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廬

ISL6548

Data Sheet

February 9, 2005

FN9188.1

ACPI Regulator/Controller for

Dual Channel DDR Memory Systems

The ISL6548 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. Two LDO controllers are also

integrated for the GMCH core voltage regulation and for the

GMCH/CPU V

TT

termination 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. 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/CPU V

TT

termination voltage is

within spec and operational.

Each output is monitored for undervoltage events. The

switching regulator also has overvoltage and overcurrent

protection. Thermal shutdown is integrated.

Features

鈥?Generates 4 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

- LDO Regulator for GMCH Core

- Sink/Source LDO Regulator for CPU/GMCH V

TT

Termination

鈥?ACPI compliant sleep state control

鈥?Glitch-free Transitions During State Changes

鈥?PWM Controller Drives Low Cost N-Channel MOSFETs

鈥?250kHz Constant Frequency Operation

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 on All Outputs

鈥?OCP on the Switching Regulator

鈥?Integrated Thermal Shutdown Protection

鈥?Pb-Free Available (RoHS Compliant)

Applications

鈥?Single and Dual Channel DDR Memory Power Systems in

ACPI compliant PCs

鈥?Graphics cards - GPU and memory supplies

鈥?ASIC power supplies

鈥?Embedded processor and I/O supplies

鈥?DSP supplies

Pinout

ISL6548 (6x6 QFN)

TOP VIEW

OCSET

22

21 DRIVE4

20 REFADJ4

19 DRIVE3

GND

29

18 FB3

17 FB4

16 COMP

15 FB

8

VDDQ

9

DDR_VTTSNS

10

DRIVE2_U

11

FB2

12

VIDPGD

13

DRIVE2_L

14

VREF_IN

PHASE

24

UGATE

LGATE

BOOT

GND

S5#

23

28

5VSBY

S3#

P12V

GND

DDR_VTT

DDR_VTT

VDDQ

1

2

3

4

5

6

7

27

26

25

Ordering Information

TEMP.

PART NUMBER RANGE (擄C)

ISL6548CRZ

(Note)

ISL6548CRZ-T

(Note)

ISL6548CRZ A

(Note)

ISL6548CRZA-T

(Note)

0 to 70

0 to 70

0 to 70

0 to 70

PACKAGE

PKG.

DWG. #

28 Ld 6x6 QFN (Pb-free) L28.6x6

28 Ld 6x6 QFN

L28.6x6

Tape and Reel (Pb-free)

28 Ld 6x6 QFN (Pb-free) L28.6x6

28 Ld 6x6 QFN

L28.6x6

Tape and Reel (Pb-free)

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.

1

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. 2005. All Rights Reserved

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

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