MP2225 –18V/5A SYNCHRONOUS STEP-DOWN CONVERTER

MP2225 Rev. 1.01

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10

4/13/2016

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PIN FUNCTIONS

Pin #

Name

Description

1

AGND

Analog Ground. Connect it to GND.

2

IN

Supply Voltage. The MP2225 operates from a 4.5V-to-18V input rail. Requires C1 to

decouple the input rail. Connect using a wide PCB trace.

3

SW

Switch Output. Connect using a wide PCB trace.

4

GND

Power Ground. Requires special consideration during PCB layout. Connect to GND with

copper traces and vias.

5

BST

Bootstrap. Requires a capacitor between SW and BST pins to form a floating supply across

the high-side switch driver.

6

EN/SYNC

EN high to enable the MP2225. Can apply an external clock to the EN pin to change the

switching frequency.

7

VCC

Bias Supply. Decouple with a 0.1μF-to-0.22μF capacitor.

8

FB

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

the output voltage. The frequency fold-back comparator lowers the oscillator frequency

when the FB voltage is below 480mV to prevent current-limit run-away during a short-circuit

fault condition.