AP3402

Document number: DS36623 Rev. 3 - 2

1 of 10

www.diodes.com

August 2015

© Diodes Incorporated

AP3402

1.0MHZ, 2A STEP-DOWN DC-DC BUCK CONVERTER

Description

The AP3402 is a 2A 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 AP3402 supports a range of input voltages from 2.7V 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 AP3402

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 1

μA. Other key features include over-temperature and short

circuit protection, and under-voltage lockout to prevent deep battery

discharge.

The AP3402 delivers 2A maximum output current while consuming

only 90

MOSFETs and 100% duty cycle operation make the AP3402 an ideal

choice for high output voltage, high current applications which require

a low dropout threshold.

The AP3402 is available in TSOT26 package.

Features



Output Current: Up to 2A





Input Voltage: 2.7V to 5.5V



Peak Efficiency Up to 95%



90

μA (Typ) No Load Quiescent Current



Shutdown Current: <1

μA



100% Duty Cycle Operation



1MHz Switching Frequency



Power Good Indicator Function



Internal Soft Start



No External Compensation Required



Current Limit Protection



Thermal Shutdown



TSOT26 Package



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



Halogen and Antimony Free.

“Green” Device (Note 3)

Pin Assignments

(Top View)

TSOT26

Applications



5V or 3.3V Point of Load Conversion



Telecom/Networking Equipment



Set Top Boxes



Storage Equipment



Video Cards



DDR Power Supply

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