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FEATURES
s s s s s s s s s s s s s s
LT1637 1.1MHz, 0.4V/s Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO
The LT(R)1637 is a rugged op amp that operates on all single and split supplies with a total voltage of 2.7V to 44V. The LT1637 has a gain-bandwidth product of 1.1MHz while drawing less than 250A of quiescent current. The LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3A. The LT1637 is reverse supply protected: it draws virtually no current for reverse supply up to 25V. The input range of the LT1637 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1637 can drive heavy loads; its rail-to-rail output drives 25mA. The LT1637 is unity-gain stable into all capacitive loads up to 4700pF when optional 0.22F and 150 compensation is used. The LT1637 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. 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 VEE or 44V above VEE, independent of VCC. The LT1637 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.
Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250A Supply Current Max Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/s Low Input Offset Voltage: 350V Max Single Supply Input Range: - 0.4V to 44V High Output Current: 25mA Min Specified on 3V, 5V and 15V Supplies Output Shutdown Output Drives 4700pF with Output Compensation Reverse Battery Protection to 25V High Voltage Gain: 800V/mV High CMRR: 110dB
APPLICATIO S
s
s s s s
Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters
TYPICAL APPLICATIO
+
4.7F R* LT1004-1.2 2k
Over-The-TopTM Current Source with Shutdown Switchable Precision Current Source
4V TO 44V
6V 4V VSHDN 2V
R
+
LT1637 TP0610 IOUT = 1.2 R e.g., 10mA = 120
1637 TA01
0V
-
IOUT SHDN
10mA IOUT 5mA 0mA
*OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R
U
U
U
Current Source Timing
100s/DIV
1637 TA01b
1
LT1637
ABSOLUTE
(Note 1)
AXI U RATI GS
Operating Temperature Range (Note 3) .. - 40C to 85C Specified Temperature Range (Note 4) ... - 40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Total Supply Voltage (V + to V -) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... 25mA Shutdown Pin Voltage Above V - ..................................... 32V Shutdown Pin Current ........................................ 10mA Output Short-Circuit Duration (Note 2) ......... Continuous
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL - IN + IN V- 1 2 3 4 8 7 6 5 NULL V+ OUT SHDN
ORDER PART NUMBER LT1637CMS8
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 250C/W
MS8 PART MARKING LTIE
Consult factory for Military grade parts.
3V A D 5V ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V -,VCM = VOUT = Half Supply unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS N8, S8 Packages 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current VCM = 44V (Note 5) Input Bias Current VCM = 44V (Note 5) VS = 0V Input Noise Voltage en in Input Noise Voltage Density Input Noise Current Density 0.1Hz to 10Hz f = 1kHz f = 1kHz N8, S8 Packages, - 40C TA 85C MS8 Package, - 40C TA 85C
q q
2
U
U
W
WW U
W
TOP VIEW NULL 1
- IN + IN
8 7 6 5
NULL V+ OUT SHDN
ORDER PART NUMBER LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 S8 PART MARKING 1637 1637I
2 3
V- 4 N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/W (N8) TJMAX = 150C, JA = 190C/W (S8)
U
MIN
TYP 100
MAX 350 550 700 350 750 900 3 6 6.0 2.5 50 60
UNITS V V V V V V V/C V/C nA A nA A nA VP-P nV/Hz pA/Hz
100
q q q q q q q q
1 2 0.4 20 23 0.1 0.6 27 0.08
LT1637
3V A D 5V ELECTRICAL CHARACTERISTICS
SYMBOL RIN CIN CMRR AVOL PARAMETER Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 5) Large-Signal Voltage Gain VCM = 0V to (VCC - 1V) VCM = 0V to 44V (Note 8) CONDITIONS Differential Common Mode, VCM = 0V to 44V
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V -, VCM = VOUT = Half Supply unless otherwise specified. (Note 4)
MIN 1 0.7
q q q q q q q q q q q q q q
VOL
VOH
ISC
PSRR
IS
ISHDN
tON tOFF tSETTLING GBW
SR
U
TYP 2.6 1.4 4
MAX
UNITS M M pF
0 88 80 150 100 75 300 200 150 110 98 400
44
V dB dB V/mV V/mV V/mV V/mV V/mV V/mV
VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0C TA 70C VS = 3V, - 40C TA 85C VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0C TA 70C VS = 5V, - 40C TA 85C
800
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA
3 325 580 2.94 2.25 4.94 3.80 10 15 15 15 2.975 2.67 4.975 4.45 14 45 22 60 98
8 700 1300
mV mV mV V V V V mA mA mA mA dB
Output Voltage Swing HIGH
Short-Circuit Current (Note 2)
VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC
Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage Supply Current (Note 6) Supply Current, SHDN Shutdown Pin Current
VS = 3V to 12.5V, VCM = VO = 1V IS = - 100A
q q q q
90 25
2.7 40 190 250 295 12 15 5
V V A A A nA A A A A A s s s kHz kHz kHz V/s V/s V/s
VPIN5 = 2V, No Load (Note 6) VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V VPIN5 = 2V, No Load (Note 6) VPIN5 = 32V, No Load (Note 5) VPIN5 = 5V to 0V, RL = 10k VPIN5 = 0V to 5V, RL = 10k 0.1% AV = 1, VO = 2V f = 10kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = 0C TA 70C - 40C TA 85C
q q q
3 0.2 1.0 2.5 4.3 0.02 20 45 3 9 650 550 500 0.210 0.185 0.170 1000
Output Leakage Current Maximum Shutdown Pin Current Turn-On Time Turn-Off Time Settling Time Gain-Bandwidth Product (Note 5) Slew Rate (Note 7)
q q
1 150
q q q q
0.35
3
LT1637
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS N8, S8 Packages 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) IOS IB en in RIN CIN CMRR AVOL Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = - 15V to 29V VO = 14V, RL = 10k 0C TA 70C - 40C TA 85C No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA Short Output to GND 0C TA 70C - 40C TA 85C VS = 1.5V to 22V
q q q q q q q q q q q q q q q q
15V ELECTRICAL CHARACTERISTICS
MIN
TYP 100
MAX 450 650 800 450 800 950 3 6 6 50
UNITS V V V V V V V/C V/C nA nA VP-P nV/Hz pA/Hz M M pF
100
q q q q q q
N8, S8 Packages, - 40C TA 85C MS8 Package, - 40C TA 85C
1 2 1 17 0.6 27 0.08 1 3 2200 4 - 15 80 100 75 50 110 400
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = - 15V to 14V
29
V dB V/mV V/mV V/mV
VOL
Output Voltage Swing LOW
- 14.997 - 14.680 - 14.420 14.9 14.2 13.7 25 20 15 90 14.967 14.667 14.440 31.7
- 14.95 - 14.25 - 13.65
V V V V V V mA mA mA dB
VOH
Output Voltage Swing HIGH
ISC
Short-Circuit Current (Note 2)
PSRR IS
Power Supply Rejection Ratio Minimum Supply Voltage Supply Current
115 1.35 230 300 370 40 15 8 150 2 -20.0
V A A A nA A A A V V s s
q
Positive Supply Current, SHDN ISHDN Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current VL VH tON tOFF Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time
VPIN5 = - 20V, VS = 22V, No Load VPIN5 = - 21.7V, VS = 22V, No Load VPIN5 = - 20V, VS = 22V, No Load VPIN5 = 32V, VS = 22V VPIN5 = - 20V, VS = 22V, No Load VS = 22V VS = 22V VPIN5 = - 10V to - 15V, RL = 10k VPIN5 = - 15V to - 10V, RL = 10k
q q q q q q q
6 0.3 0.9 20 0.02 - 21.7 - 21.6 - 20.8 35 3
4
LT1637
15V ELECTRICAL CHARACTERISTICS
SYMBOL GBW PARAMETER Gain-Bandwidth Product CONDITIONS f = 10kHz 0C TA 70C - 40C TA 85C
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - unless otherwise specified. (Note 4)
MIN
q q q q
TYP 1100
MAX
UNITS kHz kHz kHz V/s V/s V/s
750 650 600 0.225 0.200 0.180
SR
Slew Rate
AV = - 1, RL = , VO = 10V, Measure at VO = 5V 0C TA 70C - 40C TA 85C
0.4
Note 1: 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 LT1637 is guaranteed functional over the operating temperature range of - 40C to 85C. Note 4: The LT1637C is guaranteed to meet specified performance from 0C to 70C. The LT1637C is designed, characterized and expected to meet specified performance from - 40C to 85C but is not tested or QA sampled at these temperatures. The LT1637I is guaranteed to meet specified performance from - 40C to 85C.
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V or VS = 22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V or VS = 22V tests. Note 7: Guaranteed by correlation to slew rate at VS = 15V and GBW at VS = 3V and VS = 15V tests. Note 8: This specification implies a typical input offset voltage of 650V at VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V. Note 9: This parameter is not 100% tested.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
400
CHANGE IN INPUT OFFSET VOLTAGE (V)
350
SUPPLY CURRENT (A)
300 250 200 150 100 50 0 0 10 20 30 40 TOTAL SUPPLY VOLTAGE (V)
1637 G01
200 100 0 -100 -200 -300 -400 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5
1637 G02
INPUT BIAS CURRENT (A)
TA = 125C TA = 25C TA = -55C
UW
Minimum Supply Voltage
400 300
40 30 20 10 0.12 0.08 0.04 0 0.04 0.08
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V
TA = -55C
TA = 125C TA = -55C TA = 25C
TA = 125C TA = 25C
4
4.2 4.4 4.6 4.8 5 10 20 30 40 50 COMMON MODE VOLTAGE (V)
1637 G03
5
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage vs Load Current (Output High)
1 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) VS = 5V, 0V VOD = 30mV 10
OUTPUT SATURATION VOLTAGE (mV)
0.1
TA = 125C TA = 25C TA = - 55C
0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA)
0.1Hz to 10Hz Noise Voltage
70
VS = 2.5V
VS = 15V 60
INPUT NOISE CURRENT DENSITY (pA/Hz)
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
NOISE VOLTAGE (200nV/DIV)
0
1
2
3
456 TIME (s)
7
Open-Loop Gain and Phase Shift vs Frequency
70 60 50 40 VS = 2.5V PHASE 120
GAIN-BANDWIDTH PRODUCT (kHz)
1100 1000 900 800 700 - 50 -25
SLEW RATE (V/s)
GAIN (dB)
30 20 10 0 -10 -20 -30 1k 10k 100k FREQUENCY (Hz) 1M
1637 G10
GAIN
6
UW
100
1637 G04
Output Saturation Voltage vs Load Current (Output Low)
100 VS = 5V, 0V VOD = 30mV 1 90 80 70 60 50 40 30 20 10 0
Output Saturation Voltage vs Input Overdrive
VS = 5V, 0V NO LOAD
0.1 TA = 125C 0.01 TA = 25C TA = - 55C 100
1637 G05
OUTPUT HIGH
0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA)
OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
1637 G06
Noise Voltage Density vs Frequency
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0
Input Noise Current vs Frequency
VS = 15V
50
40
30
20
8 9 10
1
10 100 FREQUENCY (Hz)
1000
1637 G08
1
10 100 FREQUENCY (Hz)
1000
1637 G09
1637 G07
Gain-Bandwidth Product vs Temperature
1300 1200 VS = 15V 0.7 0.6 0.5 0.4 0.3 0.2 100 80 60 40 20 0
Slew Rate vs Temperature
RISING, VS = 15V
PHASE SHIFT (DEG)
RISING, VS = 1.5V FALLING, VS = 15V FALLING, VS = 1.5V
VS = 1.5V
50 25 75 0 TEMPERATURE (C)
100
125
0.1 - 50
- 25
0
50 75 25 TEMPERATURE (C)
100
125
1637 G11
1637 G12
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Gain-Bandwidth Product and Phase Margin vs Supply Voltage
1300 55 COMMON MODE REJECTION RATIO (dB) 50 PHASE MARGIN 1200 1150 GAIN BANDWIDTH 1100 1050 1000 35 30 25 45 40
90 80 70 60 50 40 30 20 10 0 1k 10k 100k FREQUENCY (Hz) 1M
1637 G14
POWER SUPPLY REJECTION RATIO (dB)
GAIN-BANDWIDTH PRODUCT (kHz)
1250
0
5
10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V)
Gain-Bandwidth Product and Phase Margin vs Load Resistance
1400
GAIN-BANDWIDTH PRODUCT (kHz)
1300 1200 1100 1000
VS = 2.5V PHASE MARGIN
OUTPUT SWING (VP-P)
40 35 30 GAIN BANDWIDTH 25 20 15 1k 10k LOAD RESISTANCE () 10 100k
1637 G16
OUTPUT IMPEDANCE ()
900 800 700 600
Settling Time to 0.1% vs Output Step
10 8 6
OUTPUT STEP (V)
VS = 15V
OVERSHOOT (%)
2 0 -2 -4 -6 -8 -10 0 10 30 20 SETTLING TIME (s) 40
1637 G19
60 50 40 30 20 10 0 10
AV = 1
AV = 5
THD + NOISE (%)
4
AV = 1
AV = - 1
AV = 1
AV = - 1
UW
45
1637 G13
CMRR vs Frequency
100 90 80 70 60 50 40 30 20 10 0 -10
PSRR vs Frequency
VS = 2.5V
VS = 15V VS = 1.5V
PHASE MARGIN (DEG)
PHASE MARGIN (DEG)
POSITIVE SUPPLY
NEGATIVE SUPPLY
1k
10k 100k FREQUENCY (Hz)
1M
1637 G15
Output Impedance vs Frequency
50 45 1k
25 20 15 10 5
Undistorted Output Swing vs Frequency
35 30 Vs = 15V DISTORTION 1% AV = 1
10k VS = 2.5V
100
AV = 100
10
AV = 10
1
AV = 1
Vs = 2.5V
0.1 100
1k
10k 100k FREQUENCY (Hz)
1M
1637 G17
0 100
1k 10k FREQUENCY (Hz)
100k
1637 G18
Capacitive Load Handling, Overshoot vs Capacitive Load
100 90 80 70 VS = 2.5V NO OUTPUT COMPENSATION AV = 2
Total Harmonic Distortion + Noise vs Frequency
10 VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k
1
0.1
AV = 10
0.01 AV = -1 AV = 1
0.001
0.0001
100 1000 CAPACITIVE LOAD (pF) 10000
1637 G20
10
100
1k 10k FREQUENCY (Hz)
100k
1637 G21
7
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Total Harmonic Distortion + Noise vs Load Resistance
1 VS = 1.5V VIN = 0.9V
0.1
THD + NOISE (%)
0.01
VS = 3V, 0V VIN = 0.6V TO 2.4V
THD + NOISE (%)
0.001 VS = 3V, 0V VIN = 0.3V TO 2.1V 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND () 100k
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE (50V/DIV) VS = 15V A B C A: RL = 2k B: RL = 10k C: RL = 50k -10V 0V 10V OUTPUT VOLTAGE (5V/DIV)
1637 G24
A B C
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01F) within an inch of the pin. When driving heavy loads an additional 4.7F electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1637 is protected against reverse battery voltages up to 25V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. When operating the LT1637 on total supplies of 30V or more, the supply must not be brought up faster than 1s. 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. 5 of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time.
8
U
W
UW
Total Harmonic Distortion + Noise vs Output Voltage
10 RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = -1, RG = 100k AV = 1 VS = 3V, 0V
VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz
1
AV = -1 VS = 1.5V AV = 1 VS = 1.5V AV = 1 VS = 3V, 0V
0.1
0.01
0.001 0
AV = -1, VS = 3V, 0V 1 2 OUTPUT VOLTAGE (VP-P) 3
1637 G23
1637 G22
Large-Signal Response
VS = 15V AV = - 1 10V 50mV
Small-Signal Response
VS = 15V AV = 1
- 50mV - 10V
1637 G25
1637 G26
U
U
Inputs The LT1637 has two input stages, NPN and PNP (see the 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 0.9V or more below V +, the PNP input stage is active and the input bias current is typically - 20nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 80nA. 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 600V.
LT1637
APPLICATIO S I FOR ATIO
A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1637 to operate with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 23A at room temperature. The input offset voltage is typically 600V when operating above V +. The LT1637 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 1.3k 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 LT1637 is affected by input overdrive as shown in the typical performance curves. When monitoring input voltages within 100mV of V +, gain should be taken to keep the output from clipping. The output of the LT1637 can be pulled up to 25V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. 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 100mA, no damage will occur. The LT1637 is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22F capacitor in series with a 150 resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 4700pF, 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 LT1637 switches between input stages there is significant nonlinearity in the CMRR.
LT1637 8 1 10k
U
Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1637 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + - 0.9V). 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 LT1637 can be shut down two ways: using the shutdown pin or bringing V + to within 0.5V of V -. When V + is brought to within 0.5V of V - both the supply current and output leakage current drop to less than 10nA. When the shutdown pin is brought 1.2V above V -, the supply current drops to about 3A and the output leakage current is less than 1A, independent of V +. In either case the input bias current is less than 0.1nA (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 10mA. Input Offset Nulling The input offset voltage can be nulled by placing a 10k potentiometer between Pins 1 and 8 with its wiper to V - (see Figure 1). The null range will be at least 3mV.
V-
1637 F01
W
U
U
Figure 1. Input Offset Nulling
9
LT1637
SI PLIFIED SCHE ATIC
7 V+ Q1 D1 R2 6k SHDN 5 R1 1M Q3 Q4 R5 7k Q5 Q6 Q7 Q8 D4 D5 NULL 1 R7 400 R8 400 4 V-
1637 SS
10A
Q2 + IN 3
TYPICAL APPLICATIO S
Positive Supply Rail Current Sense
V+ 200 5V 0.2 200 LOAD ILOAD VOUT = (2)(ILOAD)
+
LT1637 Q1 2N3904 0V TO 4.3V 2k
1637 TA02
-
Over-The-Top Comparator with Hysteresis
1M 3V TO 44V IN1 (0V TO 44V) 10k
+
LT1637 VOUT 1M
-
2N5087 IN2 (0V TO 44V) 10k 1M
V HYSTERESIS = CC 100
2N5210
1637 TA04
10
U
W
- IN
W
Q13 D2
Q19 Q25 Q23 D3 Q21 Q24 6 OUT
R3 1.3k 2 R4 1.3k Q9 Q10 Q14 Q15
Q18
Q20
Q22
Q11
Q12
Q16
Q17
Q26
R6 7k 8 NULL
Optional Output Compensation for Capacitive Loads Greater Than 200pF
Lamp Outage Detector
5V TO 44V 1M 3V
VIN
+
LT1637
LAMP ON/OFF
-
0.22F 150
1637 TA03
CL 4700pF
100k 5k 0.5
-
LT1637 OUT
+
OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB
1637 TA05
Over-The-Top Current Sense
0.1V TO 44V R1 200 5V RS 0.2
+
LT1637
-
1M
ILOAD LOAD ILOAD = VOUT (RS)(R2/R1)
Q1 2N3904 VOUT (0V TO 4.3V) R2 2k
1637 TA06
LT1637
PACKAGE DESCRIPTIO
0.007 (0.18) 0.021 0.006 (0.53 0.015)
0 - 6 TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) BSC 0.193 0.006 (4.90 0.15) 0.118 0.004** (3.00 0.102)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076)
(
+0.035 0.325 -0.015 +0.889 8.255 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.053 - 0.069 (1.346 - 1.752)
0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016 - 0.050 (0.406 - 1.270)
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.
U
Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102)
0.040 0.006 (1.02 0.15)
0.034 0.004 (0.86 0.102)
8
76
5
0.006 0.004 (0.15 0.102)
MSOP (MS8) 1098
1
23
4
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.045 - 0.065 (1.143 - 1.651)
0.130 0.005 (3.302 0.127)
0.255 0.015* (6.477 0.381)
1
2
3
4
0.100 (2.54) BSC
N8 1098
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5
0.050 (1.270) BSC
1
2
3
4
SO8 1298
11
LT1637
TYPICAL APPLICATIO S
Sample-and-Hold
3V VIN 3V LT1637
VSAMPLE
3V 0V
DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
MUX Amplifier
5V VIN1 5kHz AT 4VP-P
+
LT1637 VOUT
VOUT 2V/DIV
-
SHDN
-
LT1637 VIN2 10kHz AT 2VP-P
+
SHDN
0.2ms/DIV
1637 TA08
INPUT SELECT 1kHz AT 5VP-P 74HC04
1637 TA09
RELATED PARTS
PART NUMBER
LT1078/LT1079 LT2078/LT2079 LT1178/LT1179 LT2178/LT2179 LT1366/LT1367 LT1490/LT1491 LT1636 LT1638/LT1639 LT1782 LT1783
DESCRIPTION
Dual/Quad 55A Max, Single Supply, Precision Op Amps Dual/Quad 17A Max, Single Supply, Precison Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
+ +
150 0.22F
-
SHDN
LT1636
VOUT
-
1637 TA07
MUX Amplifier Waveforms
5V
INPUT SELECT 5V/DIV
COMMENTS
Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 2.5V/C Drift (Max), 200kHz GBW, 0.07V/s Slew Rate Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 4V/C Drift (Max), 85kHz GBW, 0.04V/s Slew Rate 475V VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW Single Supply Input Range: - 0.4V to 44V, Micropower 50A per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW 55A Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function 0.4V/s Slew Rate, 230A Supply Current per Amplifier SOT-23, 800V VOS(MAX), IS =55A (Max), Gain-Bandwidth = 200kHz, Shutdown Pin SOT-23, 800V VOS(MAX), IS =300A (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin
1637f LT/TP 0100 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1999

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