Diodes Incorporated

Demoboard AP65550SP-EVM

650kHz, 18V, 5A, COT Synchronous DC/DC Buck Converter

Topologie: Buck
Eingangsspannung (min.): 4.50 V
Eingangsspannung (max.): 18.00 V
Ausgang 1: 1.05 V / 5.000 A

Erstveröffentlichung am 19.03.2018, Version 2.0 vom


The AP65550 is an adaptive on-time modesynchronous buck converter providing highefficiency, excellent transient response andhigh DC output accuracy for low-voltageregulation in digital TV and monitor.The constant-on-time control schemehandles wide input/output voltage ratios andprovides low external component count. Theinternal proprietary circuit enables thedevice to adopt both low equivalent seriesresistance (ESR) output capacitors, such asSP-CAP or POSCAP and ultra-low ESRceramic capacitors.The adaptive on-time control supportsseamless transition between continuousconduction mode (CCM) at higher loadconditions and discontinuous conductionmode (DCM) at lighter load conditions.DCM allows AP65550 maintain highefficiency at light load conditions. TheAP65550 also features programmable softstart,UVLO, OTP and OCP to protect thecircuit.This IC is available in SO-8EP package.


  • Fixed Frequency Emulated Constant On-Time Control
  • Good Stability Independent of the Output Capacitor ESR
  • Fast Load Transient Response
  • Synchronous Rectification: 65mΩ Internal High-Side Switch and 36mΩ Internal Low-Side Switch
  • Wide Input Voltage Range: 4.5V to 18V
  • Output Voltage Range: 0.765V to 6V
  • 5A Continuous Output Current
  • 650kHz Switching Frequency
  • Built-in Over Current Limit
  • Built-in Thermal Shutdown Protection
  • Programmable Soft-Start
  • Pre-Biased Start-Up


  Artikel Nr. SPEC Produktserie RDC
Material IR
Version C
Tol. C VR
(V (DC))
Keramiktyp H
Technische Artikelnummer Muster
744311150 PDF WE-HCI SMT-Hochstrominduktivität 6.6 1.5 Superflux 11 1.12 14 72 SMT
885012209028 PDF WCAP-CSGP MLCCs 1210 10 ±10% 25 5 X7R Klasse II 2 X7R1210106K025DFCT10000
885012207098 PDF WCAP-CSGP MLCCs 0805 100 ±10% 50 2.5 X7R Klasse II 0.8 X7R0805104K050DFCT10000
885012207051 PDF WCAP-CSGP MLCCs 0805 1 ±10% 16 5 X7R Klasse II 1.25 X7R0805105K016DFCT10000