AP3402 Datasheet, PDF (1/10 Pages) Diodes Incorporated – 1.0MHZ, 2A STEP-DOWN DC-DC BUCK CONVERTER

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 1μA. 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 90μA of no-load quiescent current. Ultra-low RDS(ON) integrated
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
 Output Voltage: 0.6V to VIN
 Input Voltage: 2.7V to 5.5V
 Peak Efficiency Up to 95%
 90μA (Typ) No Load Quiescent Current
 Shutdown Current: <1μA
 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)
Pin 1 Mark
EN 1
GND 2
LX 3
6 FB
5 PG
4 VIN
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.
AP3402
Document number: DS36623 Rev. 3 - 2
1 of 10
www.diodes.com
August 2015
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