1

DAP

PIN 1 ID

2

3

4

5

6

7

21

20

19

18

17

16

15

8

9

10

11

12

13

14

28

27

26

25

24

23

22

FB_B1

PG_B4

PG_B2

EN_B2

PG_B1

FB_B4

FB_B2

DEFSEL

AVDD

BYP

AGND

FB_B3

EN_B3

PG_B3

TOP VIEW

LP8728B-Q1

www.ti.com

SNVSA70 – FEBRUARY 2015

5 Pin Configuration and Functions

WQFN (RSG) Package

28 Pins

Pin Functions

PIN

TYPE(1)

DESCRIPTION

NUMBER

NAME

1

EN_B1

D/I

Enable Buck 1

2

VIN_B1

P

Positive power supply input for Buck 1

3

SW_B1

P

Switch node for Buck 1

4

GND_B1

G

Power ground for Buck 1

5

GND_B2

G

Power ground for Buck 2

6

SW_B2

P

Switch node for Buck 2

7

VIN_B2

P

Positive power supply input for Buck 2

8

FB_B2

A

Feedback pin for Buck 2. Referenced against AGND.

9

EN_B2

D/I

Enable Buck 2

10

PG_B2

D/O

Open-drain Power Good output for Buck 2

11

DEFSEL

D/I

Buck 3 output voltage selection pin

12

PG_B3

D/O

Open-drain Power Good output for Buck 3

13

EN_B3

D/I

Enable Buck 3

14

FB_B3

A

Feedback pin for Buck 3. Referenced against AGND.

15

VIN_B3

P

Positive power supply input for Buck 3

16

SW_B3

P

Switch node for Buck 3

17

GND_B3

G

Power ground for Buck 3

18

GND_B4

G

Power ground for Buck 4

19

SW_B4

P

Switch node for Buck 4

(1)

A: Analog Pin, G: Ground Pin, P: Power Pin, O: Output Pin, D/I: Digital Input, D/O: Digital Output.

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