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Standard Application

Features

Range: 1.3V to 3.5V

SLTS024C

(Revised 6/20/2002)

Description

The PT4481 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

30A of output current over the program-

mable voltage range of 1.3V to 3.5V.

This represents a full 100W output at

3.3V.

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 applications requiring power

supply redundancy, multiple PT4481

modules may connected for operation in

an ‘N+1’ configuration. Each PT4481

connected will share the load current with

other active PT4481 modules.

UL 60950

CSA 22.2 950

VDE EN60950 Pending

L

O

A

D

PT4481

+V

sns

+V

out

-V

out

-V

sns

7

8-13

14-19

20

25

22

24

23

VID0 - VID4

+V

in

–V

in

1

2

3

Inhibit

C

1

+

PROGRAMMING PINS

+V

OUT

+V

IN

–V

IN

–V

OUT

C

o

+

21

C

2

• Programming pins, VID0–VID4, are shown

configured for Vo =3.3V

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

connected to –Vin.

• For details on additional N+1 components

consult the related application note.

Ordering Information

PT4481

o = 1.3 to 3.5 Volts

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

4

Do not connect

5

Do not connect

6

Sync †

7

(+)Remote Sense

Pin

Function

14

15

16

17

19

20

(–)Remote Sense

21

VID0

22

VID1

23

VID2

24

VID3

25

VID4

26

Share †

PT4481—48V

100-W 30-A Programmable

Isolated DC/DC Converter

† Pins 6 & 26 are used for N+1 configuration (see

related application note). For stand-alone

operation, leave open circuit.

• Shaded functions indicate those pins that are

referenced to primary-side potential.