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| ISL6531 Datasheet, PDF (15/17 Pages) Intersil Corporation – Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory VDDQ and VTT Termination | |||
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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
6.34kâ¦
R20
1.43kâ¦
C30
100pF
C26
5600pF
C27
100pF
R19
3.01kâ¦
C25
15000pF
R1
3.48kâ¦
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
100â¦
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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