Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp FEATRES Rail-to-Rail Input and Output Micropower: 5µA I Q, 44V Supply MSOP Package Over-The-Top TM : Input Common Mode Range Extends 44V Above V EE, Independent of V CC Low Input Offset Voltage: 225µV Max Specified on 3V, 5V and ±5V Supplies High Output Current: 8mA Output Shutdown Output Drives,pF with Output Compensation Reverse Battery Protection to 27V High Voltage Gain: 2V/mV High CMRR: db 22kHz Gain-Bandwidth Product APPLICATIO S Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MX Amplifiers 4mA to 2mA Transmitters DESCRIPTIO The LT 636 op amp operates on all single and split supplies with a total voltage of 2.7V to 44V drawing less than 5µA of quiescent current. The can be shut down, making the output high impedance and reducing the quiescent current to 4µA. The has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode, even when operating on a 3V supply. The output swings to both supplies. nlike most micropower op amps, the can drive heavy loads; its rail-to-rail output drives 8mA. The is unity-gain stable into all capacitive loads up to,pf when a.22µf and 5Ω compensation network is used. The is reverse supply protected: it draws no current for reverse supply up to 27V. Built-in resistors protect the inputs for faults below the negative supply up to 22V. There is no phase reversal of the output for inputs 5V below V EE or 44V above V EE, independent of V CC. The op amp is available in the 8-pin MSOP, PDIP and SO packages., LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO SHDN Over-The-Top Current Source with Shutdown R* LT4-.2 M *OPTIONAL FOR LOW OTPT CRRENTS R 4V TO 44V J76 I OT =.2 R I OT e.g., ma = 2Ω 636 TA INPT BIAS CRRENT (na) Input Bias Current vs Common Mode Voltage 5 3 4 3 2 4. V S = 5V, V T A = 55 C T A = 25 C T A = 25 C 4.4 4.8 5.2 2 3 4 5 COMMON MODE VOLTAGE (V) 636 G3
ABSOLTE MAXIMM RATINGS W W W Total Supply Voltage (V to V )... 44V Input Differential Voltage... 44V Input Current... ±25mA Shutdown Pin Voltage Above V... 32V Shutdown Pin Current... ±ma Output Short-Circuit Duration (Note 2)...Continuous (Note ) Operating Temperature Range... 4 C to 85 C Specified Temperature Range (Note 3).. 4 C to 85 C Junction Temperature... 5 C Storage Temperature Range... 65 C to 5 C Lead Temperature (Soldering, sec)... 3 C PACKAGE/ORDER INFORMATION NLL IN 2 IN 3 V 4 TOP VIEW 8 NLL 7 V 6 OT 5 SHDN MS8 PACKAGE 8-LEAD PLASTIC MSOP T JMAX = 5 C, θ JA = 25 C/ W Consult factory for Military grade parts. W ORDER PART NMBER CMS8 MS8 PART MARKING LTCL NLL IN 2 IN 3 V 4 TOP VIEW 8 7 6 5 NLL V OT SHDN N8 PACKAGE 8-LEAD PLASTIC DIP S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = 5 C, θ JA = 3 C/ W (N8) T JMAX = 5 C, θ JA = 9 C/ W (S8) ORDER PART NMBER CN8 CS8 IN8 IS8 S8 PART MARKING 636 636I 3V, 5V ELECTRICAL CHARACTERISTICS V S = 3V, V; V S = 5V, V; V CM = V OT = half supply, Pin 5 = open or V EE, Pins and 8 open, T A = 25 C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage N8 Package 5 225 µv C T A 7 C 4 µv 4 C T A 85 C 55 µv 2 S8 Package 5 225 µv C T A 7 C 6 µv 4 C T A 85 C 75 µv MS8 Package 5 225 µv C T A 7 C 7 µv 4 C T A 85 C 85 µv Input Offset Voltage Drift (Note 8) N8 Package, 4 C T A 85 C 5 µv/ C S8 Package, 4 C T A 85 C 2 8 µv/ C MS8 Package, 4 C T A 85 C 2 µv/ C I OS Input Offset Current..8 na V CM = 44V (Note 4).6 µa I B Input Bias Current 5 8 na V CM = 44V (Note 4) 3 6 µa V S = V. na Input Noise Voltage.Hz to Hz.7 µv P-P e n Input Noise Voltage Density f = khz 52 nv/ Hz i n Input Noise Current Density f = khz.35 pa/ Hz
3V, 5V ELECTRICAL CHARACTERISTICS V S = 3V, V; V S = 5V, V; V CM = V OT = half supply, Pin 5 = open or V EE, Pins and 8 open, T A = 25 C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS R IN Input Resistance Differential 6 MΩ Common Mode, V CM = V to 44V 7 5 MΩ C IN Input Capacitance 4 pf Input Voltage Range 44 V CMRR Common Mode Rejection Ratio V CM = V to V CC V 84 db (Note 4) V CM = V to 44V (Note 7) 86 98 db A VOL Large-Signal Voltage Gain V S = 3V, V O = 5mV to 2.5V, R L = k 2 3 V/mV V S = 3V, C T A 7 C 33 V/mV V S = 3V, 4 C T A 85 C V/mV V S = 5V, V O = 5mV to 4.5V, R L = k 4 2 V/mV V S = 5V, C T A 7 C 25 V/mV V S = 5V, 4 C T A 85 C 2 V/mV V OL Output Voltage Swing LOW No Load 2 mv I SINK = 5mA 48 875 mv V S = 5V, I SINK = ma 86 6 mv V OH Output Voltage Swing HIGH V S = 3V, No Load 2.95 2.985 V V S = 3V, I SORCE = 5mA 2.55 2.8 V V S = 5V, No Load 4.95 4.985 V V S = 5V, I SORCE = ma 4.3 4.75 V I SC Short-Circuit Current (Note 2) V S = 3V, Short to GND 7 5 ma V S = 3V, Short to V CC 2 42 ma V S = 5V, Short to GND 2 25 ma V S = 5V, Short to V CC 25 5 ma PSRR Power Supply Rejection Ratio V S = 2.7V to 2.5V, V CM = V O = V 9 3 db Reverse Supply Voltage I S = µa 27 4 V I S Supply Current (Note 5) 42 55 µa 6 µa Supply Current, SHDN V PIN5 = 2V, No Load (Note 5) 4 2 µa I SD Shutdown Pin Current V PIN5 =.3V, No Load (Note 5).5 5 na V PIN5 = 2V, No Load (Note 4). 5 µa Output Leakage Current V PIN5 = 2V, No Load (Note 5).5 µa Maximum Shutdown Pin Current V PIN5 = 32V, No Load (Note 4) 27 5 µa t ON Turn-On Time V PIN5 = 5V to V, R L = k 2 µs t OFF Turn-Off Time V PIN5 = V to 5V, R L = k 2.5 µs GBW Gain Bandwidth Product f = khz 2 khz (Note 4) C T A 7 C khz 4 C T A 85 C 9 khz SR Slew Rate A V =, R L =.35.7 V/µs (Note 6) C T A 7 C.3 V/µs 4 C T A 85 C.3 V/µs 3
±5V ELECTRICAL CHARACTERISTICS V S = ±5V, V CM = V, V OT = V, Pin 5 = open or V EE, Pins and 8 open, T A = 25 C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage N8 Package 45 µv C T A 7 C 55 µv 4 C T A 85 C 7 µv S8 Package 45 µv C T A 7 C 75 µv 4 C T A 85 C 9 µv MS8 Package 45 µv C T A 7 C 85 µv 4 C T A 85 C µv Input Offset Voltage Drift (Note 8) N8 Package, 4 C T A 85 C 4 µv/ C S8 Package, 4 C T A 85 C 2 8 µv/ C MS8 Package, 4 C T A 85 C 2 µv/ C I OS Input Offset Current.2. na I B Input Bias Current 4 na Input Noise Voltage.Hz to Hz µv P-P e n Input Noise Voltage Density f = khz 52 nv/ Hz i n Input Noise Current Density f = khz.35 pa/ Hz R IN Input Resistance Differential 5.2 3 MΩ Common Mode, V CM = 5V to 4V 2 MΩ C IN Input Capacitance 4 pf Input Voltage Range 5 29 V CMRR Common Mode Rejection Ratio V CM = 5V to 29V 86 3 db A VOL Large-Signal Voltage Gain V O = ±4V, R L = k 5 V/mV C T A 7 C 75 V/mV 4 C T A 85 C 5 V/mV V OL Output Voltage Swing LOW No Load 4.997 4.95 V I SINK = 5mA 4.5 4.7 V I SINK = ma 4.25 3.35 V V OH Output Voltage Swing HIGH No Load 4.9 4.975 V I SORCE = 5mA 4.5 4.75 V I SORCE = ma 4.3 4.65 V I SC Short-Circuit Current (Note 2) Short to GND ±8 ±3 ma C T A 7 C ±5 ma 4 C T A 85 C ± ma PSRR Power Supply Rejection Ratio V S = ±.35V to ±22V 9 4 db I S Supply Current 5 7 µa 85 µa Positive Supply Current, SHDN V PIN5 = 2V, V S = ±22V, No Load 2 3 µa I SHDN Shutdown Pin Current V PIN5 = 2.7V, V S = ±22V, No Load.7 5 na V PIN5 = 2V, V S = ±22V, No Load.2 8 µa Maximum Shutdown Pin Current V PIN5 = 32V, V S = ±22V 27 5 µa Output Leakage Current V PIN5 = 2V, V S = ±22V, No Load. 2 µa GBW Gain Bandwidth Product f = khz 25 22 khz C T A 7 C khz 4 C T A 85 C khz 4
±5V ELECTRICAL CHARACTERISTICS V S = ±5V, V CM = V, V OT = V, Pin 5 = open or V EE, Pins and 8 open, T A = 25 C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS SR Slew Rate A V =, R L =, V O = ±V Measured at ±5V.375.75 V/µs C T A 7 C.33 V/µs 4 C T A 85 C.3 V/µs The denotes specifications that apply over the full specified temperature range. Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: The C is guaranteed to meet specified performance from C to 7 C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at 4 C and 85 C. The I is guaranteed to meet the extended temperature limits. Note 4: V S = 5V limits are guaranteed by correlation to V S = 3V, and V S = ±5V or V S = ±22V tests. Note 5: V S = 3V limits are guaranteed by correlation to V S = 5V, and V S = ±5V or V S = ±22V tests. Note 6: Guaranteed by correlation to slew rate at V S = ±5V, and GBW at V S = 3V and V S = ±5V tests. Note 7: This specification implies a typical input offset voltage of 6µV at V CM = 44V and a maximum input offset voltage of 3mV at V CM = 44V. Note 8: This parameter is not % tested. TYPICAL PERFOR A CE CHARACTERISTICS SPPLY CRRENT (µa) 8 7 6 T A = 25 C 5 4 T A = 55 C T A = 25 C 3 2 W Supply Current vs Supply Voltage Minimum Supply Voltage 3 5 5 2 25 3 35 4 45 2 3 4 TOTAL SPPLY VOLTAGE (V) TOTAL SPPLY VOLTAGE (V) 636 G CHANGE IN INPT OFFSET VOLTAGE (µv) 3 2 T A = 25 C 2 T A = 55 C T A = 25 C 636 G2 5 INPT BIAS CRRENT (na) 5 3 4 3 2 4. Input Bias Current vs Common Mode Voltage V S = 5V, V T A = 55 C T A = 25 C T A = 25 C 4.4 4.8 5.2 2 3 4 5 COMMON MODE VOLTAGE (V) 636 G3 OTPT SATRATION VOLTAGE (V). Output Saturation Voltage vs Load Current (Output High) V S = 5V V OD = 3mV T A = 25 C T A = 25 C T A = 55 C..... SORCING LOAD CRRENT (ma) 636 G4 OTPT SATRATION VOLTAGE (V).. Output Saturation Voltage vs Load Current (Output Low) V S = 5V V OD = 3mV T A = 25 C T A = 25 C T A = 55 C..... SINKING LOAD CRRENT (ma) 636 G5 OTPT SATRATION VOLTAGE (mv) 9 8 7 6 5 4 3 2 Output Saturation Voltage vs Input Overdrive NO LOAD OTPT HIGH OTPT LOW 2 3 4 5 6 7 8 9 INPT OVERDRIVE (mv) 636 G6 5
TYPICAL PERFOR A CE CHARACTERISTICS W NOISE VOLTAGE (4nV/DIV).Hz to Hz Noise Voltage 2 3 4 5 6 7 8 9 TIME (SEC) INPT NOISE VOLTAGE DENSITY (nv/ Hz) 8 7 6 5 4 3 Noise Voltage Density vs Frequency INPT NOISE CRRENT DENSITY (pa/ Hz) Input Noise Current vs Frequency.35.3.25.2.5..5 636 G7 636 G8 635 G9 GAIN (db) 7 6 5 4 3 2 2 3 k Open-Loop Gain and Phase Shift vs Frequency 8 6 4 PHASE 2 GAIN 2 4 6 8 k k M 636 G PHASE SHIFT (DEG) GAIN-BANDWIDTH PRODCT (khz) 26 24 22 2 8 6 4 5 Gain-Bandwidth Product vs Temperature f = khz V S = ±.5V V S = ±5V 25 25 5 75 25 TEMPERATRE ( C) 636 G SLEW RATE (V/µs).2...9.8.7.6.5.4 5 Slew Rate vs Temperature RISING, V S = ±.5V RISING, V S = ±5V FALLING, V S = ±5V FALLING, V S = ±.5V 25 25 5 75 25 TEMPERATRE ( C) 636 G2 GAIN-BANDWIDTH PRODCT (khz) 3 28 26 24 22 2 Gain-Bandwidth Product and Phase Margin vs Supply Voltage R L = k f = khz PHASE MARGIN GAIN BANDWIDTH 5 4 3 PHASE MARGIN (DEG) COMMON MODE REJECTION RATIO (db) 2 9 8 7 6 5 4 3 CMRR vs Frequency V S = ±.5V V S = ±5V POWER SPPLY REJECTION RATIO (db) 8 7 6 5 4 3 2 PSRR vs Frequency NEGATIVE SPPLY POSITIVE SPPLY 8 2 5 5 2 25 3 35 4 45 TOTAL SPPLY VOLTAGE (V) 2 K K K 2 k k k 636 G3 636 G4 636 G5 6
TYPICAL PERFOR A CE CHARACTERISTICS W GAIN-BANDWIDTH PRODCT (khz) 45 4 35 3 25 2 5 Gain-Bandwidth Product and Phase Margin vs Load Resistance GAIN BANDWIDTH PHASE MARGIN 8 7 6 5 4 3 2 PHASE MARGIN (DEG) OTPT IMPEDANCE (Ω) Output Impedance vs Frequency k k A V = A V = A V = OTPT SWING (VP-P) 35 3 25 2 5 5 ndistorted Output Swing vs Frequency V s = ±5V V s = ±2.5V DISTORTION % A V = 5 k k LOAD RESISTANCE (Ω) k. k k k k k k 636 G6 635 G7 635 G8 OTPT STEP (V) 8 6 4 2 2 4 6 8 Settling Time to.% vs Output Step V S = ±5V A V = A V = A V = A V = 2 4 6 8 2 4 6 SETTLING TIME (µs) 636 G9 OVERSHOOT (%) 9 8 7 6 5 4 3 2 Capacitive Load Handling, Overshoot vs Capacitive Load I SORCE = 4µA NO OTPT COMPENSATION A V = A V = 5 A V = 2 A V = CAPACITIVE LOAD (pf) 636 G2 THD NOISE (%)... Total Harmonic Distortion Noise vs Frequency V S = 3V, V V OT = 2V P-P V CM =.2V R L = 5k A V = A V = k k 636 G2 THD NOISE (%)... Total Harmonic Distortion Noise vs Load Resistance V S = 3V, V V IN =.5V TO 2.5V V S = 3V TOTAL A V = V IN = 2V P-P AT khz V S = ±.5V V IN = ±V V S = 3V, V V IN =.2V TO 2.2V k k k LOAD RESISTANCE TO GROND (Ω) 636 G22 THD NOISE (%).. Total Harmonic Distortion Noise vs Output Voltage R L = k V CM = HALF SPPLY f = khz A V = V S = ±.5V A V = V S = ±.5V A V = V S = 3V, V A V = V S = 3V, V. 2 3 OTPT VOLTAGE (V P-P ) 636 G23 7
TYPICAL PERFOR A CE CHARACTERISTICS W Open-Loop Gain Large-Signal Response Small-Signal Response CHANGE IN INPT OFFSET VOLTAGE (µv/div) A C B A B C A: R L = 2k B: R L = k C: R L = 5k V S = ±5V V V V OTPT VOLTAGE (5V/DIV) 636 G24 V S = ±5V A V = 636 G25 V S = ±5V A V = 636 G26 APPLICATIONS INFORMATION Supply Voltage W The positive supply pin of the should be bypassed with a small capacitor (about.µf) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The is protected against reverse battery voltages up to 27V. In the event a reverse battery condition occurs, the supply current is less than na. When operating the on total supplies of 2V or more, the supply must not be brought up faster than µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. 5Ω of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The has two input stages, NPN and PNP (see Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about.8v or more below V, the PNP input stage is active and the input bias current is typically 4nA. When the input voltage is about.5v or less from V, the NPN input stage is operating and the input bias current is typically na. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V. The input offset voltage of the NPN stage is untrimmed and is typically 6µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the to operate with either or both of its inputs above V. At about.3v above V the NPN input transistor is fully saturated and the input bias current is typically 3µA at room temperature. The input offset voltage is typically 6µV when operating above V. The will operate with its input 44V above V regardless of V. The inputs are protected against excursions as much as 22V below V by an internal k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 5V below V. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the is affected by input overdrive as shown in the typical performance curves. When monitoring voltages within mv of V, gain should be taken to keep the output from clipping. The output of the can be pulled up to 27V beyond V with less than na of leakage current, provided that V is less than.5v. 8
APPLICATIONS INFORMATION W The normally reverse biased substrate diode from the output to V will cause unlimited currents to flow when the output is forced below V. If the current is transient and limited to ma, no damage will occur. The is internally compensated to drive at least 2pF of capacitance under any output loading conditions. A.22µF capacitor in series with a 5Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to,pf, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V.8V). See the Typical Performance Characteristics curves. Gain The open-loop gain is less sensitive to load resistance when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. Shutdown The can be shut down two ways: using the shutdown pin or bringing V to within.5v of V. When V is brought to within.5v of V both the supply current and output leakage current drop to less than na. When the shutdown pin is brought.2v above V, the supply current drops to about 4µA and the output leakage current is less than µa, independent of V. In either case the input bias current is less than.na (even if the inputs are 44V above the negative supply). The shutdown pin can be taken up to 32V above V. The shutdown pin can be driven below V, however the pin current through the substrate diode should be limited with an external resistor to less than ma. Input Offset Nulling The input offset voltage can be nulled by placing a k potentiometer between Pins and 8 with its wiper to V (see Figure ). The null range will be at least ±mv. k V 636 AI Figure. Input Offset Nulling 8 9
TYPICAL APPLICATIONS MX Amplifier MX Amplifier Waveforms V IN 5V SHDN VOT V IN2 5V SHDN V S = 5V V IN =.2kHz AT 4V P-P, V IN2 = 2.4kHz AT 2V P-P INPT SELECT = 2Hz AT 5V P-P INPT SELECT 74HC4 636 TA5 Optional Output Compensation for Capacitive Loads Greater Than 2pF V IN C L,pF.22µF 5Ω 636 TA9 W SI PLIFIED SCHEMATIC W Q D D2 Q3 Q9 7 V Q25 SHDN 5 R M Q3 2µA R2 3k Q2 IN IN 2 3 R3 k R4 k Q Q9 Q Q2 Q4 Q5 Q6 Q7 Q8 D3 Q2 Q2 Q22 Q23 Q24 6 OT Q26 Q4 Q5 Q6 Q7 Q8 D4 D5 NLL R5 R6 4k 4k 8 NLL R7 3Ω R8 3Ω 636 SS 4 V
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted..7 (.8).2 ±.6 (.53 ±.5) 6 TYP SEATING PLANE MS8 Package 8-Lead Plastic MSOP (LTC DWG # 5-8-66).4 ±.6 (.2 ±.5).2 (.3) REF.256 (.65) TYP.34 ±.4 (.86 ±.2).6 ±.4 (.5 ±.2) * DIMENSION DOES NOT INCLDE MOLD FLASH, PROTRSIONS OR GATE BRRS. MOLD FLASH, PROTRSIONS OR GATE BRRS SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH OR PROTRSIONS. INTERLEAD FLASH OR PROTRSIONS SHALL NOT EXCEED.6" (.52mm) PER SIDE.8 ±.4* (3. ±.2).92 ±.4 (4.88 ±.) 8 7 6 5 2 3 4.8 ±.4** (3. ±.2) MSOP (MS8) 97.3.325 (7.62 8.255).45.65 (.43.65) N8 Package 8-Lead PDIP (Narrow.3) (LTC DWG # 5-8-5).3 ±.5 (3.32 ±.27).4* (.6) MAX 8 7 6 5.9.5 (.229.38).325.35.5.889 8.255.38 ( ).65 (.65) TYP. ±. (2.54 ±.254) *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.254mm).25 (3.75) MIN.8 ±.3 (.457 ±.76).2 (.58) MIN.255 ±.5* (6.477 ±.38) 2 3 4 N8 97.8. (.23.254)..2 (.254.58) 45 8 TYP S8 Package 8-Lead Plastic Small Outline (Narrow.5) (LTC DWG # 5-8-6).53.69 (.346.752).4. (..254).89.97* (4.8 5.4) 8 7 6 5.6.5.46.27.4.9 (.355.483) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.254mm) PER SIDE.5 (.27) TYP.228.244 (5.79 6.97) 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. 2 3 4.5.57** (3.8 3.988) SO8 996
TYPICAL APPLICATIONS Over-The-Top Comparator with Hysteresis M 3V TO 44V Self-Buffered Micropower Reference 4V TO 44V IN (V TO 44V) IN2 (V TO 44V) k k HYSTERESIS = V CC M 2N587 2N52 636 TA3 M M V OT.µF M LT634-.25 V OT =.25V I OT ma N57 636 TA4 Lamp Outage Detector Over-The-Top Current Sense LAMP ON/OFF 5V TO 44V k 5k.5Ω M 3V OT OT = V FOR GOOD BLB 3V FOR OPEN BLB.V TO 44V R 2Ω LOAD R S.2Ω I LOAD 5V V I OT LOAD = (R S )(R2/R) R2 2k 636 TA8 V OT (V TO 4.3V) 636 TA7 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT46 Micropower Precision Series Reference Accuracy:.75% Max, Drift: ppm/ C Max, 2.5V, 5V, V Versions Available LT466/LT467 75µA Dual/Quad Rail-to-Rail Input and Output Op Amps 39µV V OS(MAX), Gain Bandwidth = 2kHz LT49/LT49 5µA Dual/Quad Rail-to-Rail Input and Output Op Amps 95µV V OS(MAX), Gain Bandwidth = 2kHz LT495/LT496.5µA Max, Dual/Quad Precision Rail-to-Rail Input and Output 375µV V OS(MAX),.5µA Supply Current Max Op Amps LT278/LT279 55µA Dual/Quad Precision Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 2kHz LT278/LT279 7µA Dual/Quad Precision Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 6kHz 2 Linear Technology Corporation 63 McCarthy Blvd., Milpitas, CA 9535-747 (48)432-9 FAX: (48) 434-57 www.linear-tech.com 636f LT/TP 98 4K PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 998