High-Side Current Sensor Has Period Output

Abstract: The MAX4374 high-side current sense amplifier with two internal comparators is used to produce a pulse-width output signal proportional to the current being sensed. This simple circuit eliminates the need for a discrete A/D converter.
Maxim > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS

Keywords: current sense IC, high side current sense, current sense amplifier, pulse width signal output, May 31, 2002
current sense resistor

APPLICATION NOTE 1084
High-Side Current Sensor Has Period Output

Abstract: The MAX4374 high-side current sense amplifier with two internal comparators is used to produce a
pulse-width output signal proportional to the current being sensed. This simple circuit eliminates the need for a
discrete A/D converter.

High-side current monitoring is found in many battery-powered products that require accurate monitoring of load
current, charger current, or both. In non-portable applications high-side current monitoring serves as a power-
supply watchdog that can flag a failure in downstream devices. It