MP2313 – 24V, 1A SYNC STEP DOWN CONVERTER

MP2313 Rev. 1.0

www.MonolithicPower.com

9

9/1/2014

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

AAM

A resistor is connected from AAM pin to ground to set a AAM voltage force MP2313 into

non-synchronous mode when load is small. Drive AAM pin high (=VCC) or float AAM pin

will force MP2313 into CCM.

2

IN

Supply Voltage. The MP2313 operates from a +4.5V to +24V input rail. C1 is needed to

decouple the input rail. Use wide PCB trace to make the connection.

3

SW

Switch Output. Use wide PCB trace to make the connection.

4

GND

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

For this reason care must be taken in PCB layout. Suggested to be connected to GND with

copper and vias.

5

BST

Bootstrap. A capacitor and a 20Ω resistor connected between SW and BST pins are

required to form a floating supply across the high-side switch driver.

6

EN

EN=1 to enable the MP2313.

7

VCC

Bias Supply. Decouple with 0.1μF-0.22μF cap. And the capacitance should be no more

than 0.22μF

8

FB

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

the output voltage. To prevent current limit run away during a short circuit fault condition

the frequency fold-back comparator lowers the oscillator frequency when the FB voltage is

below 400mV.