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Simple Synchronous Buck Converter Design - MCP1612

From Microchip Technology, Inc.
 

 
The density of portable electronic equipment requires the design engineer to pay particular attention to a number of important design parameters. For the power conversion circuitry, two of these parameters are the efficiency and the total circuitry footprint. Keeping the efficiency high extends battery life and controls the temperature rise of the equipment. Limiting the circuitry footprint helps minimize the size of the Printed Circuit Board (PCB) and, ultimately, the total cost of the device. The MCP1612 is an ideal choice for such a design. Since both the switching and synchronous MOSFETs are internal and switching is 1.4 MHz, the inductor, input and output capacitor size is minimized. The output voltage is set by using a simple resistor divider, with a high-bandwidth loop being accomplished by a series resistor capacitor to ground. Efficiencies of 90% and a typical shutdown current of 0.01 µA help to extend battery life.
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