ISL6552 Intersil Corporation, ISL6552 Datasheet

ISL6552

Manufacturer Part Number

ISL6552

Description

Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL6552.pdf (18 pages)

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Microprocessor CORE Voltage Regulator

Multi-Phase Buck PWM Controller

The ISL6552 multi-phase PWM control IC together with its

companion gate drivers, the HIP6601, HIP6602 or HIP6603

and external Intersil MOSFETs provides a precision voltage

regulation system for advanced microprocessors.

Multi-phase power conversion is a marked departure from

earlier single phase converter configurations previously

employed to satisfy the ever increasing current demands of

modern microprocessors. Multi-phase converters, by

distributing the power and load current results in smaller and

lower cost transistors with fewer input and output capacitors.

These reductions accrue from the higher effective

conversion frequency with higher frequency ripple current

due to the phase interleaving process of this topology. For

example, a three phase converter operating at 350kHz will

have a ripple frequency of 1.05MHz. Moreover, greater

converter bandwidth of this design results in faster response

to load transients.

Outstanding features of this controller IC include

programmable VID codes from the microprocessor that

range from 1.05V to 1.825V with a system accuracy of ±1%.

Pull up currents on these VID pins eliminates the need for

external pull up resistors. In addition “droop” compensation,

used to reduce the overshoot or undershoot of the CORE

voltage, is easily programmed with a single resistor.

Another feature of this controller IC is the PGOOD monitor

circuit which is held low until the CORE voltage increases,

during its Soft-Start sequence, to within 10% of the

programmed voltage. Over-voltage, 15% above

programmed CORE voltage, results in the converter shutting

down and turning the lower MOSFETs ON to clamp and

protect the microprocessor. Under voltage is also detected

and results in PGOOD low if the CORE voltage falls 10%

below the programmed level. Over-current protection

reduces the regulator RMS output current to 41% of the

programmed over-current trip value. These features provide

monitoring and protection for the microprocessor and power

system.

Data Sheet

1-888-INTERSIL or 321-724-7143

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

Features

• Multi-Phase Power Conversion

• Precision Channel Current Sharing

• Precision CORE Voltage Regulation

• Microprocessor Voltage Identification Input

• Fast Transient Recovery Time

• Over Current Protection

• Automatic Selection of 2, 3, or 4 Phase Operation

• High Ripple Frequency (Channel Frequency) Times

• QFN Package:

Ordering Information

ISL6552CB

ISL6552CB-T

ISL6552CR

ISL6552CR-T

PART NUMBER

- Loss Less Current Sampling - Uses r

- ±1% System Accuracy Over Temperature

- 5-Bit VID Input

- 1.05V to 1.825V in 25mV Steps

- Programmable “Droop” Voltage

Number Channels . . . . . . . . . . . . . . . . . .100kHz to 6MHz

- Compliant to JEDEC PUB95 MO-220

- Near Chip Scale Package footprint, which improves

QFN - Quad Flat No Leads - Package Outline

PCB efficiency and has a thinner profile

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

October 2003

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

20 Ld SOIC Tape and Reel

20 Ld QFN Tape and Reel

TEMP. (

0 to 70

20 Ld SOIC

20 Ld 5x5 QFN L20.5x5

PACKAGE

DS(ON)

ISL6552

M20.3

PKG. DWG. #

FN4918.1

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