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PM6641：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

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