LT1797

1

1797fc

For more information www.linear.com/LT1797

Typical applicaTion

FeaTures

DescripTion

10MHz, Rail-to-Rail

Input and Output

Op Amp in SOT-23

TheLT®1797isaunity-gainstable10MHzopampavailable

in the small SOT-23 package that operates on all single

and split supplies with a total voltage of 2.7V to 12V. The

amplifier draws 1mA of quiescent current and has a slew

rate of 2.25V/µs.

The input common mode range of the LT1797 includes

both rails, making it ideal for current sensing applications.

The input stage incorporates phase reversal protection

to prevent false outputs from occurring when the inputs

are driven beyond the supplies. Protective resistors are

includedintheinputleadssothatcurrentdoesnotbecome

excessive when the inputs are forced above or below the

supplies.

The output of the LT1797 can swing to within 50mV of V+

and 8mV of V– without drawing excess current in either

condition. The amplifier can drive loads up to 25mA and

still maintain rail-to-rail capability.

The LT1797 op amp is available in the space saving 5-lead

SOT-23 package.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT and Over-The-Top are trademarks of Analog Devices, Inc. All other trademarks are the

property of their respective owners.

Fast Compact –48V Current Sense

applicaTions

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Rail-to-Rail Input and Output

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Small SOT-23 Package

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Gain Bandwidth Product: 10MHz

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–40°C to 85°C Operation

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Slew Rate: 2.25V/µs

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Low Input Offset Voltage: 1.5mV Max

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High Output Current: 25mA Min

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Specified on 3V, 5V and ±5V Supplies

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High Voltage Gain: 1000V/mV 10k Load

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High CMRR: 96dB Typ

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High PSRR: 90dB Typ

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Input Bias Current: 300nA Max

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Input Offset Current: 25nA Max

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Low Profile (1mm) SOT-23 (ThinSOT™) Package

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Portable Instrumentation

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Rail-to-Rail Buffer Amplifiers

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Low Voltage Signal Processing

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Driving A/D Converters

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Battery-Powered Systems

Small-Signal Response

LT1797

0.1µF

R1 REDUCES Q1 DISSIPATION

Q1

FMMT493

0.003Ω

1% 3W

BZX84C6V8

VZ = 6.8V

–48V SUPPLY

(–42V TO –56V)

3.3k

0805

×3

30.1Ω

1%

ISENSE

+

–

R1

4.7k

VS = 3V

1k

1%

VOUT = 3V – 0.1Ω • ISENSE

ISENSE = 0A TO 30A

ACCURACY ≈ 3%

–48V LOAD

1797 TA01

SETTLES TO 1% IN 2µs,

1V OUTPUT STEP

VOUT

1797 TA01b

VS = ±2.5V

AV = 1

RL = 10k