Datasheet

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LT1637

1637fd

The LT

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 250µA of quiescent current. The LT1637

can be shut down, making the output high impedance and

reducing the quiescent current to only 3µA. The LT1637 is

reverse supply protected: it draws virtually no current for re-

verse supply up to 25V. The input range of the LT1637 in-

cludes 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 0.22µF and 150Ω 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 V

or 44V above V

, independent of V

The LT1637 op amp is available in the 8-pin MSOP, PDIP

and SO packages. For space limited applications, the

LT1637 is available in a 3mm × 3mm × 0.8mm dual fine

pitch leadless package (DFN).

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Battery or Solar Powered Systems:

Portable Instrumentation

Sensor Conditioning

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Supply Current Sensing

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Battery Monitoring

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MUX Amplifiers

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4mA to 25mA Transmitters

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Operates with Inputs Above V

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Rail-to-Rail Input and Output

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Micropower: 250µA Supply Current Max

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Operating Temperature Range: – 55°C to 125°C

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Gain-Bandwidth Product: 1.1MHz

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Slew Rate: 0.4V/µs

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Low Input Offset Voltage: 350µV Max

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Single Supply Input Range: –0.4V to 44V

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High Output Current: 25mA Min

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Specified on 3V, 5V and ±15V Supplies

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Output Shutdown

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Output Drives 4700pF with Output Compensation

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Reverse Battery Protection to 25V

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High Voltage Gain: 800V/mV

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High CMRR: 110dB

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Available in 8-Lead MSOP, PDIP and SO Packages;

and a Tiny (3mm × 3mm × 0.8mm) DFN Package

Over-The-Top

Current Source with Shutdown

SHDN

OUT

LT1004-1.24.7µF

*OPTIONAL FOR LOW OUTPUT CURRENTS,

R* = R

4V TO 44V

TP0610

1637 TA01

–

LT1637

OUT

e.g., 10mA = 120Ω

1.2

SHDN

10mA

5mA

0mA

OUT

100µs/DIV

Switchable Precision Current Source

Current Source Timing

APPLICATIO S

TYPICAL APPLICATIO

1.1MHz, 0.4V/µs

Over-The-Top Micropower, Rail-To-Rail

Input and Output Op Amp

FEATURES

DESCRIPTIO

1637 TA01b

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

Over-The-Top is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LT1637 1.1MHz, 0.4V/µs Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250µA Supply Current Max Operating Temperature Range: – 55°C to 125°C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/µs Low Input Offset Voltage: 350µV Max Single Supply Input Range: – 0.
PAGE 2
LT1637 U W W W ABSOLUTE AXI U RATI GS (Note 1) 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) .........
PAGE 3
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified.
PAGE 4
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –, VCM = VOUT = half supply unless otherwise specified.
PAGE 5
LT1637 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX SYMBOL PARAMETER CONDITIONS VOH Output Voltage Swing HIGH No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 14.9 14.2 13.7 14.967 14.667 14.
PAGE 6
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified.
PAGE 7
LT1637 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V –, unless otherwise specified. (Note 4) SYMBOL PARAMETER VOS Input Offset Voltage LT1637H/LT1637MP MIN TYP MAX CONDITIONS 100 ● UNITS 550 3.
PAGE 8
LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 300 TA = 125°C 200 TA = 25°C 150 TA = –55°C 100 50 0 40 300 30 200 100 0 TA = 125°C –100 TA = –55°C –200 –300 10 20 30 40 TOTAL SUPPLY VOLTAGE (V) 0.08 0.04 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5 4 1 Output Saturation Voltage vs Input Overdrive 10 OUTPUT SATURATION VOLTAGE (V) TA = 25°C TA = – 55°C 0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA) 100 100 VS = 5V, 0V VOD = 30mV 1 0.
PAGE 9
LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain and Phase Shift vs Frequency Gain-Bandwidth Product vs Temperature VS = ±2.5V 80 PHASE 40 60 30 40 GAIN 20 20 10 0 0 PHASE SHIFT (DEG) GAIN (dB) 50 100 –10 –20 1300 0.7 1200 0.6 1000 –30 1k 10k 100k FREQUENCY (Hz) VS = ±15V 1100 VS = ±1.
PAGE 10
LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling, Overshoot vs Capacitive Load Settling Time to 0.1% vs Output Step 100 VS = ±15V 8 90 80 AV = – 1 AV = 1 OVERSHOOT (%) OUTPUT STEP (V) 6 4 2 0 –2 –4 AV = 1 –6 10 VS = ±2.5V NO OUTPUT COMPENSATION AV = – 1 AV = 1 60 AV = 5 50 AV = 10 40 30 20 –8 VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k 1 AV = 2 70 THD + NOISE (%) 10 Total Harmonic Distortion + Noise vs Frequency 0.1 0.01 AV = –1 0.
PAGE 11
LT1637 U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01µF) 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 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.
PAGE 12
LT1637 U U W U APPLICATIO S I FOR ATIO 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. 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.
PAGE 13
LT1637 U TYPICAL APPLICATIO S Optional Output Compensation for Capacitive Loads Greater Than 200pF Positive Supply Rail Current Sense 5V + VIN 200Ω LT1637 CL ≤ 4700pF – 0.2Ω + LOAD Q1 2N3904 LT1637 200Ω – 0.22µF 0V TO 4.3V 150Ω 2k ILOAD 1637 TA03 1637 TA02 VOUT = (2Ω)(ILOAD) Lamp Outage Detector 3V 5V TO 44V 1M LAMP ON/OFF 100k 5k 0.
PAGE 14
LT1637 U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 ± 0.10 8 0.675 ±0.05 1.65 ± 0.10 (2 SIDES) 3.00 ±0.10 (4 SIDES) 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PIN 1 TOP MARK (NOTE 6) PACKAGE OUTLINE (DD) DFN 1203 0.75 ±0.05 0.200 REF 0.25 ± 0.05 4 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) 1 0.50 BSC 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1.
PAGE 15
LT1637 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC N8 1002 NOTE: 1.
PAGE 16
LT1637 U TYPICAL APPLICATIO S Sample-and-Hold 3V VIN 3V + + LT1637 – 0.22µF SHDN VSAMPLE LT1636 150Ω VOUT – 3V 1637 TA07 0V DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s MUX Amplifier MUX Amplifier Waveforms 5V VIN1 5kHz AT 4VP-P + VOUT LT1637 – VOUT 2V/DIV SHDN 5V – INPUT SELECT 5V/DIV LT1637 VIN2 10kHz AT 2VP–P + 0.