1

®

FN9013

ISL6223

Mobile Microprocessor CORE Voltage

Regulator Multi-Phase Buck PWM

Controller

The ISL6223 multi-phase PWM control IC together with its

companion gate drivers, the HIP6601, HIP6602 or HIP6603

and Intersil MOSFETs provides a precision voltage

regulation system for advanced mobile microprocessors. A

single-stage regulator that directly converts a battery voltage

to a microprocessor core voltage can be designed when high

voltage drivers are employed. Multiphase 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, result 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 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 0.925V to 2.00V 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 0.9V. Overvoltage, the

CORE voltage going above 2.35V, 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

below 0.9V. Overcurrent protection reduces the regulator

current to less than 25% of the programmed trip value. An

external capacitor connected to the DACOUT pin and

ground slows down the transition of the DAC output to avoid

triggering the overcurrent protection when the VID code

changes. These features provide monitoring and protection

for the microprocessor and power system.

Features

• Mobile VID Compatible Multi-Phase Power Conversion

• Precision Channel Current Sharing

• Precision CORE Voltage Regulation

-

±1% System Accuracy Over Temperature

• Microprocessor Voltage Identification Input

- 5-Bit VID Input

- 1.30V to 2.00V in 50mV Steps

- 0.925V to 1.275V in 25mV Steps

- Programmable “Droop” Voltage

• Fast Transient Recovery Time

• Over Current Protection

• High Ripple Frequency (Channel Frequency Times

Number of Channels, Two). . . . . . . . . . . .100kHz to 3MHz

Pinout

ISL6223 (SSOP)

TOP VIEW

Ordering Information

PART NUMBER

PACKAGE

PKG. NO.

ISL6223CA

0 to 70

20 Ld SSOP

M20.15

ISL6223CA-T

20 Ld SSOP Tape and Reel

ISL6223EVAL1

Evaluation Platform

ISL6223EVAL2

Evaluation Platform

11

12

13

14

15

16

17

18

20

19

10

9

8

7

6

5

4

3

2

1

VID4

VID3

VID2

VID1

VID0

FS/DIS

PWM2

PGOOD

DACOUT

NC

ISEN1

GND

NC

FB

NC

VSEN

COMP

PWM1

ISEN2

Data Sheet

February 2003

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

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2003. All Rights Reserved

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