LMP8640 42V, Low/High-Side, High-Speed, Voltage Output Current Sensing Amplifier | TI.com

LMP8640 (ACTIVE)

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

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

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

View more

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 (%)
Gain Error Drift (Max) (ppm/°C)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Number of Channels (#)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
LMP8640 LMP8645
42     42    
-2     -2    
900     1000    
1.2     4    
100
20
50    
Adjustable    
0.25     2    
26.2     140    
60     60    
950
450
230    
990    
12     12    
2.7     2.7    
0.722     0.61    
1     1    
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)    

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