XR

6/19

REV1A

Pin Configuration

Pin Functions

Pin Number

Pin Name

Description

1

VFB3

Buck 3 feedback pin.

2

COMP3

Compensation pin for Buck 3. Connect a series RC circuit to this pin for compensation.

3

NC

No connect.

4

VIN

IC supply pin. Connect a capacitor as close as possible to this pin.

5

GND

Ground.

6

VCC

Internal supply. Connect a ceramic capacitor from this pin to ground.

7

COMP1

Compensation pin for Buck 1. Connect a series RC circuit to this pin for compensation.

8

VFB1

Buck 1 feedback pin.

9

BST1

Bootstrap capacitor for Buck 1. Connect a bootstrap capacitor from this pin to LX1.

10

VIN1

Input supply for Buck 1. Connect a capacitor as close as possible to this pin.

11

LX1

Switching node for Buck 1.

12

LX1

Switching node for Buck 1.

13

LX2

Switching node for Buck 2.

14

LX2

Switching node for Buck 2.

15

VIN2

Input supply for Buck 2. Connect a capacitor as close as possible to this pin.

16

BST2

Bootstrap capacitor for Buck 2. Connect a bootstrap capacitor from this pin to LX2.

17

VFB2

Buck 2 feedback pin.

18

COMP2

Compensation pin for Buck 2. Connect a series RC circuit to this pin for compensation.

19

DGND

Digital ground.

20

NC

No connect.

COMP3

1

2

3

4

5

6

7

8

32

31

30

29

28

27

26

25

9

10

11

12

13

14

15

16

24

23

22

21

20

19

18

17

VFB3

NC

PGOOD

GND

VFB1

COMP1

NC

DGND

NC

NC

NC

VFB2

COMP2

VIN

VCC