Diodes Incorporated
U QFN4040 16 SWP

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

Back to Buck Converter


3.8V to 60V Input, 2A Low IQ Synchronous Buck Converter

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The DIODES™ AP66200 is an adjustable switching frequency, internally compensated, synchronous DC-DC buck converter with a default internal frequency of 500kHz. The device fully integrates a 185mΩ high-side power MOSFET and an 80mΩ low-side power MOSFET to provide highly efficient step-down DC-DC conversion.

The AP66200 enables a continuous load current of up to 2A with as high as 95% efficiency in enhanced bias. It features current mode control operation, which enables easy loop stabilization while supporting a wide range of output capacitive loads. 

With its high level of integration and minimal need for external components, the AP66200 simplifies board layout and reduces space requirements. This makes it ideal for distributed power architectures. 

The AP66200 is available in the standard Green U-QFN4040-16/SWP (Type UXB) package.


  • VIN8 to 60V
  • 2A Continuous Output Current
  • VOUT Adjustable from 0.8V to 50V
  • Enhanced Efficiency Mode with Bias
  • Adjustable Switching Frequency. 500kHz Default Frequency
  • Start-up with Pre-biased Output
  • External Soft-Start with Tracking – Sequential, Ratiometric, or Absolute. Default Internal Soft-Start of 2ms
  • Enable Pin with 5% tolerance
  • Soft Discharge
  • ±5% Power Good Detection with Internal Pull-up Resistor
  • Overcurrent Protection (OCP) with Hiccup
  • Thermal Protection
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • An automotive-compliant part is available under separate datasheet DIODES™ (AP66200Q)


  • General-purpose point-of-load DC/DC power conversion
  • Telecommunication systems
  • Distributed Power supplies
  • Home Audio devices
  • Consumer electronics
  • Network supplies
  • FPGA, DSP, and ASIC supplies
  • Green electronics

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 3.8
Maximum Input Voltage (V) 60
Output Current (A) 2
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) 50
Quiescent Current Typ (µA) 40
Shutdown Current Typ (µA) 1.5
Frequency Typ (kHz) 300/500/2500
HS RDS(ON) (mΩ) 185
LS RDS(ON) (mΩ) 80
Features Enhanced Efficiency Mode with Bias, Adjustable Switching Frequency, 500kHz Default Frequency, Start-up with Pre-biased Output, External Soft-Start with Tracking – Sequential, Ratiometric, or Absolute. Default Internal Soft-Start of 1.7ms, Enable Pin with 5

Related Content


Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques