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PM6641 Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6641 Datasheet(HTML) 1 Page - STMicroelectronics |
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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 |
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