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Diodes Incorporated


40V, 2.2MHz, Synchronous Buck Converters Deliver High Efficiency Across All Loads

The DIODES™ AP64500 is a 5A (3.5A for AP64350) synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 45mΩ (75 mΩ for AP64350) highside power MOSFET and a 20mΩ (45 mΩ for AP64350) low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP64500 and AP64350 devices are easily used by minimizing the external component count due to its adoption of peak current mode control.

The AP64500 and AP64350 designs are 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. AP64500 and AP64350 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.

  • VIN 3.8V to 40V
  • 5A for AP64500 (3.5A for AP64350) Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 25μA for AP64500 (22μA for AP64350) Low Quiescent Current (Pulse Frequency Modulation)
  • Programmable Switching Frequency: 100kHz to 2.2MHz
  • External Clock Synchronization: 100kHz to 2.2MHz
  • 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
  • Halogen and Antimony Free. “Green” Device
  • 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