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Standard Application

Features

(See Ordering Information)

Description

The PT6940 Excalibur™ power modules

are a series of high-efficiency dual-output

regulators, housed in a solderable space-

saving package. The dual output is ideal

for DSP applications that require a second

voltage source for a processor core.

Both outputs from the PT6940 regulator

modules are rated to deliver a full 6A load

current simultaneously, and are internally

sequenced to comply with the power-up

requirements of popular DSP ICs.

Each output can be independently

adjusted with a single external resistor, and

incorporates an output sense to compensate

for voltage drop between the regulator and

load. A short-circuit load fault at either

output will result in the coordinated

shutdown of both voltages.

(coordinated shutdown)

*300µF for Oscon® or low ESR tantalum

(see application notes)

PT6940 Series

6-A Dual Output 5-V/3.3-V Input

Integrated Switching Regulator

SLTS155B

Revised (4/8/2002)

Ordering Information

PT6941

o = +3.3/2.5 Volts

PT6942

o = +3.3/1.8 Volts

PT6943

o = +3.3/1.5 Volts

PT6944

o = +3.3/1.2 Volts

† PT6946

o = +2.5/1.8 Volts

† PT6947

o = +2.5/1.5 Volts

† PT6948

o = +2.5/1.2 Volts

† -Denotes models that will also operate off

3.3V input bus.

Pin Function

1

STBY* †

7GND

8GND

9GND

10

GND

11

GND

12

GND

13

14

Pin

Function

15

16

17

GND

18

GND

19

GND

20

GND

21

GND

22

GND

23

24

25

26

27

† STBY* pin:

Open = Outputs enabled

Ground = Outputs disabled

Pin-Out Information

Case/Pin

Order

Package

Configuration

Suffix

Code

Vertical

N

(ENE)

Horizontal

A

(ENF)

SMD

C

(ENG)

(Reference the applicable package code drawing

for the dimensions and PC layout)

PT6940

Co

1

330µF

+

13–16

4–6

23–25

C

IN

330µF

26

Co

2

330µF

+

3

1

Vo

1

Vo

2

L

O

A

D

L

O

A

D

Vo

Vo

V

IN

STBY*

GND

GND

+

7–12

17–22

Not Recommended For New Designs