1

®

ACPI Regulator/Controller for Dual

Channel DDR Memory Systems

The ISL6532A 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

S0/S1 state, a fully integrated sink-source regulator

without the need for a negative supply. A buffered version of

controller is also integrated for AGP core voltage regulation.

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 standby LDO provide a maximum static

ranges. The output is user-adjustable by means of external

resistors down to 0.8V.

Switching 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.

An integrated soft-start feature brings all outputs into

regulation in a controlled manner when returning to S0/S1

state from any sleep state. During S0 the PGOOD signal

Each output is monitored for under and overvoltage events.

The switching regulator has overcurrent protection. Thermal

shutdown is integrated.

Features

• Generates 3 Regulated Voltages

- Synchronous Buck PWM Controller with Standby LDO

- 3A Integrated Sink/Source Linear Regulator with

Accurate VDDQ/2 Divider Reference.

- Glitch-free Transitions During State Changes

- LDO Regulator for 1.5V Video and Core voltage

• 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

• Under and Overvoltage Monitoring on All Outputs

• OCP on the Switching Regulator

• 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 (RoHS Compliant)

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

Ordering Information

PART

NUMBER

PART

MARKING

TEMP.

RANGE

(°C)

PACKAGE

PKG.

DWG. #

ISL 6532ACR

0 to +70 28 Ld 6x6 QFN L28.6x6

(Note)

ISL6532 ACRZ 0 to +70 28 Ld 6x6 QFN

(Pb-free)

L28.6x6

ISL6532AIRZ*

(Note)

ISL6532 AIRZ -40 to +85 28 Ld 6x6 QFN

(Pb-free)

L28.6x6

*Add “-T” suffix for tape and reel.

**Add “-TK” suffix for tape and reel. Please refer to TB347 for details on

reel specifications

NOTE: These Intersil Pb-free plastic packaged products employ special

Pb-free material sets; molding compounds/die attach materials and 100%

matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS

compliant and 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-020.

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

1-888-INTERSIL or 1-888-468-3774

Copyright © Intersil Americas Inc. 2002-2004, 2007. All Rights Reserved

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

ISL6532A

Data Sheet

May 5, 2008

FN9099.5