AP3428 Datasheet, PDF (1/13 Pages) Diodes Incorporated – 1.5MHZ, 1A STEP-DOWN DC-DC BUCK CONVERTER

AP3428/A
1.5MHZ, 1A STEP-DOWN DC-DC BUCK CONVERTER
Description
The AP3428/A 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 AP3428/A 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 AP3428/A 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 AP3428/A delivers 1A maximum output current while consuming
only 40μA of no-load quiescent current. Ultra-low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make the AP3428/A 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.
Pin Assignments
(Top View)
EN 1
5 FB
GND 2
LX 3
4 VIN
TSOT25 for AP3428
(Top View)
VIN 1
5 LX
GND 2
EN 3
4 FB
The AP3428/A is available in TSOT25, U-DFN2020-6 (Type J)
packages.
Features
 Output Current: Up to 1A
 Output Voltage: 0.6V to VIN
 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
 TSOT25, U-DFN2020-6 (Type J) Packages
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
TSOT25 for AP3428A
(Top View)
P in 1 Mark
NC 1
6 FB
EN 2
5 _GND
VIN 3
4 _LX
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.
AP3428/A
Document number: DS37417 Rev. 2 - 2
1 of 13
www.diodes.com
June 2016
© Diodes Incorporated