Date: 11/04/2009

Synchronous buck regulator reference design from Fairchild Semiconductor

Fairchild Semiconductor has made available a buck type DC/DC power supply reference design using its IC FAN21SV06. The broad application areas which can utilize this reference design includes telecom, servers, set-top boxes and consumer applications.

The reference design called RD278 is 95 percent power efficient at some load conditions and I/O voltage conditions and operates over an input voltage range from 8V to 20V. FAN21SV06 can be configured to operate in either master or slave mode. In slave mode, the regulator accepts external synchronizing signals and synchronizes the output switching frequency with the input signal. The output voltage, switching frequency and current limit functions on this design can be reconfigured to suit the application by changing few components.

The FAN21SV06 integrates a controller, driver and power MOSFETs with an output current rating of 6 Amps.