LMP8645:42-V, Configurable Gain, Low- or High-Side, High-Speed, Voltage Output Current Sensing Amplifier

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

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

  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • 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
Common Mode Voltage (Max) (V)4242
Common Mode Voltage (Min) (V)-2-2
Input Offset (+/-) (Max) (uV)1000900
Input Offset Drift (+/-) (Typ) (uV/C)41.2
Gain (V/V)Adjustable20 50 100
Gain Error (%)20.25
CMRR (Min) (dB)6060
Bandwidth (kHz)990950 450 230
Supply Voltage (Max) (V)1212
Supply Voltage (Min) (V)2.72.7
Iq (Max) (mA)0.610.722
Special FeaturesLow-side CapableLow-side Capable
Operating Temperature Range (C)-40 to 125-40 to 125
Package GroupSOTSOT
Package Size: mm2:W x L (PKG)6SOT: 8 mm2: 2.8 x 2.9(SOT)6SOT: 8 mm2: 2.8 x 2.9(SOT)
Approx. Price (US$)0.85 | 1ku0.85 | 1ku
Gain Error Drift (Max) (ppm/°C)14026.2
PSRR (Typ) (uV/V)5656
Specified Common Mode Voltage (V)2.11.65
Specified Power Supply Voltage (V)123.3
Models (1)
TitleTypeSize (KB)Date
Design kits & evaluation modules (1)
Evaluation Board for the LMP8645LMP8645MKEVALEvaluation Modules & Boards
Development tools (1)
SPICE-Based Analog Simulation ProgramTINA-TICircuit Design & Simulation
Ordering Information
Part #Preproduction / Production MaterialStatusTemp(oC)Price | QTYPackage | PinsDevice MarkingPackage QTY | Carrier
LMP8645MK/NOPBProductionACTIVE-40 to 1250.85 | 1kuSOT (DDC)AJ6A1000 | LARGE T&R
LMP8645MKE/NOPBProductionACTIVE-40 to 1250.98 | 1kuSOT (DDC)AJ6A250 | SMALL T&R
LMP8645MKX/NOPBProductionACTIVE-40 to 1250.85 | 1kuSOT (DDC)AJ6A3000 | LARGE T&R
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模拟信号链路产品指南 (Rev. B) BQ24392
Power Management Guide 2016 BQ2005
Industrial Motor Drive Solution Guide LMZ34002
LMP8645 PSPICE Model LMP8645