CIRCUIT060029

Single-supply, low-side, unidirectional current-sensing solution with output swing to GND circuit

CIRCUIT060029

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Overview

This single-supply, low-side, current sensing solution accurately detects load current between 0 A to 1 A and converts it to a voltage between 0 V to 4.9 V. The input current range and output voltage range can be scaled as necessary and larger supplies can be used to accommodate larger swings. A negative charge pump (such as the LM7705) is used as the negative supply in this design to maintain linearity for output signals near 0 V.
Features
  • Input: 0 A to 1 A
  • Output: 0 V to 4.9 V
  • Supply:
    • Vcc = 5 V
    • Vee = 0 V
    • Vref = 0 V

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Downloads

Design tool

Simulation for Unidirectional Current Sense with Output Swing to GND SBOC499.ZIP (376KB)

Supported products & hardware

Supported products & hardware

Precision op amps (Vos<1mV)
OPA320 Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier
General-purpose op amps
TLV9002 Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications

Technical documentation

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Type Title Date
* Circuit design Single-supply, low-side, unidirectional current-sensing solution (Rev. A) Feb. 01, 2019
Application note Low-Side Current Shunt Op-Amp Circuit to 3-V Single-Ended ADC for Cost-Optimized (Rev. A) Sep. 29, 2021
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) Dec. 11, 2015
Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide Dec. 08, 2014

Related design resources

Design tools & simulation

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Reference designs

REFERENCE DESIGN
TIPD129 0-1A, Single-Supply, Low-Side, Current Sensing Solution

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