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廬

ISL8104

Data Sheet

February 13, 2006

FN9257.0

Synchronous Buck Pulse-Width

Modulator (PWM) Controller

The ISL8104 is a high performance synchronous controller

for demanding DC/DC converter applications. It provides

overcurrent fault protection and is designed to safely start-up

into prebiased output loads.

The output voltage of the converter can be precisely

regulated to as low as 0.597V, with a maximum tolerance of

鹵1% over the commercial temperature range, and 鹵1.5%

over the industrial temperature range.

The ISL8104 provides simple, single feedback loop, voltage-

mode control with fast transient response. It includes a

triangle-wave oscillator that is adjustable from below 50kHz

to over 1.5MHz. Full (0% to 100%) PWM duty cycle support

is provided.

The error amplifier features a 15MHz gain-bandwidth

product and 6V/碌s slew rate which enables high converter

bandwidth for fast transient performance.

The ISL8104's overcurrent protection monitors the current

by using the

r

DS(ON)

of the upper MOSFET which eliminates

the need for a current sensing resistor.

Features

鈥?Operates from an +8V 鹵5% to +14V 鹵10% Input

鈥?Excellent Output Voltage Regulation

- 0.597V Internal Reference

-

鹵1%

Over the Commercial Temperature Range

-

鹵1.5%

Over the Industrial Temperature Range

鈥?Simple Single-Loop Control Design

- Voltage-Mode PWM Control

鈥?Fast Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Ratio

- Leading and Falling Edge Modulation

鈥?Small Converter Size

- Constant Frequency Operation

- Oscillator Programmable from 50kHz to Over 1.5MHz

鈥?14V High Speed MOSFET Gate Drivers

- 2.0A Source/3A Sink at 14V Low Side Gate Drive

- 1.25A Source/2A Sink at 14V High Side Gate Drive

- Drives Two N-Channel MOSFETs

鈥?Overcurrent Fault Monitor

- High-Side MOSFET鈥檚 r

DS(ON)

Sensing

- Reduced ~120ns Blanking Time

鈥?Converter can Source and Sink Current

鈥?Soft-Start Done and an External Reference Pin for

Tracking Applications are Available in the QFN Package

鈥?Pin Compatible with ISL6522 and ISL6535

鈥?Supports Start-Up into Prebiased Loads

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

Pinouts

ISL8104

(14 LD NARROW SOIC AND 16 LD QFN)

TOP VIEW

RT 1

OCSET 2

SS 3

COMP 4

FB 5

EN 6

GND 7

14 VCC

13 PVCC

12 LGATE

11 PGND

10 BOOT

9 UGATE

8 PHASE

Applications

鈥?Test & Measurement Instruments

鈥?Routers Switches

鈥?Medical Instrumentation

鈥?Industrial Applications

鈥?Telecom/Datacom Applications

SSDONE

OCSET

RT

VCC

Ordering Information

PART #

(Note)

12

PVCC

11

LGATE

10

PGND

9

BOOT

16

SS

COMP

FB

EN

1

2

3

4

5

REFIN

15

14

13

PART

TEMP.

MARKING RANGE (擄C)

0 to 70

-40 to 85

0 to 70

-40 to 85

8104IBZ

8104IRZ

PACKAGE

(Pb-free)

14 Ld SOIC

14 Ld SOIC

PKG.

DWG. #

M14.15

M14.15

ISL8104CBZ 8104CBZ

ISL8104IBZ

ISL8104IRZ

ISL8104CRZ 8104CRZ

16 Ld 4x4 QFN L16.4x4

16 Ld 4x4 QFN L16.4x4

6

GND

7

PHASE

8

UGATE

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.

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 Intersil Americas Inc. 2006. All Rights Reserved

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

1

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