AP3403 Datasheet, PDF (1/9 Pages) Diodes Incorporated – 600mA STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

A Product Line of
Diodes Incorporated
AP3403
600mA STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
Description
The AP3403 is a 2.0MHz fixed frequency, current mode, PWM
synchronous buck (step-down) DC-DC converter, capable of driving a
600mA load with high efficiency, excellent line and load regulation.
The high efficiency is easily configured by using an inductor, resistors
and capacitors as the external components. Current mode control
provides fast transient response and cycle-by-cycle current limit.
The AP3403 employs complete protection to ensure system security,
including input Under Voltage Lock Out, Over Temperature Protection
and hiccup mode Short Circuit Protection.
This IC is available in U-DFN1616-6 package.
Pin Assignments
(Top View)
Pin 1 Mark
EN 1
AGND 2
EP
6 FB
5 VIN
Features
 High Efficiency Buck Power Converter
 Input Voltage Range: 2.3V to 5.5V
 Output Voltage Range: 0.7V to 5.5V
 Fixed 2.0MHz Oscillator Frequency
 Built-in Soft-start Time
 Built-in Over Current Protection
 Built-in Thermal Shutdown Function
 Built-in UVLO Function
 Hiccup Mode SCP
 Output Current: 600mA
 Package: U-DFN1616-6
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
PGND 3
4 SW
U-DFN1616-6 (Type G)
Applications
 Post DC-DC Voltage Regulation
 PDA and Notebook Computer
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.
Typical Applications Circuit
V_IN
C_IN
4.7μF
ON/OFF
L 2.2μH
5
VIN
4
SW
AP3403 ^{FB 6}
1 _EN
AGND ²
PGND ³
R1
240KΩ
R2
120KΩ
V_OUT 1.8V
C_ff
22pF
C_OUT
10μF
AP3403
Document number: DS36839 Rev. 3 - 2
1 of 9
www.diodes.com
May 2015
© Diodes Incorporated