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IC manufacturers Diodes Incorporated

Diodes Incorporated AP3401 | Demoboard AP3401 EV Board User Guide



TopologyBuck Converter
Input voltage2.5-5.5 V
Output 11.8 V
IC revision1.0


The AP3401 is a 1A step-down DC-DC converter. At heavy load, the constant-frequency PWM control performs excellent stability and transient response. No external compensation components are required.The AP3401 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage. The AP3401 employs internal powerswitch and synchronous rectifier to minimize external part count and realize highefficiency. During shutdown, the input is disconnected from the output and the shutdown current isless than 1μ A. Other key features include over-temperature and short circuit protection,and under-voltage lockout to prevent deep battery discharge.The AP3401 delivers 1A maximum output current while consuming only 40μ A of no-load quiescentcurrent. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3401an ideal choice for high output voltage, high current applications which require alow dropout threshold.The AP3401 is available in U-DFN2020-6 packages and TSOT23-6 packages.


  • Output Current: Up to 1A
  • Output Voltage: 0.6V to Vin
  • Input Voltage: 2.5V to 5.5V
  • 0.6V Reference Voltage With ±2% Precision
  • 40μ A (Typ) No Load Quiescent Current
  • Shutdown Current: <1μ A
  • 100% Duty Cycle Operation
  • 1.5MHz Switching Frequency
  • Internal Soft Start
  • No external Compensation Required
  • Current Limit Protection
  • Thermal Shutdown

Typical applications

  • Networking Equipment
  • TVs / Set-top-boxes
  • Notebook PCs