PM6641 datasheet(1/47 Pages) STMICROELECTRONICS

部件名	PM6641

功能描述	Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications

PDF	47 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 47 page

January 2008

Rev 2

1/47

47

PM6641

Monolithic VR for chipset and DDR2/3 supply

for ultra-mobile PC (UMPC) applications

Features

■ 0.8 V ±1 % internal voltage reference

■ 2.7 V to 5.5 V input voltage range

■ Fast response, constant frequency,

current mode control

■ Three independent, adjustable, out-of-phase

SMPS for DDR2/3 (VDDQ) and chipset supply

■ Low noise DDR2/3 reference (VTTREF)

■ ±2 Apk LDO for DDR2/3 termination (VTT)

with foldback

■ S0-S5 states compliant DDR2/3 section

■ Active soft-end for all outputs

■ Selectable tracking discharge for VDDQ

■ Separate power-good signals

■ Pulse skipping at light load

■ Programmable current limit and soft-start for

all outputs

■ Latched OVP, UVP protection

■ Thermal protection

Applications

■ DDR2/3 memory and chipset supply

■ UMPC and portable equipment

■ Handheld and PDAs

Description

The PM6641 is a monolithic voltage regulator

module specifically designed to supply DDR2/3

memory and chipset in ultra-mobile PC and real

estate constrained portable systems.

It integrates three independent, adjustable,

constant frequency buck converters, a ±2 Apk

Low Drop-Out (LDO) linear regulator and a

±15 mA low noise buffered reference.

Each regulator provides basic UV and OV

Protections, programmable Soft-Start and Current

Limit and active Soft-End.

Pulse-Skipping technique is performed to

increase efficiency at very light load.

VFQFPN-48 7x7

www.st.com

Table 1. Device summary

Part number

Package

Packaging

PM6641

VFQFPN-48 7x7 (exposed pad)

Tray

PM6641TR

VFQFPN-48 7x7 (exposed pad

Tape & reel

类似零件编号 - PM6641

制造商	部件名	数据表	功能描述
STMicroelectronics	PM6644	2Mb / 35P	350 mA adjustable step-down regulator 19-Jun-2012
STMicroelectronics	PM6644TR	2Mb / 35P	350 mA adjustable step-down regulator 19-Jun-2012

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