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IC manufacturers Diodes Incorporated

Diodes Incorporated AP3428 | Demoboard AP3428 EV Board User Guide



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


The AP3428 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 AP3428 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 AP3428 employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge.The AP3428 delivers 1A maximum output current while consuming only 40μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3428 an ideal choice for high output voltage, high current applications which require a low dropout threshold.The AP3428 is available in U-DFN2020-6 packages and TSOT23-5 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
  • 40μA (Typ) No Load Quiescent Current
  • Shutdown Current: <1μA
  • 100% Duty Cycle Operation
  • 1.5MHz Switching Frequency
  • Internal Soft Start
  • No external Compensation Required
  • Current Limit Protection
  • Thermal Shutdown

Typical applications

  • Notebook Computer / Pad
  • Post DC-DC Voltage Regulation
  • Set Top Boxes