Automotive 76-V, Bi-Directional, High-Side, High-Speed, Voltage Output Current Sensing Amplifier - LMP8481-Q1

LMP8481-Q1 (ACTIVE)

Automotive 76-V, Bi-Directional, High-Side, High-Speed, Voltage Output Current Sensing Amplifier

 

Description

The automotive-qualified LMP8480-Q1 and LMP8481-Q1 devices are precision, high-side, current-sense amplifiers that amplify a small differential voltage developed across a current-sense resistor in the presence of high input common-mode voltages. These amplifiers are designed for bidirectional (LMP8481-Q1) or unidirectional (LMP8480-Q1) current applications and accept input signals with a common-mode voltage range from 4 V to 76 V with a bandwidth of 270 kHz. Because the operating power-supply range overlaps the input common-mode voltage range, the LMP848x-Q1 can be powered by the same voltage that is being monitored. This benefit eliminates the need for an intermediate supply voltage to be routed to the point of load where the current is being monitored, resulting in reduced component count and board space.

The LMP848x-Q1 family consists of fixed gains of 20, 60, and 100 for applications that demand high accuracy over temperature. The low-input offset voltage allows the use of smaller sense resistors without sacrificing system error. The LMP8480-Q1 and LMP8481-Q1 are pin-for-pin replacements for the MAX4080 and MAX4081 devices, offering improved offset voltage, wider reference adjust range, and higher output drive capabilities. The LMP8480-Q1 and LMP8481-Q1 are available in an 8-pin VSSOP package.

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Bidirectional or Unidirectional Sensing
  • Common Mode Voltage Range: 4.0 V to 76 V
  • Supply Voltage Range: 4.5 V to 76 V
  • Fixed Gains: 20, 60, and 100 V/V
  • Gain Accuracy: ±0.1%
  • Offset: ±80 µV
  • Bandwidth (–3 dB): 270 kHz
  • Quiescent Current: < 100 µA
  • Buffered High-Current Output: > 5 mA
  • Input Bias Current: 7 µA
  • PSRR (DC): 122 dB
  • CMRR (DC): 124 dB

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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)
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)
LMP8481-Q1 LMP8480-Q1
76    76   
4    4   
265    265   
6    6   
20
60
100   
20
60   
0.8    0.8   
100    100   
270    270   
76    7.6   
4.5    4.5   
0.155    0.155   
Bi-directional    N/A   
Automotive    Automotive   
-40 to 125    -40 to 125   
VSSOP    VSSOP   
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)    8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
60    60   
0.8    0.8   
48    48   
48    48   

Other qualified versions of LMP8481-Q1

Version Part Number Definition
Catalog LMP8481 TI's standard catalog product

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LMP8481-Q1 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
4.5 ≤ 
V ≤ 76
4 ≤ 
V ≤ 76
-40 ≤ 
C ≤ 125