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ISL6532C

ACPI Regulator/Controller for Dual Channel DDR Memory Systems

Renesas Electronics 

ISL6532C

NOT RECOMMENDED FOR NEW DESIGNS

NO RECOMMENDED REPLACEMENT

contact our Technical Support Center at

1-888-INTERSIL or www.intersil.com/tsc

ACPI Regulator/Controller for Dual Channel DDR Memory Systems

DATASHEET

FN9121

Rev 2.00

Jul 2004

The ISL6532C 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

and integrated LDO to supply VDDQ with high current during

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

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

generates an accurate (VDDQ/2) high current VTT voltage

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

the VDDQ/2 reference is provided as VREF. An LDO

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

regulation tolerance of 2% over line, load, and temperature

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

indicates VTT is within spec and operational.

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

The switching regulator has over current protection. Thermal

shutdown is integrated.

Pinout

ISL6532C (QFN) TOP VIEW

28 27 26 25 24 23 22

GNDP 1

21 PGOOD

5VSBY 2

20 PHASE

GNDQ 3

19 DRIVE2

GNDQ 4

18 FB2

VTT 5

17 GNDA

VTT 6

16 COMP

VDDQ 7

15 FB

8 9 10 11 12 13 14

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

• Integrated VREF Buffer

• PWM Controller Drives Low Cost N-Channel MOSFETs

• 250kHz Constant Frequency Operation

• Tight Output Voltage Regulation

- All Outputs: 2% Over Temperature

• 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 Over-voltage Monitoring on All Outputs

• OCP on the Switching Regulator and VTT

• 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

Ordering Information

TEMP. RANGE

PART NUMBER

(oC)

PACKAGE PKG. DWG. #

ISL6532CCR

0 to 70

28 Ld 6x6 QFN L28.6x6

ISL6532CCRZ

(See Note)

0 to 70

28 Ld 6x6 QFN L28.6x6

(Pb-free)

*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.

FN9121 Rev 2.00

Jul 2004

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