1

TM

Microprocessor CORE Voltage Regulator

Two-Phase Buck PWM Controller

The ISL6562 two-phase current mode, PWM control IC

together with companion gate drivers, the HIP6601A,

HIP6602A, HIP6603A or HIP6604 and MOSFETs provides a

precision voltage regulation system for advanced

microprocessors. Two-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 two phase converter operating at

350kHz per phase will have a ripple frequency of 700kHz.

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 1.050V to 1.825V with an accuracy of

±0.8%.

Pull up currents on these VID pins eliminates the need for

external pull up resistors.

Another feature of this controller IC is the PWRGD monitor

circuit which is held low until the CORE voltage increases, to

within 18% of the programmed voltage. Over-voltage, 24%

above programmed CORE voltage, results in the PWRGD

output going low to indicate that the CORE is above the

specified limit. Under voltage is also detected and results in

PWRGD going low if the CORE voltage falls 18% below the

programmed level. Over-current protection folds back the

output voltage to 95mV, reducing the regulator dissipation.

These features provide monitoring and protection for the

microprocessor and power system.

Features

• Two-Phase Power Conversion

• Precision Channel Current Sharing

• Precision CORE Voltage Regulation

-

±0.8% Accuracy

• Microprocessor Voltage Identification Input

- 5-Bit VID Input

- 1.050V to 1.825V in 25mV Steps

- Programmable “Droop” Voltage

• Fast Transient Recovery Time

• Over Current Protection

• High Ripple Frequency, (Channel Frequency

Times Number of Channels). . . . . . . . . . . . .100kHz to 2MHz

Applications

• VRM8.5 Modules

• Intel® Tualatin Processor Voltage Regulator

• Low Output Voltage, High Current DC/DC Converters

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

Pinout

ISL6562 (SOIC)

TOP VIEW

Ordering Information

PART NUMBER

PACKAGE

PKG. NO.

ISL6562CB

0 to 70

16 Ld SOIC

M16.15

ISL6562CB-T

16 Ld SOIC Tape and Reel

ISL6560/62EVAL1

Evaluation Platform

VID3

VID2

VID1

VID0

VID25mV

CT

PWRGD

REF

PWM1

PWM2

VCC

FB

CS-

COMP

CS+

GND

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

File Number

9012

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

1-888-INTERSIL or 321-724-7143

Intel® is a registered trademark of Intel Corporation.

ISL6562

Data Sheet

March 2001