Diodes AP3418 User Manual
Ap3418, Description, Features
AP3418
Document number: DS37233 Rev.
2 - 2
1 of 11
April 2014
© Diodes Incorporated
AP3418
A Product Line of
Diodes Incorporated
1.5A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
Description
The AP3418 is a 1.4MHz fixed frequency, current mode, PWM
synchronous buck (step-down) DC-DC converter, capable of driving a
1.5A load with high efficiency, excellent line and load regulation. The
device integrates synchronous P-channel and N-channel power
MOSFET switches with low on-resistance. It is ideal for powering
portable equipment that runs from a single Li-ion battery.
A standard series of inductors are available from several different
manufacturers optimized for use with the AP3418. This feature greatly
simplifies the design of switch-mode power supplies.
The AP3418 is available in SOT25 package.
Features
Input Voltage Range: 2.5V to 5.5V
Output Voltage: 0.6V to V
IN
ADJ Output
Fixed 1.4MHz Frequency
High Efficiency up to 95%
Output Current: 1.5A
Current Mode Control
100% Duty Cycle in Dropout
Built-in Over Current Protection
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
Built-in UVLO Function
Built-in Soft-start
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
SOT25
Applications
LCD TV
Set-top Box
Datacom
Portable Device
Smart Phone
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
r 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
AP3418-ADJ
L
C
OUT
C
IN
V
IN
R2
R1
V
OUT
4.7
F
2.2
H
22
F
EN
VIN
SW
FB
GND
1
4
3
2
5
1
2
3
4
5
EN
GND
SW
FB
VIN