The LMP8645 and the LMP8645HV devices are precision currentsense amplifiers that detect small differential voltages across a sense resistor in the presence ofhigh-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with acommon-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with acommon-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain forapplications where supply current and high common-mode voltage are the determining factors. Thegain is configured with a single resistor, providing a high level of flexibility, as well asaccuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered toprovide low output impedance. This high-side current sense amplifier is ideal for sensing andmonitoring currents in DC or battery-powered systems, has excellent AC and DC specifications overtemperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an idealchoice for industrial, automotive, and consumer applications, and is available in SOT-6package.

• Typical Values, T_A = 25°C
• High Common-Mode Voltage Range
  • LMP8645 –2 V to 42 V
  • LMP8645HV –2 V to 76 V
• Supply Voltage Range 2.7 V to 12 V
• Gain Configurable With a Single Resistor
• Maximum Variable Gain Accuracy (With
  External Resistor) 2%
• Transconductance 200 µA/V
• Low Offset Voltage 1 mV
• Input Bias 12 µA
• PSRR 90 dB
• CMRR 95 dB
• Temperature Range –40°C to 125°C
• 6-Pin SOT Package