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Standard Application

Features

Range: 4.6V to 5.7V

SLTS106C

(Revised 6/21/2002)

Description

The PT4474 Excalibur™ DC/DC

converter module combines state-of-the-

art power conversion technology with

un-paralleled flexibility. Incorporating

high efficiency and ultra-fast transient

response, these modules provide up to

20A of output current over the program-

mable voltage range of 4.6V to 5.7V.

The modules include a number of

inbuilt features to facilitate system

integration. These include a foldback

output current limit, over-temperature

protection, and an inhibit on/off control.

A differential remote sense is also provided

to compensate for voltage drop between

the converter and load.

For additional output current, one

PT4474 may be operated with up to two

PT4494 compatible booster modules.

Each PT4494 adds an additional 20A of

output current capability.

UL 60950

CSA 22.2 950

VDE EN60950 Pending

L

O

A

D

PT4474

+V

sns

+V

out

-V

out

-V

sns

7

8-13

14-19

20

25

22

24

23

VID1 - VID4

+V

in

–V

in

1

2

3

Inhibit

C

1

+

PROGRAMMING PINS

+V

OUT

+V

IN

–V

IN

–V

OUT

C

o

+

C

2

• Programming pins, VID1–VID4, are shown

configured for Vo =5.0V

• For normal operation, pin 3 (Inhibit) must be

connected to –Vin.

Ordering Information

PT4474

o = 4.6 to 5.7 Volts

PT4494

o = 20-A Booster

Case/Pin

Order

Package

Configuration

Suffix

Code *

Vertical

N

(EKD)

Horizontal

A

(EKA)

SMD

C

(EKC)

* Previously known as package styles 1200,

1210, and 1215.

(Reference the applicable package code draw-

ing for the dimensions and PC board layout)

Pin-Out Information

Pin

Function

3

Inhibit

6

Do not connect

7

(+)Remote Sense

Pin

Function

14

15

16

17

18

19

20

(–)Remote Sense

21

Do not connect

22

VID1

23

VID2

24

VID3

25

VID4

26

DRV †

PT4474—24V

100-W 20-A Programmable

Isolated DC/DC Converter

† Pins 4, 5, & 26 are used for booster applications. For

stand-alone operation, leave open circuit.

• Shaded functions indicate those pins that are

referenced to primary-side potential.