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1 Features

1? Typical Values, TA = 25°C

? High Common-Mode Voltage Range

– LMP8640: -2 V to 42 V

– LMP8640-Q1: -2 V to 42 V, AEC-Q100

– LMP8640HV: -2 V to 76 V

? Supply Voltage Range: 2.7 V to 12 V

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

? Max Gain Error: 0.25%

? Low Offset Voltage: 900 μV

? Input Bias Current: 13 μA

? PSRR: 85 dB

? CMRR (2.1V to 42V): 103 dB

? Temperature Range: -40°C to 125°C

? 6-Pin Thin SOT-23 Package

2 Applications

? High-Side Current Sense

? Vehicle Current Measurement

? Motor Controls

? Battery Monitoring

? Remote Sensing

? Power Management

3 Description

The LMP8640, LMP8640-Q1 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 2.7 V to 12 V.

The LMP8640 and LMP8640-Q1 accept input signals

with common mode voltage range from -2 V to 42 V,

while the LMP8640HV accepts input signal with common mode voltage range from -2 V to 76 V. 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 20 V/V, 50 V/V, 100 V/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 and

consumer applications, while the LMP8640-Q1 is an AEC-Q100 grade 1 qualified version of the LMP8640

for automotive applications. The LMP8640-x is

available in SOT-23-6 package.