MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER

MP1492 Rev. 1.1

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4

3/13/2012

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PIN FUNCTIONS

SOIC8

Pin #

Name

Description

1

IN

Supply Voltage. The MP1492 operates from a +4.2V to +16V input rail. C1 is needed to

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

2

GND

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

reason care must be taken in PCB layout.

3

SW

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

4

BST

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

supply across the high-side switch driver.

5

BYP

Internal LDO output. Decouple with a 1µF ceramic capacitor. X7R or X5R grade dielectric

ceramic capacitors are recommended for their stable temperature characteristics.

6

EN

EN=1 to enable the MP1492. For automatic start-up, connect EN pin to VIN with a pull-up

resistor.

7

FB

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

the output voltage.

8

FREQ

Frequency. Setting Pin. Sets the full-load switching frequency driving CCM operation..

capacitor can be added to improve any switching frequency jitter that may be present.