MP1471 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

MP1471 Rev. 1.01

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8

8/27/2013

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

GND

System Ground. Reference ground of the regulated output voltage: requires extra care

during PCB layout. Connect to GND with copper traces and vias.

2

SW

Switch Output. Connect using wide a PCB trace.

3

IN

Supply Voltage. The MP1471 operates from a 4.7V-to-16V input rail. Requires C1 to

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

4

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 drops below 140mV to prevent current-limit runaway during a short

circuit fault.

5

EN

resistor.

6

BST

Bootstrap. Connect a capacitor and a resistor between SW and BS pins to form a floating

supply across the high-side switch driver. Use a 1µF BST capacitor.