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
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Technical documentation

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Type Title Date
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) PDF | HTML Sep 24, 2024
Application note Voltage-to-current (V-I) converter circuit with MOSFET (Rev. A) PDF | HTML Aug 20, 2021
Circuit design Voltage-to-current (V-I) converter circuit with BJT PDF | HTML May 14, 2021
Application note AN-31 Amplifier Circuit Collection (Rev. D) PDF | HTML Oct 21, 2020
User guide TIPD102 Verified Design Reference Guide Sep 19, 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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