1

®

EL7563

Monolithic 4 Amp DC/DC Step-Down

Regulator

The EL7563 is an integrated, full-featured synchronous step-

down regulator with output voltage adjustable from 1.0V to

2.5V. It is capable of delivering 4A continuous current at up

to 95% efficiency. The EL7563 operates at a constant

frequency pulse width modulation (PWM) mode, making

external synchronization possible. Patented on-chip

resistorless current sensing enables current mode control,

which provides cycle-by-cycle current limiting, over-current

protection, and excellent step load response. The EL7563

features power tracking, which makes the start-up

sequencing of multiple converters possible. A junction

temperature indicator conveniently monitors the silicon die

temperature, saving the designer time on the tedious

thermal characterization. The minimal external components

and full functionality make this EL7563 ideal for desktop and

portable applications.

The EL7563 is offered in 20-pin SO and 28-pin HTSSOP

packages.

Pinout

EL7563

(20-PIN SO)

TOP VIEW

Features

• Integrated synchronous MOSFETs and current mode

controller

• 4A continuous output current

• Up to 95% efficiency

• Internal patented current sense

• Cycle-by-cycle current limit

• 3V to 3.6V input voltage

• Adjustable output voltage 1V to 2.5V

• Precision reference

• ±0.5% load and line regulation

• Adjustable switching frequency to 1MHz

• Oscillator synchronization possible

• Internal soft-start

• Over-voltage protection

• Junction temperature indicator

• Over-temperature protection

• Under-voltage lockout

• Multiple supply start-up tracking

• Power-good indicator

• 20-pin SO (0.300”) package

• 28-pin HTSSOP package

• Pb-Free available (RoHS compliant)

Applications

• DSP, CPU core, and I/O supplies

• Logic/Bus supplies

• Portable equipment

• DC/DC converter modules

• GTL + Bus power supply

Manufactured Under U.S. Patent No. 5,7323,974

Typical Application Diagrams continued on page 3

1

2

3

4

16

15

14

13

5

6

7

12

11

9

8

10

20

19

18

17

VREF

SGND

COSC

VDD

VTJ

PGND

PGND

VIN

STP

STN

EN

FB

PG

VDRV

VHI

LX

LX

PGND

PGND

PGND

0.1µF

390pF

2.2nF

0.22µF

330µF

22

Ω

0.22µF

4.7µH

330µF

1.58k

Ω

1k

Ω

3.3V

0.1µF

0.22µF

2.2nF

2.5V

4A

C5

C4

C2

C3

R4

C1

C7

R1

R2

C10

L1

C6

C9

D1

D3

D4

C8

D2

Data Sheet

May 13, 2005

FN7296.2

NOT

REC

OMM

END

ED F

OR

NEW

DES

IGN

S

SEE

EL7

554

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

1-888-INTERSIL or 1-888-352-6832

Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved

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