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廬

ISL6537A

Data Sheet

February 9, 2005

FN9143.3

ACPI Regulator/Controller for

Dual Channel DDR Memory Systems

The ISL6537A 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 to

supply V

DDQ

during S0/S1 and S3 states. During S0/S1 state,

a fully integrated sink-source regulator generates an accurate

(V

DDQ

/2) high current V

TT

voltage without the need for a

negative supply. A buffered version of the V

DDQ

/2 reference is

provided as V

REF

. A second PWM controller, which requires

external MOSFET drivers, is available for regulation of the

GMCH Core voltage. An LDO controller is also integrated for

the CPU V

TT

termination voltage regulation and the DAC.

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. The switching

regulator provides a maximum static regulation tolerance of

鹵

2% over line, load, and temperature ranges. The output is

user-adjustable by means of external resistors down to 0.8V.

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 VIDPGD signal

indicates that the GMCH and CPU V

TT

termination voltage

is within spec and operational.

All outputs, except VDAC, have undervoltage protection.

The switching regulator also has overvoltage and

overcurrent protection. Thermal shutdown is integrated.

Features

鈥?Generates 5 Regulated Voltages

- Synchronous Buck PWM Controller for DDR V

DDQ

- 3A Integrated Sink/Source Linear Regulator with

Accurate VDDQ/2 Divider Reference for DDR V

TT

- PWM Regulator for GMCH Core

- LDO Regulator for CPU/GMCH V

TT

Termination

- LDO Regulator for DAC

鈥?ACPI compliant sleep state control

鈥?Glitch-free Transitions During State Changes

鈥?Integrated V

REF

Buffer

鈥?V

DDQ

PWM Controller Drives Low Cost N-Channel

MOSFETs

鈥?250kHz Constant Frequency Operation

- Both PWM controllers are Phase Shifted 180擄

鈥?Tight Output Voltage Regulation

- All Outputs:

鹵

2% Over Temperature

鈥?Fully-Adjustable Outputs with Wide Voltage Range: Down

to 0.8V supports DDR and DDR2 Specifications

鈥?Simple Single-Loop Voltage-Mode PWM Control Design

鈥?Fast PWM Converter Transient Response

鈥?Under and Overvoltage Monitoring

鈥?OCP on the V

DDQ

Switching Regulator

鈥?Integrated Thermal Shutdown Protection

鈥?Pb-Free Available (RoHS Compliant)

Pinout

LGATE

ISL6537A (QFN)

TOP VIEW

PHASE

OCSET

UGATE

BOOT

GND

S5#

Applications

鈥?Single and Dual Channel DDR Memory Power Systems in

ACPI compliant PCs

鈥?Graphics cards - GPU and memory supplies

21

20

19

DRIVE3

FB3

PWM4

FB4

COMP4

COMP

FB

28

5VSBY

S3#

P12V

GND

DDR_VTT

DDR_VTT

VDDQ

1

2

3

4

5

6

7

8

VDDQ

27

26

25

24

23

22

鈥?ASIC power supplies

鈥?Embedded processor and I/O supplies

鈥?DSP supplies

GND

29

18

17

16

15

Ordering Information

PART NUMBER

ISL6537ACR

ISL6537ACRZ

(See Note)

TEMP. RANGE

(擄C)

0 to 70

0 to 70

PACKAGE

28 Ld 6x6 QFN

28 Ld 6x6 QFN

(Pb-free)

PKG. DWG.

#

L28.6x6

L28.6x6

9

DDR_VTTSNS

10

DRIVE2

11

FB2

12

VIDPGD

13

VREF_OUT

14

VREF_IN

*Add 鈥?T鈥?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 are

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 321-724-7143

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2004, 2005. All Rights Reserved

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

1

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