AN2937 datasheet(1/41 Pages) STMICROELECTRONICS

Part #	AN2937

Description	Power system demonstration kit based on the PM6686 dual

PDF	41 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 41 page

August 2009

Doc ID 15418 Rev 1

1/41

AN2937

Application note

Power system demonstration kit based on the PM6686 dual

step-down controller with adjustable voltages and adjustable LDO

Introduction

The PM6686 is a dual step-down controller with adjustable output voltages, adjustable LDO

and charge pump circuit for notebook power systems. The PM6686 demonstration kit for

system supply represents a typical application circuit, and allows testing of all the functions

of the PM6686 device. It provides two switching sections with 5 V (OUT1) and 3.3 V (OUT2)

outputs from 8 V to 28 V input battery voltage. The operating switching frequency of the two

sections is 400 kHz and 300 kHz, respectively. Each switching section delivers more than 5

A of output current. An internal linear regulator can provide 5 V at 100 mA peak current. The

charge pump circuit provides an auxiliary 12 V output voltage.

Figure 1.

PM6686 demonstration kit for system supply

www.st.com

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