AP1603

STEP-UP DC/DC CONVERTER

AP1603

Document number: DS31131 Rev. 3 - 2

1 of 10

www.diodes.com

June 2010

© Diodes Incorporated

Description

The AP1603 is a high efficiency step-up DC/DC converter for

applications using as few as a single NiMH or Li-Ion battery

cells. Only four external components are required to deliver a

fixed output voltage of 3.3V. The AP1603 starts up from less

than 0.9V input with 1mA load. Pulse Frequency Modulation

scheme brings optimized performance for applications with

light output loading and low input voltages. The output ripple

and noise are lower compared with the circuits operating in

PSM mode.

The PFM control circuit operating in 150KHz (max.) switching

rate results in smaller passive components. The space saving

SOT26 packages make the AP1603 an ideal choice of DC/DC

converter for space conscious applications, like pagers,

electronic cameras, and wireless microphones.

Pin Assignments

1

2

3

74

6

LX

GND

OUT

REF

SOT26

AP1603

5

SHDN

FB

( Top View )

Features

•

A Guaranteed Start-Up from less than 0.9 V

•

High Efficiency

•

Low Quiescent Current

•

Less Number of External Components needed

•

Low Ripple and Low Noise

•

Space Saving Lead Free Package: SOT26

•

Lead Free Finish/ RoHS Compliant (Note 1)

Applications

•

Pagers

•

Cameras

•

Wireless Microphones

•

Pocket Organizers

•

Battery Backup Suppliers

•

Portable Instruments

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.