Buck-Boost (Switch Mode) Regulator Provides 12V from 5-35V Supply

Posted on February 1, 2010 by Adam

This is positive buck-boost regulator circuit. Using this circuit, we can implement a step-down/up converter with a positive output voltage. This circuit produces an output voltage of 12 V. Here is the circuit :

Buck Boost Switch Mode Regulator Provides 12V from 5 35V Supply circuit schematic diagram

This circuit requieres input voltage between 5 V and 35V. The output voltage is given by Vo=Vin·D/(1-D).  The maximum output current is Iout=1x(1-D). The term (1-D) reduces current capability because only during the OFF phase, current flowing trough the internal power switch is delivered to the output. [Source: STMicroelectronics Application Note]

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