XR

77103

7/28

REV1B

Pin Configuration

Pin Functions

Pin Number

Pin Name

Description

1

VOUT3

Buck 3 output sense pin.

2

COMP3

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

3

A0

4

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

5

GND

Ground.

6

VCC

Internal supply. Connect a ceramic capacitor from this pin to AGND. VCC tied to VIN for VIN = 5V

7

COMP1

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

8

VOUT1

Buck 1 output sense pin.

9

BST1

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

10

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

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

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

16

BST2

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

17

VOUT2

Buck 2 output sense pin.

18

COMP2

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

19

DGND

Digital ground.

20

nWR

Write protection input for NVM. The data can be written to NVM when this pin is low. This pin is internally

pulled high through 100kΩ pull up resistance.

NOTE:

1. VIN, VIN1, VIN2, and VIN3 must be tied together.

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

VOUT3

VL

PGOOD

GND

VOUT1

COMP1

A0

DGND

SCL

SDA

nWR

VOUT2

COMP2

VIN

VCC