EL7584

FN7317 Rev 2.00

Page 4 of 16

February 4, 2005

PIN NUMBER

PIN NAME

PIN TYPE

PIN FUNCTION

1

SS

I

Soft-Start input: a capacitor determines the current limit ramp time.

2

FBB

I

3

EN

I

(See Applications Information) ; active HIGH input.

4

VDDB

P

5

LX1

O

Boost inductor saturating MOSFET #1.

6

LX2

O

Boost inductor saturating MOSFET #2.

7

VSSN*

P

8

DRVN

O

9

VDDN

P

10

FBN

I

11

DP

I

12

INC

I

13

VDDC

P

14

VCOM

O

15

VSSC*

P

16

FBP

I

17

VDDP

P

18

DRVP

O

19

VSSP*

P

20

PGND*

P

Ground return for MOSFET #1.

21

PGND*

P

Ground return for MOSFET #2.

22

VREF

O

23

ROSC

I

An external resistor sets the DC/DC switching frequency.

24

VSSB*

P

NOTE: *VSSB, VSSC, VSSN, VSSP, and PGND (2) are shorted internally to the device substrate.