Simple Current Limiter Is Programmable

Abstract: This circuit lets you program a current limit without using microcontrollers or data converters. It consists of a charge-pump voltage doubler (U1), a current-sense amplifier (U2), and two n-channel MOSFETs. The sense-resistor value determines the maximum current limit.
Maxim > App Notes > Amplifier and Comparator Circuits Power-Supply Circuits
Keywords: charge-pump voltage doublers, current-sense amplifiers, n-channel MOSFETs, inrush current Nov 05, 2010

APPLICATION NOTE 4501
Simple Current Limiter Is Programmable


Abstract:This circuit lets you program a current limit without using microcontrollers or data converters. It consists of a charge-
pump voltage doubler (U1), a current-sense amplifier (U2), and two n-channel MOSFETs. The sense-resistor value determines
the maximum current limit.

A similar version of this article appeared in the May 18, 2009 issue of EE Times magazine.

Available integrated circuits can let you program a current limit, but they generally involve microcontrollers or data conve