42-V, Low- or High-Side, High-Speed, Voltage Output Current Sensing Amplifier - LMP8640

LMP8640 (ACTIVE)

42-V, Low- or High-Side, High-Speed, Voltage Output Current Sensing Amplifier

 

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.

Features

  • 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

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Parametrics Compare all products in Current Sense Amplifiers Analog Output

 
Common Mode Voltage (Max) (V)
Common Mode Voltage (Min) (V)
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/C)
Gain (V/V)
Gain Error (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Special Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Gain Error Drift (Max) (ppm/°C)
PSRR (Typ) (uV/V)
Specified Common Mode Voltage (V)
Specified Power Supply Voltage (V)
LMP8640 LMP8645
42    42   
-2    -2   
900    1000   
1.2    4   
20
50
100   
Adjustable   
0.25    2   
60    60   
950
450
230   
990   
12    12   
2.7    2.7   
0.722    0.61   
Low-side Capable    Low-side Capable   
Catalog    Catalog   
-40 to 125    -40 to 125   
SOT-23-THIN    SOT-23-THIN   
6SOT-23-THIN: 8 mm2: 2.8 x 2.9(SOT-23-THIN)    6SOT-23-THIN: 8 mm2: 2.8 x 2.9(SOT-23-THIN)   
26.2    140   
56    56   
1.65    2.1   
3.3    12   

Other qualified versions of LMP8640

Version Part Number Definition
Automotive LMP8640-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

LMP8640 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
2.7 ≤ 
V ≤ 12
-2 ≤ 
V ≤ 42
-40 ≤ 
C ≤ 125