1

®

FN9030.8

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

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ISL6522

Buck and Synchronous Rectifier

Pulse-Width Modulator (PWM) Controller

The ISL6522 provides complete control and protection for a

DC-DC converter optimized for high-performance micro-

processor applications. It is designed to drive two N-Channel

MOSFETs in a synchronous rectified buck topology. The

ISL6522 integrates all of the control, output adjustment,

monitoring and protection functions into a single package.

The output voltage of the converter can be precisely

regulated to as low as 0.8V, with a maximum tolerance of

±1% over temperature and line voltage variations.

The ISL6522 provides simple, single feedback loop, voltage-

mode control with fast transient response. It includes a

200kHz free-running triangle-wave oscillator that is

adjustable from below 50kHz to over 1MHz. The error

amplifier features a 15MHz gain-bandwidth product and

6V/

µs slew rate which enables high converter bandwidth for

fast transient performance. The resulting PWM duty ratio

ranges from 0–100%.

The ISL6522 protects against overcurrent conditions by

inhibiting PWM operation. The ISL6522 monitors the current

the need for a current sensing resistor.

Pinouts

SOIC, TSSOP

TOP VIEW

QFN

TOP VIEW

Features

• Drives two N-Channel MOSFETs

• Operates from +5V or +12V input

• Simple single-loop control design

- Voltage-mode PWM control

• Fast transient response

- High-bandwidth error amplifier

- Full 0–100% duty ratio

• Excellent output voltage regulation

- 0.8V internal reference

-

±1% over line voltage and temperature

• Overcurrent fault monitor

- Does not require extra current sensing element

• Converter can source and sink current

• Small converter size

- Constant frequency operation

- 200kHz free-running oscillator programmable from

50kHz to over 1MHz

• 14-lead SOIC and TSSOP package and 16-lead 5x5mm

QFN Package

• QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat

No Leads-Product Outline.

- Near Chip-Scale Package Footprint; Improves PCB

Efficiency and Thinner in Profile

• Pb-free plus anneal available (RoHS compliant)

Applications

AlphaPC™ microprocessors

• High-power 5V to 3.xV DC-DC regulators

• Low-voltage distributed power supplies

8

9

10

11

12

13

14

7

6

5

4

3

2

1

OCSET

SS

EN

COMP

FB

RT

VCC

LGATE

PGND

BOOT

UGATE

PHASE

GND

PVCC

1

3

4

15

SS

COMP

FB

EN

16

14

13

2

12

10

9

11

6

57

8

PVCC

LGATE

PGND

BOOT

GND

Data Sheet

March 10, 2006

FOR

NEW

DES

IGN

S, IN

TER

SIL

REC

OMM

END

S

DRO

P-IN

ENH

ANC

ED P

ROD

UCT

- ISL

6535