STMicroelectronics PM6641
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.| Part No. | PM6641 |
|---|---|
| Datasheet | PM6641 Download |
| Manufacturer |  STMicroelectronics |
| Description | Monolithic VR |
| Buy | Stock & Price |
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 mm
DESCRIPTION
Pulse-skipping technique is performed to increase efficiency at very light load. Table 1. Device summary Order codes PM6641 PM6641TR Package VFQFPN-48 7x7 (exposed pad) Packaging Tray Tape and reel May 2009 Doc ID 13510 Rev 3 1/47 47 Contents Contents PM6641 1 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
