AN2787 Datasheet, PDF (1/37 Pages) STMicroelectronics – Monolithic VR demonstration board for chipset

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
September 2008
Rev 1
1/37
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