STEVAL-ISA050V1 STMicroelectronics, STEVAL-ISA050V1 Datasheet - Page 42

• Manufacturer Part Number: STEVAL-ISA050V1
• Description: KIT EVAL PM6641 CHIPSET/DDR2/3
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA050V1

• Main Purpose: Special Purpose DC/DC, DDR Memory Supply
• Outputs And Type: 4, Non-Isolated
• Power - Output: 14.7W
• Voltage - Output: 1.05V, 1.5V, 1.8V, 0.9V
• Current - Output: 4A, 2.8A, 2.5A, 2A
• Voltage - Input: 2.7 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 750kHz
• Board Type: Fully Populated
• Utilized Ic / Part: PM6641
• Input Voltage: 2.7 V to 5.5 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: PM6641
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Monolithic Voltage Regulator
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6641
• Other names: 497-8425

Application examples
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The default switching frequency has been selected (750 kHz) and the tracking discharge
has been enabled in agreement with DDR2 JEDEC specifications. No external resistor
dividers are required for these output voltage levels. The allowed inductor current ripple is
about 35% of the expected peak load.
The power and signal components have been selected in agreement with
page 35
The following schematic and bill of materials (BOM) are for reference design.
Figure 35. Suggested schematic for DDR2 and chipset power supply
equations.
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EN_1S8
AGND_3
SET_PH1
AGND_2
DSCG
VTT_FB
AVCC
VTT_GND
VTT
LDO_IN
VTTREF
VCC
AVCC
SGND_1S05_2
SGND_1S05_1
VSW_1S05_2
VSW_1S05_1
COMP_1S05
VIN_1S05_2
VIN_1S05_1
VFB_1S05
PG_1S05
SS_1S05
PG_1S8
SS_1S8
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Chapter 8 on
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PM6641