LP8728D-Q1

SNVSA72 – FEBRUARY 2015

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Pin Functions (continued)

PIN

DESCRIPTION

NUMBER

NAME

20

VIN_B4

P

Positive power supply input for Buck 4

21

EN_B4

D/I

Enable Buck 4

22

FB_B4

A

Feedback pin for Buck 4. Referenced against AGND.

23

PG_B4

D/O

Open-drain Power Good output for Buck 4

24

AGND

G

Analog ground

25

BYP

A

Internal 1.8-V supply voltage capacitor pin. A ceramic low-ESR 1-

μF capacitor should

be connected from this pin to AGND. The BYP voltage is generated internally, do not

supply or load this pin externally.

26

AVDD

P

27

PG_B1

D/O

Open-drain Power Good output for Buck 1

28

FB_B1

A

Feedback pin for Buck 1. Referenced against AGND.

Exposed die attachment pad should to be connected to GND plane with thermal vias

DAP

Die Attachment Pad

to improve the thermal performance of the system.

4

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