AP3401

Document number: DS37389 Rev. 2 - 2

1 of 11

www.diodes.com

June 2016

© Diodes Incorporated

AP3401

1.5MHZ, 1A STEP-DOWN DC - DC BUCK CONVERTER

Description

The AP3401 is a 1A step-down DC-DC converter. At heavy load, the

constant-frequency PWM control performs excellent stability and

transient response. No external compensation components are

required.

The AP3401 supports a range of input voltages from 2.5V to 5.5V,

allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH

cell, and other standard power sources. The output voltage is

adjustable from 0.6V to the input voltage. The AP3401 employs

internal power switch and synchronous rectifier to minimize external

part count and realize high efficiency. During shutdown, the input is

disconnected from the output and the shutdown current is less than

1μA. Other key features include over-temperature and short circuit

protection, and under-voltage lockout to prevent deep battery

discharge.

The AP3401 delivers 1A maximum output current while consuming

MOSFETs and 100% duty cycle operation make the AP3401 an ideal

choice for high output voltage, high current applications which require

a low dropout threshold. Pulse skip mode allows to maintain high

efficiency at light-load conditions.

The AP3401 is available in TSOT26, U-DFN2020-6 (Type J)

packages.

Features



Output Current: Up to 1A





Input Voltage: 2.5V to 5.5V



0.6V Reference Voltage With ±2% Precision



40µA (Typ) No Load Quiescent Current



Shutdown Current: <1µA



100% Duty Cycle Operation



1.5MHz Switching Frequency



Internal Soft Start



No External Compensation Required



Current Limit Protection



Thermal Shutdown



TSOT26, U-DFN2020-6 (Type J) Packages



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



Halogen a

nd Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

TSOT26

(Top View)

U-DFN2020-6 (Type J)

Applications



Post DC-DC Voltage Regulation



Set Top Boxes



Notebook Computer



PAD

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.

EN

LX

VIN

FB

GND

PG

1

2

3

4

5

Pin 1 Mark

6

EN

PG

VIN

FB

GND

LX

P in 1 Mark

1

2

3

4

5

6