Diodes Incorporated
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AP3403 (Obsolete)

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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.


  • 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
  • Halogen and Antimony Free. “Green” Device


  • Post DC-DC Voltage Regulation
  • PDA and Notebook Computer

Product Specifications

Product Parameters

Efficiency (%) 95
Frequency Typ (Hz) 2000
HS RDS(ON) (mΩ) 380
LS RDS(ON) (mΩ) 300
MaximumInput Voltage (V) 5.5
MinimumInput Voltage (V) 2.3
Output Current (mA) 0.6
Output Voltage (V) ADJ
Quiescent Current Typ (mA) 0.035
Shutdown Current Typ (µA) 5
Type Buck

Related Content


Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2380 2018-11-07 2019-05-07 Device End of Life (EOL)