PM6641(2008) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PM6641
(Rev.:2008)

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

STMicroelectronics 

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

VFQFPN-48 7x7

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.

Table 1. Device summary

Part number

PM6641

PM6641TR

January 2008

Package

VFQFPN-48 7x7 (exposed pad)

VFQFPN-48 7x7 (exposed pad

Rev 2

Packaging

Tray

Tape & reel

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