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The AP64501 is a 5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 45mΩ highside power MOSFET and a 20mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP64501 device is easily used by minimizing the external component count due to its adoption of peak current mode control.

The AP64501 design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64501 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.

The device is available in an SO-8EP package.


  • 5V, 12V, and 24V Distributed Power Bus Supplies
  • Power Tools and Laser Printers
  • White Goods and Small Home Appliances
  • Home Audio
  • Network Systems
  • Consumer Electronics
  • General Purpose Point of Load


  • VIN 3.8V to 40V
  • 5A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 25μA Low Quiescent Current (Pulse Frequency Modulation)
  • 570kHz Switching Frequency
  • Programmable Soft-Start Time
  • Up to 85% Efficiency at 5mA Light Load
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
  • Low-Dropout (LDO) Mode
  • Precision Enable Threshold to Adjust UVLO
  • Protection Circuitry
  • Undervoltage Lockout (UVLO)

- Output Overvoltage Protection (OVP

- Cycle-by-Cycle Peak Current Limit

- Thermal Shutdown

  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)

Product Specifications

Product Parameters

Type Buck
Efficiency 95 %
HS RDS(ON) 45 mΩ
LS RDS(ON) 20 mΩ
Frequency Typ 570 kHz
Minimum Input Voltage 3.8 V
Maximum Input Voltage 40 V
Output Current 5 A
Output Voltage ADJ V
Quiescent Current Typ 0.025 mA
Shutdown Current Typ 1 µA

Technical Documents

Evaluation Board User Guides

Recommended Soldering Techniques
Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP64501SP-13 Digi-Key Electronics 3643 2/25/2020 Buy Now United States
AP64501SP-EVM Digi-Key Electronics 2 2/25/2020 Buy Now United States