Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
DescriptionThe 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 mmTable 1.Device summaryOrder codesPackagePackagingPM6641VFQFPN-48 7x7 (exposed pad)TrayPM6641TRTape and reelwww.st.com ContentsPM66412/47 Doc ID 13510 Rev 3Contents1Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1Connections . . . . . . . . . . . . . . . . . . . . . . Features 0.8 V 1% internal voltage reference2.7 V to 5.5 V input voltage range Fast response, constant frequency, current mode control Three independent, adjustable, out-of-phase Low noise DDR2/3 reference (VTTREF)2 Apk LDO for DDR2/3 termination (VTT)with foldbackS0-S5 states compliant DDR2/3 sectionActive soft-end for all outputsSelectable tracking discharge for VDDQPulse skipping at light loadProgrammable current limit and soft-start for all outputsLatched OVP, UVP protectionThermal protectionApplications DDR2/3 memory and chipset supplyUMPC and portable equipmentHandheld and PDAsDescriptionThe 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, progr May 2009Doc ID 13510 Rev 31/4747 PM6641Monolit
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COMP_1S05, SS_1S05, VTT3IVTTFB, FB_1SX, V40mAVTTREF, PM6641EVAL, VFB_1SX, S0-S3, VSW_1S5, DDR2-3, V-22, PG_1S05, VEN_1S5, Ron100160mRDSon,LSLow, VIN_1S5, A-3535, SGND_1S8, VTT110AILDOIN,STRLDO, EN_1S8, V25nAI, PM6641, VFB_1S8, Ron90130mRDSon,LSLow, VSW_1S05, DDR2, V,-2, INLEAKVIN_1S8, VEN_1S05, Ron100160I, VIN_1S05, A-2525EN_1S8, SGND_1S5, VTT10, EN_1S5, V1AVPG,LOWPG_x, PG_1S8, VFB_1S5, Ron80120I, VSET_PH1, COMP_1S8, SS_1S8, INLEAKVIN_1S5, VCC675750825RSETSWF, PM6641VIN_1S05, VFQFPN-48, 48VCC5, SGND_1S05, VSW_1S8, EN_1S05, V1AVIN, PG_1S5SS_1S5, VFB_1S05, Ron70110I, VOUT_1S8, COMP_1S5, SS_1S5, VVOUT_1S8, INLEAKVIN_1S05, V792800808mVI, PM6641Pin, VFB_S1X, 32PM6641, SET_PH1, VSW_1S5SGND_1S5, DDR2/3, V1AV, PG_1S5, VEN_1S8, Ron150220mRDSon,LSLow, VIN_1S8
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