STEVAL-ISA051V1 STMicroelectronics

STEVAL-ISA051V1 Complete DDR2/3 memory power supply controller evaluation board based on the PM6670S Data Brief Features 4.5 V to 28 V input voltage range 0.9 V, 1% voltage reference 1.8 V (DDR2) or 1.5 V (DDR3) fixed output voltages 0.9 V to 2.6 V adjustable output voltage 1.237 V 1% reference voltage available Very fast load transient response Constant on-time loop control No R current sensing using the R SENSE DS(on) of the low-side MOSFETs STEVAL-ISA051V1 Negative current limit Latched OVP, UVP and thermal shutdown The device is fully compliant with system sleep Fixed 3 ms soft-start states S3 and S4/S5, providing LDO output high impedance in suspend-to-RAM and tracking Selectable pulse-skipping at light load discharge of all outputs in suspend-to-disk. Selectable no-audible (33 kHz) pulse-skip mode All ceramic output capacitors application supported Output voltage ripple compensation Description This evaluation board is based on the PM6670S and represents a complete DDR2/3 power supply regulator for portable applications designed to meet JEDEC specifications. It integrates a constant on-time (COT) buck controller, a 2 Apk sink/source low drop-out regulator and a 15 mA low noise buffered reference. The COT architecture assures fast transient response supporting both polymeric and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. The 2 Apk sink/source linear regulator provides the memory termination voltage with fast load transient response. February 2008 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Obsolete Product(s) - Obsolete Product(s)Circuit schematic STEVAL-ISA051V1 1 Circuit schematic Figure 1. Schematic + 2/4 Obsolete Product(s) - Obsolete Product(s) AAVVCC TP1 TP5 TP6 TP15 TP14 TP16 VTTREF VCC AGND LDOIN VTT AGND JP1 TP18 2 AUX STRIP 3 060603-joi3-join AVCC AUX R2 060603-43-4R3 R34 VCC JP3 STRIP 3 R1 2 006603-4-4R3 C17 C1 AVCC 0603-103-100n 1 00603603-1u C11 C16 1206206-2222u 006603-100n AUX TP9 C18 VOUT 1 1S8 06030603-3333n R20 R21 R22 R23 0603-03-68k8k 0660303-6688k 0603603-6868k 0603603-6868k 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 0805805-1100u 0603603-110000p 0600603-100p-100p 060603-100p 006603-10-100p R6 JP4 0060603-12-120k R3 R4 VIN 2 STRIP 3 00603603-100100k 00603603-6688k R33 0603603-join TP10 C3 VOUT 1S5 08050805-1010u + C5 EL SMD C-1100u C15 L2 TP8 C6 B Case - 2220u20u 1 2 R7 GND B Case - 22200u 1 36 00603603-100100k AGNDND 1 EN VTT 2 35 28392839-11uu5 SSEET SWF EN 11S5 + 3 34 C8 VOUT 1S8 EN 1 1S05 4 33 C7 R8 EL SMD C-1100u CSNS VIN 11S5 5 U1 32 B Case - 220u220u JP5 00603603-112020k SGNNDD 1S8 1 VSVSW 11S5 5 2 L1 6 31 2 STRIP 3 SGNDND 1S8 2 VVSSW 1 1S5 5 1 1 2 7 30 VVSSW 1S88 1 SGND 11S5 5 2 TP11 8 PM6666411 Q QFPN 29 R12 C23 VVSSW 1S88 2 SGND 11S5 5 1 C2 2839-39-1u 9 28 06603-03-47k7k 0603-03-470p70p GND VIN 1S8 1 VFB 1 1S5 008805-15-10u 10 27 VIN 1S8 2 COMP 11S5 11 26 C30 VFB 1S8 SS 1 1S5 VIN 12 25 COMP 1S8 PG 11S5 C34 06030603-110000p 060603-13-15p C29 R32 R11 49 THERMAL 060603-10-100p 00603603-100100k C32 C20 0600603-22n-22n 0066033-joi-join 0603603-1515p C22 00603603-330330p C19 C33 006603-22n-22n R13 L3 VIN 06003-3-68k 00603603-1155p C31 2832839-1u C21 0603-103-100p C24 0603603-2222n C4 TP3 TP2 TP4 0603-03-330p30p 080805--10u10u AUX PG 1S5 PG 1S8 PG 11S05 R17 R18 R19 + C13 0603-03-68k 0600603--68k68k 0060603-68k-68k C10 EL SMD C-1100u C9 B Case - 22200u C14 B Case - 2220u20u 2 1 EL SMD C-1100u R9 0603-03-56k6k TP12 TP13 TP17 TP7 R10 1 1 1 JP6 0603-03-180k80k 1 2 STRIP 3 VOUT 1S05 GND GND VIN R31 06003-joi3-join R30 00603603-jjoioin VCC 1 3 1 1 2 1 1 1 AAVVCC 1 AAVVCC 1 3 1 3 1 13 48 SS 1S8 VCC 14 47 SS 1S05 VTT FB 15 46 COMP 1S05 DSCG 16 45 VFB 11S05 VTTREF 17 44 SGNNDD 1 1S05 1 LDO IN 18 43 1 SGNNDD 11S05 2 VTT 19 42 VSW 1S055 1 VTT GND 1 2 20 41 VSW 1S055 2 AVCC 21 40 VIN 1 1S05 1 AGNNDD 2 22 39 VIN 1 1S05 2 SESET PH1 23 38 PG 11S05 AGNNDD 3 24 37 2 PG 11S8 EN 1S8 1 2 1 1 3 1 2 1 1 1 3 1 1 1 1