AP3403

Document number: DS36839 Rev. 3 - 2

1 of 9

www.diodes.com

May 2015

© Diodes Incorporated

AP3403

A Product Line of

Diodes Incorporated

600mA STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

Description

The AP3403 is a 2.0MHz fixed frequency, current mode, PWM

synchronous buck (step-down) DC-DC converter, capable of driving a

600mA load with high efficiency, excellent line and load regulation.

The high efficiency is easily configured by using an inductor, resistors

and capacitors as the external components. Current mode control

provides fast transient response and cycle-by-cycle current limit.

The AP3403 employs complete protection to ensure system security,

including input Under Voltage Lock Out, Over Temperature Protection

and hiccup mode Short Circuit Protection.

This IC is available in U-DFN1616-6 package.

Features



High Efficiency Buck Power Converter



Input Voltage Range: 2.3V to 5.5V



Output Voltage Range: 0.7V to 5.5V



Fixed 2.0MHz Oscillator Frequency



Built-in Soft-start Time



Built-in Over Current Protection



Built-in Thermal Shutdown Function



Built-in UVLO Function



Hiccup Mode SCP



Output Current: 600mA



Package: U-DFN1616-6



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

1

Pin 1 Mark

2

3

6

5

4

EP

EN

AGND

PGND

FB

VIN

SW

U-DFN1616-6 (Type G)

Applications



Post DC-DC Voltage Regulation



PDA and Notebook Computer

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

L 2.2

μH

4.7

μF

ON/OFF

VIN

EN

SW

FB

AGND

PGND

10

μF

R1

240K

Ω

R2

120K

Ω

22pF

AP3403

1

2

3

4

5

6