1

®

ACPI Regulator/Controller for

Dual Channel DDR Memory Systems

The ISL6532 provides a complete ACPI compliant power

solution for up to 4 DIMM dual channel DDR/DDR2 memory

systems. Included are both a synchronous buck controller

S0/S1 states and standby current during S3 state. During

Run mode, a fully integrated sink-source regulator generates

The switching PWM controller drives two N-Channel

MOSFETs in a synchronous-rectified buck converter

topology. The synchronous buck converter uses voltage-

mode control with fast transient response. Both the switching

regulator and integrated standby LDO provide a maximum

temperature ranges. The output is user-adjustable by means

of external resistors down to 0.8V.

Switching the memory core output between the PWM

regulator and the standby LDO during state transitions is

accomplished smoothly via the internal ACPI control

circuitry. The NCH signal provides synchronized switching of

a backfeed blocking switch during the transitions

eliminating

the need to route 5V Dual to the memory supply.

a controlled manner when returning to S0/S1 state from

S4/S5 or mechanical off states. During S0 the PGOOD signal

indicates that all supplies are within spec and operational.

Each output is monitored for under and over-voltage events.

regulators. Thermal shutdown is integrated.

Pinout

ISL6532 (QFN) TOP VIEW

Features

• Generates 2 Regulated Voltages

- Synchronous Buck PWM Controller with Standby LDO

- 3A Integrated Sink/Source Linear Regulator with

- Glitch-free Transitions During State Changes

• ACPI Compliant Sleep State Control

• PWM Controller Drives Low Cost N-Channel MOSFETs

• 250kHz Constant Frequency Operation

• Tight Output Voltage Regulation

• 5V or 3.3V Down Conversion

• Fully-Adjustable Outputs with Wide Voltage Range: Down

to 0.8V supports DDR and DDR2 Specifications

• Simple Single-Loop Voltage-Mode PWM Control Design

• Fast PWM Converter Transient Response

• Over Current Protection and Under/Over-Voltage

Monitoring of Both Outputs

• Integrated Thermal Shutdown Protection

• QFN Package Option

- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad

Flat No Leads - Product Outline

- QFN Near Chip Scale Package Footprint; Improves

PCB Efficiency, Thinner in Profile

•

Pb-free available

Applications

• Single and Dual Channel DDR Memory Power Systems in

ACPI compliant PCs

• Graphics cards - GPU and memory supplies

• ASIC power supplies

• Embedded processor and I/O supplies

• DSP supplies

NCH

PGOOD

GND

COMP

FB

5VSBY

GND

VTT

VTT

VDDQ

1

2

3

4

5

67

8

9

10

15

14

13

12

11

20

19

18

17

16

GND

21

Ordering Information

PART NUMBER

TEMP. RANGE

PACKAGE

PKG.

DWG. #

ISL6532CR

0 to 70

20 Ld 6x6 QFN

L20.6x6

ISL6532CRZ

(See Note)

0 to 70

20 Ld 6x6 QFN

(Pb-free)

L20.6x6

*Add “-T” suffix to part number for tape and reel packaging.

NOTE: Intersil Pb-free products employ special Pb-free material sets; molding

compounds/die attach materials and 100% matte tin plate termination finish, which

is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free

products are MSL classified at Pb-free peak reflow temperatures that meet or

exceed the Pb-free requirements of IPC/JEDEC J Std-020B.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2002-2004. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

ISL6532

July 2004

FN9112.3

Data Sheet