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CIRCUIT060014

Voltage-to-current (V-I) converter circuit with MOSFET

CIRCUIT060014

Overview

This single-supply, low-side, V-I converter delivers a well-regulated current to a load which can be connected to a voltage greater than the op amp supply voltage. The circuit accepts an input voltage between 0 V and 2 V and converts it to a current between 0 mA and 100 mA. The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor, R3, to the inverting input of the op amp.
Features
  • Single 5-V supply
  • Input: 0 V to 2 V
  • Output: 0 mA to 100 mA
General-purpose op amps
TLV9042 — Dual, 5.5-V, 350-kHz, Ultra-low 1.2-V, low quiescent current (10-μA) op amp TLV9062 — Dual, 5.5-V, 10-MHz operational amplifier
4-20mA signal conditioners
XTR111 — Voltage-to-current converter/transmitter with 3-V to 15-V regulator and resistor set I/O ratio
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Technical documentation

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Type Title Date
* Application note Voltage-to-current (V-I) converter circuit with MOSFET (Rev. A) PDF | HTML 20 Aug 2021
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) 18 Dec 2023
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
Circuit design Voltage-to-current (V-I) converter circuit with BJT PDF | HTML 14 May 2021
Application note AN-31 Amplifier Circuit Collection (Rev. D) 21 Oct 2020
User guide TIPD102 Verified Design Reference Guide 19 Sep 2013

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Reference designs

REFERENCE DESIGN
TIPD101 — Low side V-I converter reference design, 0-V to 5-V input, 0-mA to 500-mA output TIPD102 — High side V-I converter reference design from 0 V to 2 V and 0 mA to 100 mA, 1% full-scale error

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