Diodes Incorporated

Demoboard AP65251WU-EVM

500kHz 16V 2A Synchronous DC/DC Buck Converter

Topology: Buck
Input Voltage (min.): 4.50 V
Input Voltage (max.): 16.00 V
Output 1: 1.20 V / 2.000 A

Original publication on 2017-03-24, revision 1 on


The AP65251 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TVs, set-top-boxes, and network systems. The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt ultra-low ESR ceramic capacitors.


  • VIN 4.5V to 16V
  • 2A Continuous Output Current, 2.5A Valley
  • Efficiency Up to 95%
  • Automated Light Load improvement
  • VOUT Adjustable to 0.6 to 6V
  • 500kHz Switching Frequency
  • Internal Soft-Start
  • Enable Pin
  • Over current Protection (OCP) with Hiccup
  • Thermal Protection
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)


  Order Code SPEC Product series L
Material Version Samples
744311220 PDF WE-HCI SMT Flat Wire High Current Inductor 2.2 9 1.75 13 11.4 52 Superflux SMT