CIRCUIT060001

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

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

Downloads

Design tool

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

Release date: 05-Jul-2018
Supported products & hardware

Supported products & hardware

General-purpose op amps
OPA375 OPAx375, 500uV, 10-MHz, Low Broadband Noise, RRO, Operational Amplifier TLV9061 Industry's smallest 10MHz, RRIO, 1.8V-5.5V operational amplifier
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 AD 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
* Application note Single-supply low-side unidirectional current-sensing circuit with MSP430 SAC (Rev. A) Mar. 06, 2020
* Application note Single-supply, low-side, unidirectional current-sensing circuit Dec. 30, 2018
Application note Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) Dec. 02, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) Oct. 24, 2019
Application note Precision, Low-Side Current Measurement (Rev. B) Mar. 06, 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Application note Low-Side Current Sense Circuit Integration Mar. 30, 2017
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) Dec. 11, 2015
User guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide Dec. 08, 2014
User guide TIPD104 Design Reference Guide Sep. 19, 2013

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