AN2787 datasheet(1/37 Pages) STMICROELECTRONICS

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AN2787 Datasheet(PDF) 1 Page - STMicroelectronics

Part #	AN2787

Description	Monolithic VR demonstration board for chipset

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 37 page

September 2008

Rev 1

1/37

AN2787

Application note

Monolithic VR demonstration board for chipset

and DDR2/3 supply for ultramobile PC (UMPC) applications

Introduction

PM6641 demonstration board order code: STEVAL-ISA050V1 (previously coded as

PM6641EVAL).

The PM6641 demonstration board is a monolithic voltage regulator (VR) module with

internal power MOSFETs, specifically designed to supply DDR2/3 memory and chipset in

ultramobile PC and real estate constrained portable systems.

It integrates three independent, adjustable, constant frequency buck converters, a ±2 Apk

low dropout (LDO) linear regulator, and a ±15 mA low-noise buffered reference.

Each regulator is provided with basic undervoltage (UV) and overvoltage (OV) protections,

programmable soft-start and current limit, active soft-end, and pulse skipping at light loads.

This document describes all features of the PM6641 demonstration board.

Figure 1.

PM6641 demonstration board

www.st.com

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