Si9139

Vishay Siliconix

New Product

www.vishay.com

4

Document Number: 71841

S-22317—Rev. A, 16-Dec-02

PIN CONFIGURATION

RESET

SSOP-28

CSP

Top View

25

26

27

28

2

3

4

1

22

23

24

5

6

7

CSN

COMP

PGND

GND

REF

18

19

20

21

9

10

11

8

15

16

17

12

13

14

PIN DESCRIPTION

Pin

Symbol

Description

1

RESET

cycle delay following proper power-up of all supply outputs indicating Power_Good.

2

Feedback for Auxiliary controller C. Normally connected to an external resistor divider used to set the Auxiliary output

voltage.

3

Boost capacitor connection for Auxiliary SMPS controller C

4

Gate-drive output for Auxiliary SMPS controller C high-side MOSFET

5

Inductor connection for Auxiliary SMPS controller C

6

Gate-drive output for Auxiliary SMPS controller C low-side MOSFET

7

CSP

Current sense positive input for Auxiliary SMPS controller C

8

CSN

Current sense negative input for Auxiliary SMPS controller C

9

COMP

Auxiliary SMPS controller C compensation connection, if required

10

GND

Analog ground

11

REF

3.3-V internal reference

12

Logic High enables the SMPS controller A

13

Logic High enables the SMPS controller B and the Auxiliary SMPS controller C adjustable SMPS controllers

14

Current sense input for SMPS controller B

15

Gate-drive output for SMPS controller B high-side MOSFET

16

Inductor connection for SMPS controller B

17

Boost capacitor connection for SMPS controller B

18

Gate-drive output for SMPS controller B low-side MOSFET

19

PGND

Power ground

20

Feedback for SMPS controller B

21

5-V logic supply voltage for internal circuitry

22

Input voltage

23

Gate-drive output for SMPS controller A low-side MOSFET

24

Boost capacitor connection for SMPS controller A

25

Gate-drive output for SMPS controller A high-side MOSFET

26

Inductor connection for SMPS controller A low-side MOSFET

27

Feedback for SMPS controller A

28

Current sense input for SMPS controller A