Monolithic VR for Chipset and DDR2/3 Supply for Ultra-Mobile PC (UMPC) Applications

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.

Key Features

  • Separate Power Good signals
  • Selectable tracking discharge for VDDQ
  • Programmable current limit and soft-start for all outputs
  • Pulse skipping at light load
  • Thermal protection
  • Latched OVP, UVP protection
  • S0-S5 states compliant DDR2/3 section
  • ±2 Apk LDO for DDR2/3 termination (VTT) with foldback
  • 0.8 V ±1% internal voltage reference
  • Fast response, constant frequency, current mode control
  • 2.7 V to 5.5 V input voltage range
  • Low noise DDR2/3 reference (VTTREF)
  • Active soft-end for all outputs
  • Three independent, adjustable, out-of-phase SMPS for DDR2/3 (VDDQ) and chipset supply

Circuit Diagram

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Design

Technical Documentation

Product Specifications
Description Version Size
DS5279 DS5279: Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications 3.0 2 MB
Application Notes
Description Version Size
AN2787 AN2787: Monolithic VR demonstration board for chipset and DDR2/3 supply for ultramobile PC (UMPC) applications 1.0 2 MB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 05.2016 4 MB

Tools and Software

Evaluation Tools
Solution Evaluation Tools
eDesignSuite Support & Community



Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
PM6641TR VFQFPN 48 7x7x1.0 Tape And Reel Active - - NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
PM6641 VFQFPN 48 7x7x1.0 Tray Active - - NEC EAR99 MALAYSIA MORE INFO
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
PM6641TR ActiveVFQFPN 48 7x7x1.0IndustrialEcopack2
PM6641 ActiveVFQFPN 48 7x7x1.0IndustrialEcopack2
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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