PM6641
Monolithic VR for Chipset and DDR2/3 Supply for Ultra-Mobile PC (UMPC) Applications-
Active
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.
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Datasheet
Key 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
Circuit Diagram
Design Resources
TopTechnical Documentation
Product Specifications
| Description | Version | Size |
|---|---|---|
DS5279: Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
|
3.0 | 2,255 KB |
Application Notes
| Description | Version | Size |
|---|---|---|
|
AN2787: Monolithic VR demonstration board for chipset and DDR2/3 supply for ultramobile PC (UMPC) applications
|
1.0 | 2,594 KB |
Presentations & Training Material
Presentations
| Description | Version | Size |
|---|---|---|
|
LED Solutions for LCD Backlighting
|
1.0.1 | 1,231 KB |
Related Tools and Software
Related Tools and Software
| Part Number | Description |
|---|---|
| STEVAL-ISA050V1 | Monolithic VR for chipset and DDR2/3 demonstration board based on the PM6641 Monolithic VR for Chipset and DDR2/3 Supply for Ultra-Mobile PC (UMPC) applications |
Sample & Buy
Top| Part Number | Marketing Status | Package | Packing Type | Automotive Grade | Order From ST | Unit Price (US$)* @ | Distributor Availability | RoHS Compliance Grade | Download Material Declaration** |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM6641 | Active | VFQFPN 48 7x7x1.0 | Tray | _ | - |
| Ecopack2 | PDF XML | |||||||||||||||||||||
| PM6641TR | Active | VFQFPN 48 7x7x1.0 | Tape And Reel | _ |
| Ecopack2 | PDF XML | ||||||||||||||||||||||
(*) 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 (**) 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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