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Features

Description

The PT7742 is a 20 Amp “Current

Booster” for the PT7708 housed in the

same 27-pin SIP package.

Multiple PT7742 boosters will

operate in parallel with one PT7708

product, boosting output current in

increments of 20A. Combinations of a

PT7708 regulator and PT7742 current

boosters can supply power for virtually

any multiple mega-processor applica-

tion.

A PT7742 current booster adds a

parallel output stage that is driven di-

rectly by the regulator. This allows

the system to run in perfect synchron-

ization to provide a low noise solution.

The PT7742 only operates in com-

bination with a PT7708 series regulator,

and is not a stand-alone product. Please

refer to the PT7708 data sheet for the

performance specifications.

The booster uses the same 27-pin

case and has the same package options

as its companion regulator.

PT7742—3.3V

20 Amp “Current Booster” for PT7708

Integrated Switching Regulator

Ordering Information

PT7742

J

3.1V to 3.6V

60 Amps

Standard Application

(For dimensions and PC Board layout, see

Package Styles 800 and 810.)

Pin-Out Information

Pin Function

1

Do not connect

2

Do not connect

3

Do not connect

4

Do not connect

5

Do not connect

6

Do not connect

10

11

12

Do not connect

13

GND

Pin Function

14

GND

15

GND

16

GND

17

GND

18

GND

19

GND

20

21

22

23

24

25

26

Do not connect

27

Master Sync In

C

IN

+

C

OUT

+

LOAD

V

IN

VID0

VID1

VID2

VID3

V

OUT

GND

GND

STBY*

L1

1H

REMOTE SENSE ( )

REMOTE SENSE (+)

PROGRAMMING PINS

C

IN

+

L1

1H

PT7742

20-25

13-19

27

7-11

Vo

Vin

GND

Synch

In

PT7708

43

21

2 6

20-25

12

5

13-19

27

7-11

Vo

Vin

GND

SNS(+)

SNS(-)

Synch

Out

STBY

VID3 - VID0

C

OUT

+

PT Series Suffix

Case/Pin

Configuration

Vertical Through-Hole

N

Horizontal Through-Hole

A

Horizontal Surface Mount

C

External Capacitors: The PT7742 requires a minimum ouput capacitance of 330µF for proper operation. The PT7742 also requires an input capacitance of

1500µF, which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications additional capacitance may be required.

For more information refer to the application note regarding capacitor selection for this product.

Input Filter:

An input filter inductor is optional for most applications. The inductor must be sized to handle 20ADC with a typical value of 1µH.

SLTS085

(Revised 6/30/2000)