ISL6530/31EVAL1 데이터 시트보기 (PDF) - Intersil

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ISL6530/31EVAL1

Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory VDDQ and VTT Termination

Intersil 

ISL6531

ISL6531 DC-DC Converter Application Circuit

Figure 11 shows an application circuit for a DDR SDRAM

power supply, including VDDQ (+2.5V) and VTT (+1.25V).

Detailed information on the circuit, including a complete

Billof-Materials and circuit board description, can be found

+5V

inApplication Note AN9993-of-Materials and circuit board

description, can be found in Application Note AN9993

Application Note AN9993-of-Materials and circuit board

description, can be found in Application Note AN9993.

R26

6.34kΩ

R20

1.43kΩ

C30

100pF

C26

5600pF

C27

100pF

R19

3.01kΩ

C25

15000pF

R1

3.48kΩ

C1

1000pF

C2

0.1µF

D1

OCSET/SD

V2_SD

PGOOD

VCC

BOOT1

UGATE1

C3

C4,5

1.0µF 150µF(x2)

Q1

VREF

VREF_IN

GNDA

ISL6531

PHASE1

PVCC1

LGATE1

PGND1

COMP1

BOOT2

UGATE2

FB1

SENSE1

PHASE2

LGATE2

PGND2

SENSE2

C6

0.1µF

L1

1µH

Q2

C15

0.1µF

D2

C16

0.1µF

C17

1.0µF

L2

1µH

Q3

VDDQ

@10A

C7,8,9,10

150µF(x4)

VTT

@5A

C18,19

150µF(x2)

R25

100Ω

Component Selection Notes:

C4,5,7,8,9,10,18,19 - Each 150mF, Panasonic EEF-UE0J151R

D1,2 - Each 30mA Schottky Diode, MA732

L1,2 - Each 1mH Inductor, Panasonic P/N ETQ-P6F1ROSFA

Q1,2 - Each Fairchild MOSFET; ITF86130DK8

Q3 - Fairchild MOSFET; ITF86110DK8

FIGURE 11. DDR SDRAM VOLTAGE REGULATOR

15

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