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 – Programmable current limit and soft-start for all outputs – Latched OVP, UVP protection – Thermal protection STEVAL-ISA050V1 ±15 mA low noise buffered reference. Each regulator is provided of basic under voltage (UV) and over voltage (OV) protections, programmable 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 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 2 3 1 JP4 STRIP 3 1 C1 0603-1u 0603 0603-10 06 -100p C29 + C5 EL SMD C-10u 10u R6 0603-12 060 -120k R5 0603-15 060 -150k TP8 GND TP9 VOUT_1 _1S8 VCC 1 R3 0603 0603-100 100k C22 0603 330p 0603-330 R11 0603 100k 0603-100 VIN 0603-22n 06 -22n C19 603-15 15p 0603 C32 C2 08 0805-1 5-10u 1 C15 B Case - 220u C6 20u B Case - 220 2 39-1u 2839- C21 3 1 2 JP6 STRIP 3 C24 060303-330p 30p C17 C12 805-10 10u 0805 0603 33n 0603-33 C18 R10 060303-180k 80k U1 6641_Q 1_QFPN PM66 1 AVCC TP16 AGND C11 1206 206-22 22u 36 35 34 33 32 31 30 29 28 27 26 25 C9 B Case - 220u EN_VTT EN_1 _1S5 EN_1 _1S05 05 VIN_1 _1S5 VSW_1 VS _1S5_2 5_2 VSW_1 VS _1S5_1 5_1 SGND_1 _1S5_ 5_2 SGND_1 _1S5_ 5_1 VFB_1 _1S5 COMP_1 _1S5 SS_1 _1S5 PG_1 _1S5 L3 2839-1u 283 VOUT_1S05 1 TP12 12 0603-1 03-100p C31 THERMAL R9 060303-56k 6k R2 0603-4 3-4R3 06 0603-1 03-100n AGND_1 _1 SET_SWF SE VOUT_1S8 CSNS SGND_1S8_1 SGND_1S8_2 VSW_1S8_1 VS 8_1 VSW_1S8_2 VS 8_2 VIN_1S8_1 _1 VIN_1S8_2 _2 VFB_1S8 COMP_1S8 0603 0603-15 15p C33 49 1 2 3 4 5 6 7 8 9 10 11 12 R33 603-join 0603 1 TP14 14 VTT 1 TP1 VTTREF 1 AVCC AV R13 03-68k 0603- 0603-joi 3-join 06 R32 R4 0603 68k 0603-68 JP1 STRIP 3 2 0603 603-22 22n L1 2 1 STRIP 2 JP8 2 1 1 STRIP 2 JP7 0603-100n 0n 06 AVCC R1 0603-4 3-4R3 06 C16 1 1 AVCC AV 1 2 AVCC AV C4 08 -10u 0805-10u VIN GND 1 TP13 13 R31 0603-joi 03-join 1 2 VCC GND TP17 17 10u EL SMD C-10u 1 2 2839 2839-1u 1u5 VIN 603-100 100p 0603 C25 R34 06 0603-joi 3-join 1 VIN TP7 TP18 18 AUX 0603-100p -100p 060 C26 R17 060303-68k R18 060 0603-68k -68k AUX R22 603-68 68k 0603 AUX R19 060 0603-68k -68k 1 2 3 4 TP2 PG_1S8 TP3 PG_1S5 8 7 6 5 TP4 PG_1 _1S05 05 R8 0603-120 120k 0603 R7 0603 100k 0603-100 SW DIP-4 SW1 JP5 STRIP 3 0603-10 06 -100p C28 R23 603-68 68k 0603 2 + C8 EL SMD C-10u 10u 0603-100p 0p 06 C27 R21 603-68 68k 0603 AUX R20 603-68k 8k 0603- 0603 0603-100 100p C30 C7 B Case - 220u C3 0805 0805-10 10u R30 0603-joi join 0603 C23 060303-470p 70p L2 C34 0603-1 3-15p 06 1 C20 060 -22n 0603-22n R12 0603603-47k 7k JP3 STRIP 3 + C13 C10 EL SMD C-10 10u 20u B Case - 220 C14 2 AVCC 3 1 TP15 15 LDOIN 2 1 1 TP6 AGND 3 2 48 47 46 45 44 43 42 41 40 39 38 37 VCC VTT_FB DSCG VTTREF LDO_IN VTT VTT_GND AVCC AGND ND_2 SE SET_PH1 AGND ND_3 EN_1S8 SS_1S8 SS_1S05 COMP_1S05 VFB_1 _1S05 SGND ND_1 _1S05_1 SGND ND_1 _1S05_2 VSW_1S05_1 5_1 VSW_1S05_2 5_2 VIN_1 _1S05_1 VIN_1 _1S05_2 PG_1 _1S05 PG_1 _1S8 13 14 15 16 17 18 19 20 21 22 23 24 1 2 TP5 VCC + 1 1 2 3 1 1 1 2/4 TP10 10 VOUT_1S5 TP11 11 GND 1 Figure 1. 1 1 1 Circuit schematic STEVAL-ISA050V1 Circuit schematic Schematic AM03286v1 STEVAL-ISA050V1 2 Revision history Revision history Table 1. Document revision history Date Revision 12-Nov-2008 1 Changes Initial release. 3/4 STEVAL-ISA050V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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