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Diodes Pericom: A product line of Diodes Incorporated


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.


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


  • 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

Product Specifications

Product Parameters

Type Buck
Efficiency 95 %
HS RDS(ON) 380 mΩ
LS RDS(ON) 300 mΩ
Frequency Typ 2000 kHz
Minimum Input Voltage 2.3 V
Maximum Input Voltage 5.5 V
Output Current 0.6 A
Output Voltage ADJ V
Quiescent Current Typ 0.035 mA
Shutdown Current Typ 5 µA

Related Content

U-DFN1616-6 (Type G)

Quality & Reliability

Technical Documents

Recommended Soldering Techniques
Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3403FLJ-7 Digi-Key Electronics 2755 7/22/2019 Buy Now Americas


Product Change Notices

PCN # Issue Date Subject
PCN_2380 2018-07-11 Device End of Life (EOL)