8-Lead Plastic MSOP LT1634BCMS8-2.5#PBF LT1634BCMS8-2.5#TRPBF LTDF 8-Lead Plastic MSOP LT1634ACS8-1.25#PBF LT1634ACS8-1.25#TRPBF 1634A1 8-Lead Plastic SO LT1634ACS8-2.5#PBF LT1634ACS8-2.5#TRPBF 1634A2 8-Lead Plastic SO LT1634ACS8-4.096#PBF LT1634ACS8-4.096#TRPBF 1634A4 8-Lead Plastic SO LT1634ACS8-5#PBF LT1634ACS8-5#TRPBF 1634A5 8-Lead Plastic SO LT1634AIS8-1.25#PBF LT1634AIS8-1.25#TRPBF 634AI1 8-Lead Plastic SO LT1634AIS8-2.5#PBF LT1634AIS8-2.5#TRPBF 634AI2 8-Lead Plastic SO LT1634AIS8-4.096#PBF LT1634AIS8-4.096#TRPBF 634AI4 8-Lead Plastic SO LT1634AIS8-5#PBF LT1634AIS8-5#TRPBF 634AI5 8-Lead Plastic SO LT1634BCS8-1.25#PBF LT1634BCS8-1.25#TRPBF 1634B1 8-Lead Plastic SO LT1634BCS8-2.5#PBF LT1634BCS8-2.5#TRPBF 1634B2 8-Lead Plastic SO LT1634BCS8-4.096#PBF LT1634BCS8-4.096#TRPBF 1634B4 8-Lead Plastic SO LT1634BCS8-5#PBF LT1634BCS8-5#TRPBF 1634B5 8-Lead Plastic SO LT1634BIS8-1.25#PBF LT1634BIS8-1.25#TRPBF 634BI1 8-Lead Plastic SO LT1634BIS8-2.5#PBF LT1634BIS8-2.5#TRPBF 634BI2 8-Lead Plastic SO LT1634BIS8-4.096#PBF LT1634BIS8-4.096#TRPBF 634BI4 8-Lead Plastic SO LT1634BIS8-5#PBF LT1634BIS8-5#TRPBF 634BI5 8-Lead Plastic SO LT1634CCZ-1.25#PBF LT1634CCZ-1.25#TRPBF 3-Lead Plastic TO-92 LT1634CCZ-2.5#PBF LT1634CCZ-2.5#TRPBF 3-Lead Plastic TO-92 LT1634CCZ-4.096#PBF LT1634CCZ-4.096#TRPBF 3-Lead Plastic TO-92 LT1634CCZ-5#PBF LT1634CCZ-5#TRPBF 3-Lead Plastic TO-92 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/ 2 For more information www.linear.com/LT1634 SPECIFIED TEMPERATURE RANGE 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 1634ff LT1634 available options TEMPERATURE 0°C to 70°C ACCURACY (%) 0.05 TEMPERATURE COEFFICIENT (ppm/°C) 10 –40°C to 85°C 0.05 10 0°C to 70°C 0.05 25 –40°C to 85°C 0.05 25 0°C to 70°C 0.20 25 PACKAGE TYPE S8 LT1634ACS8-1.25 LT1634ACS8-2.5 LT1634ACS8-4.096 LT1634ACS8-5 LT1634AIS8-1.25 LT1634AIS8-2.5 LT1634AIS8-4.096 LT1634AIS8-5 LT1634BCS8-1.25 LT1634BCS8-2.5 LT1634BCS8-4.096 LT1634BCS8-5 LT1634BIS8-1.25 LT1634BIS8-2.5 LT1634BIS8-4.096 LT1634BIS8-5 MS8 LT1634BCMS8-1.25 LT1634BCMS8-2.5 Z LT1634CCZ-1.25 LT1634CCZ-2.5 LT1634CCZ-4.096 LT1634CCZ-5 1.25V Electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Reverse Breakdown Voltage LT1634ACS8/LT1634BCMS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 10µA) LT1634CCZ (IR = 10µA) Reverse Breakdown Change with Current (Note 4) LT1634ACS8 (IR = 10µA) l LT1634AIS8 (IR = 10µA) l LT1634BCS8/LT1634BCMS8 (IR = 10µA) l LT1634BIS8 (IR = 10µA) l LT1634CCZ (IR = 10µA) l 10µA ≤ IR ≤ 2mA l 2mA ≤ IR ≤ 20mA l Minimum Operating Current Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) MIN TYP MAX 1.24937 –0.05 1.24750 –0.20 1.24849 –0.12 1.24781 –0.175 1.24718 –0.225 1.24547 –0.362 1.24531 –0.375 1.250 1.25062 0.05 1.25250 0.20 1.25149 0.12 1.25218 0.175 1.25281 0.225 1.25453 0.362 1.25469 0.375 1 2 8 10 7 1.250 1.250 1.250 1.250 1.250 1.250 0.25 0.30 2 2 l LT1634A, IR = 10µA LT1634B/LT1634C, IR = 10µA 10µA ≤ IR ≤ 2mA Low Frequency Noise (Note 6) IR = 10µA, 0.1Hz ≤ f ≤ 10Hz Hysteresis (Note 7) ∆T = –40°C to 85°C ∆T = 0°C to 70°C l l 4 10 0.125 0.150 10 160 40 10 25 0.5 1.0 UNITS V % V % V % V % V % V % V % mV mV mV mV µA ppm/°C ppm/°C Ω Ω µVP-P ppm ppm 1634ff For more information www.linear.com/LT1634 3 LT1634 2.5V Electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Reverse Breakdown Voltage LT1634ACS8/LT1634BCMS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 10µA) LT1634CCZ (IR = 10µA) Reverse Breakdown Change with Current (Note 4) LT1634ACS8 (IR = 10µA) l LT1634AIS8 (IR = 10µA) l LT1634BCMS8/LT1634BCS8 (IR = 10µA) l LT1634BIS8 (IR = 10µA) l LT1634CCZ (IR = 10µA) l MIN TYP MAX 2.49875 –0.05 2.49500 –0.20 2.49700 –0.12 2.49562 –0.175 2.49437 –0.225 2.49094 –0.362 2.49062 –0.375 2.500 2.50125 0.05 2.50500 0.20 2.50300 0.12 2.50437 0.175 2.50562 0.225 2.50906 0.362 2.50937 0.375 1.5 3.0 8 10 8 10µA ≤ IR ≤ 2mA 2.500 2.500 2.500 2.500 2.500 0.30 0.40 2 2 l 2mA ≤ IR ≤ 20mA l Minimum Operating Current 2.500 l Reverse Dynamic Impedance (Note 5) LT1634A, IR = 10µA LT1634B/LT1634C, IR = 10µA 10µA ≤ IR ≤ 2mA Low Frequency Noise (Note 6) IR = 10µA, 0.1Hz ≤ f ≤ 10Hz 4 10 0.15 0.20 15 Hysteresis (Note 7) ∆T = –40°C to 85°C ∆T = 0°C to 70°C 160 40 Temperature Coefficient (Note 8) l l l 10 25 0.75 1.50 UNITS V % V % V % V % V % V % V % mV mV mV mV µA ppm/°C ppm/°C Ω Ω µVP-P ppm ppm 4.096 electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Reverse Breakdown Voltage LT1634ACS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 20µA) LT1634CCZ (IR = 20µA) Reverse Breakdown Change with Current (Note 4) LT1634ACS8 (IR = 20µA) l LT1634AIS8 (IR = 20µA) l LT1634BCS8 (IR = 20µA) l LT1634BIS8 (IR = 20µA) l LT1634CCZ (IR = 20µA) l 20µA ≤ IR ≤ 2mA l 2mA ≤ IR ≤ 20mA l Minimum Operating Current 4 l MIN TYP MAX 4.09395 –0.05 4.08780 –0.20 4.09108 –0.12 4.08883 –0.175 4.08678 –0.225 4.08115 –0.362 4.08064 –0.375 4.096 4.09805 0.05 4.10419 0.20 4.10091 0.12 4.10317 0.175 4.10522 0.225 4.11085 0.362 4.11137 0.375 1.5 3.0 15 20 15 4.096 4.096 4.096 4.096 4.096 4.096 0.30 0.40 6 6 UNITS V % V % V % V % V % V % V % mV mV mV mV µA 1634ff For more information www.linear.com/LT1634 LT1634 4.096V Electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Temperature Coefficient (Note 8) LT1634A, IR = 20µA LT1634B/LT1634C, IR = 20µA 20µA ≤ IR ≤ 2mA MIN TYP MAX UNITS 10 25 0.75 1.50 ppm/°C ppm/°C Ω Ω µVP-P Low Frequency Noise (Note 6) IR = 20µA, 0.1Hz ≤ f ≤ 10Hz 4 10 0.15 0.20 30 Hysteresis (Note 7) ∆T = –40°C to 85°C ∆T = 0°C to 70°C 160 40 Reverse Dynamic Impedance (Note 5) l l l ppm ppm 5V Electrical characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS Reverse Breakdown Voltage LT1634ACS8/LT1634BCS8/ LT1634AIS8/LT1634BIS8 (IR = 20µA) LT1634CCZ (IR = 20µA) Reverse Breakdown Change with Current (Note 4) LT1634ACS8 (IR = 20µA) l LT1634AIS8 (IR = 20µA) l LT1634BCS8 (IR = 20µA) l LT1634BIS8 (IR = 20µA) l LT1634CCZ (IR = 20µA) l 20µA ≤ IR ≤ 2mA l 2mA ≤ IR ≤ 20mA l Minimum Operating Current MIN TYP MAX 4.99750 –0.05 4.99000 –0.20 4.99400 –0.12 4.99125 –0.175 4.98875 –0.225 498188 –0.362 4.98126 –0.375 5.000 5.00250 0.05 5.01000 0.20 5.00600 0.12 5.00875 0.175 5.01125 0.225 5.01813 0.362 5.01876 0.375 1.5 3.0 15 20 15 5.000 5.000 5.000 5.000 5.000 5.000 0.30 0.40 6 6 l Low Frequency Noise (Note 6) IR = 20µA, 0.1Hz ≤ f ≤ 10Hz 4 10 0.15 0.20 35 Hysteresis (Note 7) ∆T = –40°C to 85°C ∆T = 0°C to 70°C 160 40 Temperature Coefficient (Note 8) Reverse Dynamic Impedance (Note 5) LT1634A, IR = 20µA LT1634B/LT1634C, IR = 20µA 20µA ≤ IR ≤ 2mA l l l Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: If the part is stored outside of the specific operating temperature range, the output may shift due to hysteresis. Note 3: ESD (Electrostatic Discharge) sensitive device. Use proper ESD handling precautions. Note 4: Output requires 0.1µF for operating current greater than 1mA. Note 5: This parameter is guaranteed by “reverse breakdown change with current” test. Note 6: Peak-to-peak noise is measured with a single highpass filter at 0.1Hz and 2-pole lowpass filter at 10Hz. 10 25 0.75 1.50 UNITS V % V % V % V % V % V % V % mV mV mV mV µA ppm/°C ppm/°C Ω Ω µVP-P ppm ppm Note 7: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25°C but the IC is cycled to 85°C or –40°C before successive measurements. Hysteresis is roughly proportional to the square of the temperature change. Hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. Note 8: Temperature coefficient is calculated from the minimum and maximum output voltage measured at TMIN, Room and TMAX as follows: TC = (VOMAX – VOMIN)/(TMAX – TMIN) Incremental slope is also measured at 25°C. For more information www.linear.com/LT1634 1634ff 5 LT1634 1.25v Typical Performance Characteristics 2.0 REVERSE VOLTAGE CHANGE (mV) TA = –40°C TO 85°C REVERSE CURRENT (µA) 8 6 4 2 0 0.8 0.4 1.2 REVERSE VOLTAGE (V) 0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –40 1.6 4 10µA 100µA 200µA 500µA 1mA 40 20 0 TEMPERATURE (°C) –20 60 Reverse Dynamic Impedance 1 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 Forward Characteristics 1.2 TA = 25°C 10 0.1 1 10 REVERSE CURRENT (mA) 1634-1.25 G03 Dynamic Impedance vs Frequency DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) 1 0 0.01 10000 TA = 25°C f = 25Hz 0.1 0.001 2 1634-1.25 G02 1634-1.25 G01 100 TA = –40°C TO 85°C 3 80 TA = 25°C 1000 100 IR = 10µA COUT = 0µF IR = 10µA COUT = 0.022µF 10 IR = 100µA COUT = 0.47µF IR = 100µA COUT = 0µF 1 0.1 0.01 100 FORWARD VOLTAGE (V) 10 Reverse Voltage Change vs Current Temperature Drift REVERSE VOLTAGE CHANGE (mV) Reverse Characteristics 0.1 1 10 FREQUENCY (kHz) 0.8 0.4 0 0.01 100 0.1 1 10 FORWARD CURRENT (mA) 1634-1.25 G05 1634-1.25 G04 0.1Hz to 10Hz Noise 100 1634-1.25 G06 Response Time Response Time 8 NOISE VOLTAGE (µV/DIV) TA = –40°C TO 85°C 6 IR = 10µA 1.5V 1V 0.5V 0V 4 2 OUT 5V 0V 0 –2 IN IR = 10µA COUT = 0 –4 200µs/DIV 1634-1.25 G08 1.5V 1V 0.5V 0V OUT 5V 0V IN IR = 10µA COUT = 0.1µF 20ms/DIV 1634-1.25 G09 –6 –8 0 10 20 30 40 50 TIME (SEC) 60 70 1634-1.25 G07 6 1634ff For more information www.linear.com/LT1634 LT1634 2.5v Typical Performance Characteristics 4 TA = –40°C TO 85°C REVERSE VOLTAGE CHANGE (mV) 8 6 4 2 0 0 0.5 1.5 2.0 1.0 REVERSE VOLTAGE (V) 2.5 3 2 1 0 –1 –2 –3 –4 –40 3.0 6 10µA 100µA 200µA 500µA 1mA 40 20 0 TEMPERATURE (°C) –20 60 Reverse Dynamic Impedance DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) 1 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 10 5 0 –5 IR = 10µA COUT = 0µF 100 IR = 10µA COUT = 0.068µF 10 IR = 100µA COUT = 0µF 1 0.1 0.01 TA = 25°C 0.1 IR = 100µA COUT = 0.47µF 1 10 FREQUENCY (kHz) 100 0.8 0.4 0 0.01 0.1 1 10 FORWARD CURRENT (mA) 1634-2.5 G05 Response Time 3V 2V 1V 0V 5V 0V 5V 0V 200µs/DIV 100 1634-2.5 G06 3V 2V 1V 0V IR = 10µA COUT = 0 –10 100 Forward Characteristics Response Time TA = –40°C TO 85°C IR = 10µA 0.1 1 10 REVERSE CURRENT (mA) 1000 0.1Hz to 10Hz Noise NOISE VOLTAGE (µV/DIV) 2 1.2 1635-2.5 G04 15 3 TA = 25°C 1 20 4 Dynamic Impedance vs Frequency 10 0.1 0.001 5 1634-2.5 G03 10000 TA = 25°C f = 25Hz TA = –40°C TO 85°C 1634-2.5 G02 1634-2.5 G01 100 Reverse Voltage Change vs Current 0 0.01 80 FORWARD VOLTAGE (V) REVERSE CURRENT (µA) 10 Temperature Drift REVERSE VOLTAGE CHANGE (mV) Reverse Characteristics 1634-2.5 G08 IR = 10µA COUT = 0.1µF 20ms/DIV 1634-2.5 G09 –15 –20 0 10 20 30 40 50 60 70 80 TIME (SEC) 1634-2.5 G07 1634ff For more information www.linear.com/LT1634 7 LT1634 4.096v Typical Performance Characteristics 6 REVERSE VOLTAGE CHANGE (mV) TA = –40°C to 85°C REVERSE CURRENT (µA) 16 12 8 4 0 0 2 3 4 REVERSE VOLTAGE (V) 1 4 2 0 –2 –4 –6 –40 5 5 20µA 100µA 200µA 500µA 1mA –20 0 40 20 TEMPERATURE (°C) 1634-4 G01 DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) 10 1 0.1 0.001 NOISE VOLTAGE (µV/DIV) 2 1 0 0.01 80 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 IR = 20µA COUT = 0µF 100 IR = 20µA COUT = 0.033µF 10 IR = 100µA COUT = 0.33µF IR = 100µA COUT = 0µF 1 0.1 0.01 0.1 1 10 FREQUENCY (kHz) 100 20 10 0 –10 TA = 25°C 0.8 0.4 0 0.01 0.1 1 10 FORWARD CURRENT (mA) 1634-4 G05 Response Time 6V 4V 2V 0V 10V 0V 10V 0V 500µs/DIV 100 1634-2.5 G06 6V 4V 2V 0V IR = 20µA COUT = 0 –20 100 Forward Characteristics Response Time TA = –40°C TO 85°C IR = 20µA 0.1 1 10 REVERSE CURRENT (mA) 1634-4 G03 TA = 25°C 1000 0.1Hz to 10Hz Noise 30 3 1.2 1635-4 G04 40 4 Dynamic Impedance vs Frequency 10000 TA = 25°C f = 25Hz TA = –40°C TO 85°C 1634-4 G02 Reverse Dynamic Impedance 100 60 FORWARD VOLTAGE (V) 20 Reverse Voltage Change vs Current Temperature Drift REVERSE VOLTAGE CHANGE (mV) Reverse Characteristics 1634-4 G07 IR = 20µA COUT = 0.1µF 20ms/DIV 1634-4 G08 –30 –40 0 10 20 30 40 50 TIME (SEC) 60 70 80 1634-4 G06 8 1634ff For more information www.linear.com/LT1634 LT1634 5v Typical Performance Characteristics 8 TA = –40°C TO 85°C REVERSE VOLTAGE CHANGE (mV) 16 12 8 4 0 0 2 3 4 REVERSE VOLTAGE (V) 1 5 6 4 2 0 –2 –4 –6 –8 –40 6 5 20µA 100µA 200µA 500µA 1mA –20 0 40 20 TEMPERATURE (°C) 60 1634-5 G01 DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) 1 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 1000 IR = 20µA COUT = 0µF 100 10 IR = 100µA COUT = 0µF 1 0.1 0.01 0.1 IR = 20µA COUT = 0.1µF IR = 100µA COUT = 0.22µF 1 10 FREQUENCY (kHz) 100 0.8 0.4 0 0.01 10 0 –10 6V 4V 2V 0V 10V 0V 10V 0V 500µs/DIV 100 Response Time 6V 4V 2V 0V IR = 20µA COUT = 0 –20 0.1 1 10 FORWARD CURRENT (mA) 1634-2.5 G06 Response Time 20 100 TA = 25°C 1634-5 G05 0.1Hz to 10Hz Noise TA = –40°C TO 85°C IR = 20µA 0.1 1 10 REVERSE CURRENT (mA) Forward Characteristics 1.2 1635-5 G04 NOISE VOLTAGE (µV/DIV) 1 TA = 25°C 10 30 2 Dynamic Impedance vs Frequency TA = 25°C f = 25Hz 40 3 1634-5 G03 10000 0.1 0.001 4 1634-5 G02 Reverse Dynamic Impedance 100 TA = –40°C TO 85°C 0 0.01 80 FORWARD VOLTAGE (V) REVERSE CURRENT (µA) 20 Reverse Voltage Change vs Current Temperature Drift REVERSE VOLTAGE CHANGE (mV) Reverse Characteristics 1634-5 G07 IR = 20µA COUT = 0.1µF 20ms/DIV 1634-5 G08 –30 –40 0 10 20 30 40 50 TIME (SEC) 60 70 80 1634-5 G06 1634ff For more information www.linear.com/LT1634 9 LT1634 Applications Information The reverse characteristics of the LT1634 behave like a resistor in parallel with a Zener diode. This simple, well behaved characteristic is important to the proper operation of circuits like Figure 1. The adjustable output voltage reference depends upon positive feedback from the LT1495’s output to start-up and regulate the bias current for the LT1634. VIN ≥ 10.5V – 1.25V V RB = OUT 10µA + VOUT 1.5V TO 10V LT1495 LT1634-1.25 – R1 50k TO 1.75M R2 250k 1634 F01 Figure 1. Adjustable Output Voltage Reference Typical Applications The LT1634-5 Generates the LTC1448 Dual 12-Bit DAC’s Reference and Supply Voltage Reference for Micropower A/D Converter 5V 7.5V TO 12V 18k VIN LTC1286 1 2 LT1634-4.096 0.1µF 3 4 VREF VCC +IN CLK –IN DOUT GND CS/SHDN 3.48k 8 7 6 5 0.1µF µC/µP SERIAL INTERFACE LT1634-5 µC/µP SERIAL INTERFACE 2 3 4 1634 TA03 10 LTC1448 1 5V 0.1µF CLK VOUTB DIN VCC CS/LD REF GND VOUTA 8 7 6 5 VOUTB 0.1µF VOUTA 1634 TA04 1634ff For more information www.linear.com/LT1634 LT1634 package description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 7 8 .245 MIN .160 ±.005 5 6 NOTE: 1. DIMENSIONS IN .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 3 2 4 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) INCHES (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) 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE .004 – .010 (0.101 – 0.254) 0°– 8° TYP SO8 REV G 0212 .016 – .050 (0.406 – 1.270) .050 (1.270) BSC .014 – .019 (0.355 – 0.483) TYP MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev G) 0.889 ±0.127 (.035 ±.005) 5.10 (.201) MIN 3.20 – 3.45 (.126 – .136) 3.00 ±0.102 (.118 ±.004) (NOTE 3) 0.65 (.0256) BSC 0.42 ± 0.038 (.0165 ±.0015) TYP 8 7 6 5 0.52 (.0205) REF NOTE: 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 RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ±0.102 (.118 ±.004) (NOTE 4) 4.90 ±0.152 (.193 ±.006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ±0.152 (.021 ±.006) DETAIL “A” 1 1.10 (.043) MAX 2 3 4 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.65 (.0256) BSC 0.1016 ±0.0508 (.004 ±.002) MSOP (MS8) 0213 REV G 1634ff For more information www.linear.com/LT1634 11 LT1634 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DWG # 05-08-1410 Rev C) .180 ± .005 (4.572 ± 0.127) .060 ± .005 (1.524± 0.127) DIA .90 (2.286) NOM .180 ± .005 (4.572 ± 0.127) .500 (12.70) MIN .050 UNCONTROLLED (1.270) LEAD DIMENSION MAX .016 ± .003 (0.406 ± 0.076) .050 (1.27) BSC 5° NOM .015 ± .002 (0.381 ± 0.051) Z3 (TO-92) 1008 REV C .098 +.016/–.04 (2.5 +0.4/–0.1) 2 PLCS BULK PACK TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION .060 ± .010 (1.524 ± 0.254) 3 2 1 .140 ± .010 (3.556 ± 0.127) 10° NOM 12 1634ff For more information www.linear.com/LT1634 LT1634 Revision History (Revision history begins at Rev F) REV DATE DESCRIPTION F 10/14 Web Links Added NC Pins Identified on MS8 and S8 Package Revision History Added PAGE NUMBER All 2 13 1634ff 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. For more information www.linear.com/LT1634 13 LT1634 Typical Applications Single Cell Li-Ion Battery Supervisory Circuit (IQ = 20µA) OFF CHARGER VBAT 1.75V RS 51k 5% – A2 1/4 LT1496 + + A1 1/4 LT1496 R1 500k 0.1% – VBAT + 1.25V A3 1/4 LT1496 RH1 10M 5% D1 RH2 10M 5% D2 R3 1.75M 0.1% A T0 LOAD RSW 1M 5% BATTERY – A4 1/4 LT1496 – + R2 1.25M 0.1% LT1634-1.25 SW R4 1.25M 0.1% 1634 TA05 D1, D2: 1N458 R1 TO R4: CAR6 SERIES IRC (512) 992-7900 Micropower Voltage and Current Reference R3 249k 0.1% ZTX214C R4 24k 5% – 2 AAA ALKALINE CELLS 1/2 LT1495 R1 TO R3: MAR5 SERIES, IRC (512) 992-7900 + 1/2 LT1495 – + LT1634 1.25V IOUT 1µA COM VOUT 1.5V R1 200k 0.1% R2 1M 0.1% 1634 TA06 Related Parts PART NUMBER DESCRIPTION COMMENTS LTC1440 Micropower Comparator with Reference 3.7µA Max Supply Current, 1% 1.182V Reference, MSOP, PDIP and SO-8 Packages LT1460 Micropower Series Reference 0.075% Max, 10ppm/°C Max Drift, 2.5V, 5V and 10V Versions, MSOP, PDIP, SO-8, SOT-23 and TO-92 Packages LT1495 1.5µA Precision Rail-to-Rail Dual Op Amp 1.5µA Max Supply Current, 100pA Max IOS LTC1540 Nanopower Comparator with Reference 600nA Max Supply Current, 2% 1.182V Reference, MSOP and SO-8 Packages 14 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1634 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT1634 1634ff LT 1014 REV F • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998