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CIRCUIT060001

Single-supply, low-side, unidirectional current-sensing circuit

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CIRCUIT060001

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Overview

This single–supply, low–side, current sensing solution accurately detects load current up to 1A and converts it to a voltage between 50mV and 4.9V. The input current range and output voltage range can be scaled as necessary and larger supplies can be used to accommodate larger swings.
Features
  • Senses Temperature between 25°C - 50°C 
  • Output: 0.05V - 3.25V 
  • Single 3.3V Supply with half-supply reference

Get started

  1. Read the circuit design and circuit design with MSP430 SAC
  2. Download the model

Downloads

Design tool

Simulation for Single-Supply Low-Side Unidirectional Current-Sense Circuit — SBOC523.ZIP (13KB)

Supported products & hardware
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Supported products & hardware

General-purpose op amps
OPA375 — OPAx375, 500uV, 10-MHz, Low Broadband Noise, RRO, Operational Amplifier TLV9061 — Single, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications
MSP430 microcontrollers
MSP430FR2310 — 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 — 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 — 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
LPV821 — 650nA, Precision Zero-Drift Nanopower Amplifier

Technical documentation

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Type Title Date
* Circuit design Single-supply low-side unidirectional current-sensing circuit with MSP430 SAC (Rev. A) PDF | HTML 06 Mar 2020
* Circuit design Single-supply, low-side, unidirectional current-sensing circuit 30 Dec 2018
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML 02 Dec 2020
E-book Simplifying Current Sensing (Rev. A) 09 Jan 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Application note Precision, Low-Side Current Measurement (Rev. B) 06 Mar 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) 18 Feb 2019
Application note Low-Side Current Sense Circuit Integration 30 Mar 2017
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) 11 Dec 2015
Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide 08 Dec 2014
User guide TIPD104 Design Reference Guide 19 Sep 2013

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