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廬

ISL8502

Data Sheet

January 17, 2007

FN6389.0

2.5A Synchronous Buck Regulator with

Integrated MOSFETs

The ISL8502 is a synchronous buck controller with internal

MOSFETs packaged in a small 4mmx4mm QFN package.

The ISL8502 can support a continuous load of 2.5A and has

a very wide input voltage range. With the switching

MOSFETs integrated into the IC, the complete regulator

footprint can be very small and provide a much more

efficient solution than a linear regulator.

The ISL8502 is capable of stand alone operation or it can be

used in a master slave combination for multiple outputs that

are derived from the same input rail. Multiple slave channels

(up to six) can be synchronized. This method minimizes the

EMI and beat frequencies effect with multi-channel

operation.

The switching PWM controller drives two internal 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

鹵

1% over line, load, and temperature ranges. The output is

user-adjustable by means of external resistors down to 0.6V.

The output is monitored for undervoltage events. The

switching regulator also has overcurrent protection. Thermal

shutdown is integrated. The ISL8502 features a bidirectional

Enable pin that allows the part to pull the enable pin low

during fault detection.

Features

鈥?Over 2.5A Continuous Output Current

鈥?Integrated MOSFETs for Small Regulator Footprint

鈥?Adjustable Switching Frequency, 500kHz - 1.2MHz

鈥?Tight Output Voltage Regulation,

鹵

1% Over Temperature

鈥?Wide Input Voltage Range, 5V

鹵

10% or 5.5V to 14V

鈥?Wide Output Voltage Range, from 0.6V

鈥?Simple Single-Loop Voltage-Mode PWM Control Design

鈥?Input Voltage Feed-Forward for Constant Modulator Gain

鈥?Fast PWM Converter Transient Response

鈥?Lossless r

DS(ON)

High Side and Low Side Overcurrent

Protection

鈥?Undervoltage Detection

鈥?Integrated Thermal Shutdown Protection

鈥?Power Good Indication

鈥?Adjustable Soft-Start

鈥?Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

鈥?Point of Load Applications

鈥?Graphics Cards - GPU and Memory Supplies

鈥?ASIC Power Supplies

鈥?Embedded Processor and I/O supplies

鈥?DSP Supplies

Pinout

ISL8502

(24 LD QFN)

TOP VIEW

BOOT

PVCC

Ordering Information

VCC

VIN

VIN

VIN

24

PGOOD

SGND

EN

SYNCH

M/S

FS

1

2

3

4

5

6

7

COMP

8

FB

9

SS

10

PGND

11

PGND

12

PGND

GND

25

23

22

21

20

19

18 VIN

17 PHASE

16 PHASE

15 PHASE

14 PHASE

13 PGND

PART

NUMBER

ISL8502IRZ*

(Note)

PART

TEMP.

MARKING RANGE (擄C)

85 02IRZ

-40 to +85

PACKAGE

PKG.

DWG. #

24 Ld 4x4 QFN L24.4x4D

(Pb-free)

*Add 鈥?T鈥?suffix for tape and reel.

NOTE: Intersil Pb-free plus anneal 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.

1

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

1-888-INTERSIL or 1-888-468-3774

|

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

Copyright 漏 Intersil Americas Inc. 2006, 2007. All Rights Reserved

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

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