Diodes Incorporated

Demoboard AP64351SP-EVM

40V, 3.5A, Synchronous DC/DC Buck Converter with Programmable Soft-Start

Topologie: Buck
Eingangsspannung (min.): 3.80 V
Eingangsspannung (max.): 40.00 V
Ausgang 1: 12.00 V / 3.500 A

Erstveröffentlichung am 24.10.2019, Version 1-0 vom


The AP64351 is 3.5A synchronous buck converters with wide input voltage, ranging from 3.8V to 40V, which integrates an 80mΩ high-side MOSFET and a 50mΩ low-side MOSFET. The AP64351, adopting the peak current mode control, supports the Pulse Skipping Modulation (PSM) with typical 25uA low quiescent current which assists the converter on achieving high efficiency at light load or standby condition.The AP64351 features programmable soft-start time with 570kHz switching frequency. The converter allows power conversion from high input voltage to low output voltage with a minimum 100ns on-time of high-side MOSFET. It also supports Low Drop-Out LDO operation at low voltage difference from input to output condition.The AP64351 is an Electromagnetic Interference (EMI) friendly buck converter with implementing optimized design for EMI reduction. The AP64351 features Frequency Spread Spectrum FSS with ±6% jittering span of the 570kHz switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted EMI.The AP64351 offers cycle-by-cycle current limit and hiccup over current protection, thermal shutdown protection, output over-voltage protection and input voltage under-voltage protection. The device is available in an 8-pin thermally enhanced SOP-8 package.


  • Wide Input Range: 3.8V-40V
  • Up to 3.5A Continuous Output Current
  • 0.8V ±1% Feedback Reference Voltage
  • Integrated 80mΩ High-Side and 50mΩ Low-Side Power MOSFETs
  • Pulse Skipping Mode (PSM) with 25uA Quiescent Current in Sleep Mode
  • 100ns Minimum On-time
  • Programmable Soft-start Time
  • Frequency Spread Spectrum (FSS) Modulation for EMI Reduction
  • Precision Enable Threshold for Programmable Input Voltage Under-voltage Lock Out Protection (UVLO) Threshold and Hysteresis
  • Low Dropout Mode Operation
  • Derivable Inverting Voltage Regulator
  • Over-voltage and Over-Temperature Protection
  • Available in an ESOP-8 Package
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  Artikel Nr. SPEC Produktserie C
Tol. C VR
(V (DC))
Keramiktyp H
Technische Artikelnummer RISO
Betriebstemperatur L
Material Version Muster
885012206065 PDF WCAP-CSGP MLCCs 0603 10 ±10% 25 3.5 X7R Klasse II 0.8 X7R0603103K025DFCT10000
885012206062 PDF WCAP-CSGP MLCCs 0603 3.3 ±10% 25 3.5 X7R Klasse II 0.8 X7R0603332K025DFCT10000
885012206071 PDF WCAP-CSGP MLCCs 0603 100 ±10% 25 3.5 X7R Klasse II 0.8 X7R0603104K025DFCT10000 5 -55 °C up to +125 °C
885012206095 PDF WCAP-CSGP MLCCs 0603 100 ±10% 50 3 X7R Klasse II 0.8 X7R0603104K050DFCT10000
744325550 PDF WE-HCI SMT-Hochstrominduktivität 5.5 10 4.3 12 10.3 30 Superflux SMT