600mA Step-down DC/DC Converter with Synchronous Rectifier
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 1 Mark
This IC is available in U-DFN2020-8 package.
U-DFN2020-8 (Type E)
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)
Post DC-DC Voltage Regulation
Mobile Phones and Wearable Devices
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"
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
AP3405 FB 7
Document number: DS38093 Rev. 1 - 2
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