PPMIC BU

www.belling.com.cn

BL3406B Rev 1.5

Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited

10/2009

©2009 Belling All Rights Reserved

3

BL3406B

1.5 MHz, 800mA Synchronous Buck Converter

Pin Description

PIN

NAME

FUNCTION

1

RUN

Regulator Enable Control Input. Drive RUN above 1.5V to turn on the part.

Drive RUN below 0.3V to turn it off. In shutdown, all functions are disabled

drawing <1µA supply current. Do not leave RUN floating.

2

GND

Ground

3

SW

Power Switch Output. It is the switch node connection to external inductor. This

pin connects to the drains of the internal P-Channel and N-Channel MOSFET

switches.

4

Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 2.2µF or

greater ceramic capacitor.

5

external resistor divider. The regulated voltage on this pin is 0.6V.

An internal resistive divider divides the output voltage down for comparison to the

internal reference voltage.

Block Diagram