LMP8640

LMP8640HV

www.ti.com

SNOSB28D – AUGUST 2010 – REVISED NOVEMBER 2011

Precision High Voltage Current Sense Amplifier

Check for Samples: LMP8640, LMP8640HV

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FEATURES

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Temperature Range: -40°C to 125°C

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High Common-Mode Voltage Range

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6-Pin SOT Package

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LMP8640: -2V to 42V

APPLICATIONS

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LMP8640HV: -2V to 76V

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High-Side Current Sense

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Supply Voltage Range: 2.7V to 12V

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Vehicle Current Measurement

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Gain Options: 20V/V; 50V/V; 100V/V

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Motor Controls

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Max Gain Error: 0.25%

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Battery Monitoring

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Low Offset Voltage: 900µV

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Remote Sensing

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Input Bias Current: 13 µA

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Power Management

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PSRR: 85 dB

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CMRR (2.1V to 42V): 103 dB

DESCRIPTION

The LMP8640 and the LMP8640HV are precision current sense amplifiers that detect small differential voltages

across a sense resistor in the presence of high input common mode voltages with a supply voltage range from

2.7V to 12V.

The LMP8640 accepts input signals with common mode voltage range from -2V to 42V, while the LMP8640HV

accepts input signal with common mode voltage range from -2V to 76V. The LMP8640 and LMP8640HV have

fixed gain for applications that demand accuracy over temperature. The LMP8640 and LMP8640HV come out

with three different fixed gains 20V/V, 50V/V, 100V/V ensuring a gain accuracy as low as 0.25%. The output is

buffered in order to provide low output impedance. This high side current sense amplifier is ideal for sensing and

monitoring currents in DC or battery powered systems, excellent AC and DC specifications over temperature,

and keeps errors in the current sense loop to a minimum. The LMP8640 and LMP8640HV are ideal choice for

industrial, automotive and consumer applications, and it is available in SOT-6 package.

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.