STEVAL-ISA050V1

STEVAL-ISA050V1 Monolithic VR for chipset and DDR2/3 demonstration board based on the PM6641 Data Brief Features Switching section 0.8 V 1% voltage reference 2.7 V to 5.5 V input voltage range Fast response, constant frequency, current mode control Three independent, adjustable, SMPS For DDR2/3 (VDDQ) and chipset supply S3-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 STEVAL-ISA050V1 Programmable current limit and soft-start 15 mA low noise buffered reference. Each for all outputs regulator is provided of basic under voltage (UV) Latched OVP, UVP protection and over voltage (OV) protections, programmable Thermal protection soft-start and current limit, active soft-end and pulse-skipping at light loads. Reference and termination voltages (VTTREF and VTT) 2 Apk LDO for DDR2/3 termination (VTT) with fold back Remote VTT output sensing High-Z VTT output in S3 15 mA low noise DDR2/3 buffered reference (VTTREF) Application Supply for ultra-mobile PC (UMPC) Description The STEVAL-ISA050V1 demonstration board is based on the PM6641, that is a monolithic voltage regulator module, with internal Power MOSFET, specifically designed to supply DDR2/3 memory and chipset in ultra-mobile PC and real estate portable systems. It integrates three independent, adjustable, constant frequency buck converters, a 2 Apk low drop-out (LDO) linear regulator and a November 2008 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Circuit schematic STEVAL-ISA050V1 1 Circuit schematic Figure 1. Schematic + AM03286v1 2/4 AVAVCC TP1 TP5 TP6 TP1515 TP1414 TP16 VTTREF VCC AGND LDOIN VTT AGND JP1 TP1818 2 AUX STRIP 3 060603-joi3-join AVCC AUX R2 060603-43-4R3 R34 VCC JP3 STRIP 3 R1 2 0606033-4-4R3 C17 C1 AVCC 0603-103-100n 1 00603603-1u C11 C16 1220606-2222u 006603-1000nn AUX TP9 C18 VOUT 11S8 00603603-3333n R20 R21 R22 R23 0603-603-68k8k 0603603-6688k 0603603-6868k 0660303-6688k SW1 1 8 2 7 JP7 JP8 3 6 1 1 4 5 AVCC R5 2 2 0060603-15-150k C25 C26 C27 C28 SW DIP-4 C12 STRIP 2 STRIP 2 0880505-1010u 0660303-110000p 0600603-100p-100p 060603-1000pp 006603-10-100p R6 JP4 0060603-12-120k R3 R4 2 06030603-100100k 00603603-6868k R33 VIN STRIP 3 0660303-join TP1010 C3 08050805-1010u VOUT 1S5 + C5 EL SMD C-110u0u C15 L2 TP8 C6 B Case - 2220u20u 1 2 R7 GND B Case - 22200u 1 36 00603603-110000k AGND 11 EN VTT 2 35 28392839-1u1u5 SSEET SWF EN 1 1S5 + 3 34 C8 VOUT 1S8 EN 11S0055 4 33 C7 R8 EL SMD C-10u10u CSNS VIN 1 1S5 B Case - 220u220u 5 U1 32 JP5 06030603-112020k SGND 1S8 1 VSVSW 1 1S5 25 2 6 31 2 L1 STRIP 3 SGND 1S8 2 VVSSW 1 1S5 15 1 1 2 7 30 VSVSW 1S88 1 1 SGND 11S5 5 2 TP1111 8 PM666641 Q1 QFPN 29 R12 C23 VSVSW 1S88 2 2 SGND 11S5 5 1 GND C2 2839-39-1u 9 28 06603-03-477kk 06003-3-4770p0p VIN 1S8 11 VFB 1 1S5 080805-15-10u 10 27 VIN 1S8 22 COMP 11S5 11 26 C30 VFB 1S8 SS 1 1S5 VIN 12 25 COMP 1S8 PG 1 1S5 C34 06030603-100100p 006603-13-15p C29 R32 R11 49 THERMAL 006603-10-100p 00603603-100100k C32 C20 0060603--22n22n 0606033-joi-join 0660303-1515p C22 00603603-330330p C19 C33 006603-22n-22n R13 L3 VIN 06003-3-68k 06030603-1155p C31 2832839-1u C21 0603-103-100p C24 0660303-2222n 06003-3-3330p0p C4 TP3 TP2 TP4 008805-10u-10u AUX PG 1S5 PG 1S8 PG 11S0055 R17 R18 R19 + C13 06003-3-68k 0600603--68k68k 0600603--68k68k C10 EL SMD C-1010u C9 B Case - 22020u C14 B Case - 2220u20u 2 1 EL SMD C-10u10u R9 06003-3-566kk TP1122 TP1133 TP1177 TP7 R10 1 1 1 JP6 06003-3-1880k0k 1 2 STRIP 3 VOUT 1S05 GND GND VIN R31 0603-joi03-join R30 06030603-joijoin VCC 1 3 1 1 2 1 1 1 AVAVCC 1 AVAVCC 1 3 1 3 1 13 48 SS 1S8 VCC 14 47 SS 1S05 VTT FB 15 46 COMP 1S05 DSCG 16 45 VFB 1 1S05 VTTREF 17 44 SGNDND 1 1S05 1 LDO IN 18 43 1 SGNDND 1 1S05 2 VTT 19 42 VSW 1S055 1 1 VTT GND 1 2 20 41 VSW 1S055 2 2 AVCC 21 40 VIN 1 1S05 1 AGNNDD 2 22 39 VIN 1 1S05 2 SESET PH1 23 38 PG 1 1S05 AGNNDD 3 24 37 2 PG 1 1S8 EN 1S8 1 2 1 1 3 1 2 1 1 1 3 1 1 1 1