MP8720 – 26V, 10A, SYNCHRONOUS BUCK CONVERTER WITH ADJUSTABLE CLM

MP8720 Rev. 1.01

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6

8/1/2017

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PIN FUNCTIONS

PIN #

Name

Description

1

VIN

Supply voltage. VIN supplies power for the internal MOSFET and regulator. The

MP8720 operates from a +4.5V to +26V input rail. An input capacitor is needed to

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

2, 4, 5, 6, 7

PGND

Power ground. Use wide PCB traces and multiple vias to make the connection.

3

3V3

External 3V3 VCC input for control and driver. Place a 1µF decoupling capacitor

close to 3V3 and PGND. It is recommended to form an R-C filter.

8, 16

NC

No connection. NC can either be connected to VIN, SW, or GND for easy layout.

9

SW

Switch output. Connect SW to the inductor and bootstrap capacitor. SW is connected

to VIN when the HS-FET is on. SW is connected to PGND when the LS-FET is on. Use

wide and short PCB traces to make the connection. SW is noisy, so keep sensitive

traces away from SW.

10

BST

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

supply across the high-side switch driver.

11

CLM

Current limit adjust. There are four settings for the current, which can be set by

connecting CLM to GND with different kinds of resistors.

12

PG

Power good output. PG is an open-drain signal. PG is high if the output voltage is

within a proper range.

13

FB

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

output voltage. Place the resistor divider as close to FB as possible. Avoid vias on the

FB traces.

14

MODE

Mode. Select MODE for different output ranges and to select DCM or CCM.

15

EN

Enable. When EN = 1, the regulator turns on; when EN = 0, the regulator turns off.