AP3405 Datasheet, PDF (1/9 Pages) Diodes Incorporated – 600mA Step-down DC/DC Converter with Synchronous Rectifier

AP3405
600mA Step-down DC/DC Converter with Synchronous Rectifier
Description
The AP3405 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 AP3405 employs complete protection to ensure system security,
including input Undervoltage Lockout, Over-Temperature Protection
and hiccup mode Short Circuit Protection.
Pin Assignments
(Top View)
Pin 1 Mark
NC 1
NC ²
EP
AGND 3
This IC is available in U-DFN2020-8 package.
PGND 4
8 EN
7 ^FB
6 VIN
5 SW
U-DFN2020-8 (Type E)
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 Overcurrent Protection
 Built-in Thermal Shutdown Function
 Built-in UVLO Function
 Hiccup Mode SCP
 Output Current: 600mA
 Package: U-DFN2020-8 (Type E)
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Applications
 Post DC-DC Voltage Regulation
 Mobile Phones and Wearable Devices
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
6
VIN
5
SW
AP3405 ^{FB 7}
8 _EN
AGND ³
PGND ⁴
R1
240KΩ
R2
120KΩ
V_OUT 1.8V
C_ff
22pF
C_OUT
10μF
AP3405
Document number: DS38093 Rev. 1 - 2
1 of 9
www.diodes.com
January 2016
© Diodes Incorporated