Monday, July 30, 2012

External Shutdown Function Circuit to the LP2954 LDO Regulator

The LP2954 doesn’t have an electronic shutdown built in, the circuit diagram bellow performshow to add external shutdown function to this5V LDO regulator which provides 5V output at load currents up to 250mA.
power shutdown circuit for LDO regulator
This is alow-power shutdown circuitwhich can be added by using a P-FET in the input lead as an On/Off switch. The switch threshold is between 1V and 3V to be a "logic level" type of the FET. If the load current is < 300 mA, there are FET devices available which have very low power losses at these currents.


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