MP8619 – 8A, 25V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

MP8619 Rev. 0.9

www.MonolithicPower.com

4

12/10/2013

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PIN FUNCTIONS

Pin #

Name

Description

1—4

NC

No Connect.

5—8

BG

Low Side Gate Drive

9—15, 20,21,

30

GND

System Ground. This pin is the reference ground of the regulated output voltage.

For this reason care must be taken in PCB layout. Connect exposed pad to GND

plane for optimal thermal performance.

16—19

Exposed Pad

SW

Switch Output. Use wide PCB traces and multiple vias to make the connection.

22

VCC

Bias Supply. Decouple with 1µF capacitor.

23

BST

Bootstrap. A capacitor connected between SW and BS pins is required to form a

floating supply across the high-side switch driver.

24

FB

Feedback. An external resistor divider from the output to GND, tapped to the FB

pin, sets the output voltage.

25

PG

Power Good Output, the output of this pin is open drain. Power good threshold is

90% low to high and 70% high to low of regulation value. There is a 20μs delay to

pull PG if the output voltage is lower than 10% of regulation value.

26

EN/SYNC

EN=1 to enable the MP8619. External clock can be applied to EN pin for changing

switching frequency. For automatic start-up, connect EN pin to VIN with 100KΩ

resistor.

27—29

IN

Supply Voltage. The MP8619 operates from a +4.5V to +25V input rail. C1 is

needed to decouple the input rail. Use wide PCB traces and multiple vias to make

the connection.