low power switching regulator

Posted on Feb 4, 2014

This circuit is a simple battery-powered switching regulator provides 5V out from a 9V source with 80% efficiency and 50-mA output capability. When Q1 is oon, its collector voltage rises, forcing current trhough the iinductor. The output voltage rises, causing A1`s output to rise. Q1 cutts off and the output drops low enough for A1 to turn Q1.

low power switching regulator
Click here to download the full size of the above Circuit.

The 1 uF capacitor ensures low battery impedance at high frequencies, preventing sag during switching. See schematic diagram below :

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