MP8712 – 18V, 12A, SYNCHRONOUS STEP-DOWN CONVERTER

MP8712 Rev. 1.2

MonolithicPower.com

13

3/19/2021

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PIN FUNCTIONS

QFN-14

Pin#

Name

Description

1

BST

Bootstrap. A capacitor is required between SW and BST to form a floating supply across

the high-side switch driver.

2

SW

Switch output. Connect using a wide PCB trace.

3, 4, 6

NC

No connection. Leave NC floating.

5

EN

Enable. Drive EN high to enable the MP8712. EN has a 1.5MΩ internal pull-down resistor

to GND. EN is a high-voltage pin and can be connected to VIN directly for auto start-up.

7

PG

Power good indication. PG is an open-drain structure. PG is de-asserted if the output

voltage is out of the regulation window.

8

PGND

System power ground. PGND is the reference ground of the regulated output voltage.

PGND requires special consideration during the PCB layout. Connect PGND to the

ground plane with copper traces and vias.

9

VIN

Supply voltage. The MP8712 operates from a 3V to 18V input rail. VIN requires a

ceramic capacitor to decouple the input rail. Connect VIN using a wide PCB trace.

10

VOUT

Output voltage sense. Connect VOUT to the positive terminal of the load.

11

FB

Feedback. Connect FB to the tap of an external resistor divider from the output to GND to

set the output voltage.

12

SS

Soft start set-up. Connect a capacitor from SS to ground to set the soft-start time.

13

VCC

Internal LDO regulator output. Decouple VCC with a 0.47µF capacitor.

14

AGND

Signal ground. AGND is not connected to PGND internally. Ensure that AGND is

connected to PGND in the PCB layout.