ISL6537A Intersil Corporation, ISL6537A Datasheet

ISL6537A

Manufacturer Part Number

ISL6537A

Description

ACPI Regulator/Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL6537A.pdf (15 pages)

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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

a fully integrated sink-source regulator generates an accurate

negative supply. A buffered version of the V

provided as V

external MOSFET drivers, is available for regulation of the

GMCH Core voltage. An LDO controller is also integrated for

the CPU V

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

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

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.

Pinout

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

DDQ

DDR_VTT

5VSBY

VDDQ

P12V

/2) high current V

GND

S3#

DDQ

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

REF

termination voltage regulation and the DAC.

. A second PWM controller, which requires

ISL6537A (QFN)

TOP VIEW

voltage without the need for a

GND

Data Sheet

termination voltage

DDQ

/2 reference is

DRIVE3

FB3

PWM4

FB4

COMP4

COMP

1-888-INTERSIL or 321-724-7143

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

Features

• Generates 5 Regulated Voltages

• ACPI compliant sleep state control

• Glitch-free Transitions During State Changes

• Integrated V

• V

• 250kHz Constant Frequency Operation

• Tight Output Voltage Regulation

• Fully-Adjustable Outputs with Wide Voltage Range: Down

• Simple Single-Loop Voltage-Mode PWM Control Design

• Fast PWM Converter Transient Response

• Under and Overvoltage Monitoring

• OCP on the V

• Integrated Thermal Shutdown Protection

• Pb-Free Available (RoHS Compliant)

Applications

• Single and Dual Channel DDR Memory Power Systems in

• Graphics cards - GPU and memory supplies

• ASIC power supplies

• Embedded processor and I/O supplies

• DSP supplies

Ordering Information

ISL6537ACR

ISL6537ACRZ

(See Note)

*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 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.

PART NUMBER

- Synchronous Buck PWM Controller for DDR V

- 3A Integrated Sink/Source Linear Regulator with

- PWM Regulator for GMCH Core

- LDO Regulator for CPU/GMCH V

- LDO Regulator for DAC

MOSFETs

- Both PWM controllers are Phase Shifted 180°

- All Outputs:

to 0.8V supports DDR and DDR2 Specifications

ACPI compliant PCs

DDQ

Accurate VDDQ/2 Divider Reference for DDR V

February 9, 2005

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

PWM Controller Drives Low Cost N-Channel

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

REF

DDQ

TEMP. RANGE

2% Over Temperature

Buffer

0 to 70

Switching Regulator

(°C)

(Pb-free)

28 Ld 6x6 QFN

PACKAGE

ISL6537A

Termination

FN9143.3

DDQ

PKG. DWG.

L28.6x6

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