MP2499M – 36V, 3A MAX, SYNCHRONOUS BUCK CONVERTER

MP2499M Rev 1.0

www.MonolithicPower.com

9

5/1/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2018 MPS. All Rights Reserved.

PIN FUNCTIONS

Package

Pin #

Name

Description

1, 2

IN

Supply voltage. The MP2499M operates from a 5V to 36V input rail. A capacitor

(C1) is required to decouple the input rail. Connect IN using a wide PCB trace.

3

NC

No connection. Do not connect.

4

ISENSE

Output current sense. Connect a resistor from ISENSE close to AGND to sense

the output current and set the continuous output current limit threshold.

5

EN/SYNC

Enable/synchronize. Drive EN/SYNC high to enable the MP2499M; drive

EN/SYNC low to disable the MP2499M. EN/SYNC cannot be floated. Apply an

external clock to EN/SYNC to change the switching frequency.

6

FB

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

GND to set the output voltage. The frequency foldback comparator lowers the

oscillator frequency when the FB voltage is below 240mV to prevent current limit

runaway during a short-circuit fault condition.

7

VCC

Bias supply. Decouple VCC with a 0.1

μF to 0.22μF capacitor. Select a capacitor

that does not exceed 0.22

μF.

8

AGND

Analog ground.

9

SW

Switch output. Connect SW using a wide PCB trace.

10

BST

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

floating supply across the high-side switch driver. A 20

Ω resistor placed between

the SW and BST capacitor is strongly recommended to reduce SW voltage spikes.

11, 12, 13

PGND

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

PGND required requires special care during PCB layout. For best results, connect

PGND with copper traces and vias.