Micropower Circuit Monitors Positive Supply Current

Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier.
Maxim > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS

Keywords: positive supply current, monitoring, load current, power supply, opamp, operational amplifiers, op Jul 09, 1998
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APPLICATION NOTE 69
Micropower Circuit Monitors Positive Supply Current

Abstract: The following application note shows a circuit that converts the load current of a positive power
supply into a ground referenced signal voltage using the ICL7612 operational amplifier.


The inexpensive circuit of Figure 1 converts the load current of a positive power supply to a ground-referenced
signal voltage, without recourse to the instrumentation amplifier, extra power supply, and matched sets of
resistors typical of such circuits. The output current IO (proportional to supply current) flows through RO to
produce VO. Be