low power switching regulator

  
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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 - schematic

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



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