AP64351SP-13

The AP64351 is a 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 75mΩ highside power MOSFET and a 45mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. The AP64351 device is easily used by minimizing the external component count due to its adoption of peak current mode control. The AP64351 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. AP64351 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.

Applications

• 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

Key features

• VIN 3.8V to 40V
• 3.5A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 22μA 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
• Halogen and Antimony Free. “Green” Device