Description

The AP63356/AP63357 is a 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 32V. The device fully integrates a 74mΩ high-side power MOSFET and a 40mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP63356/AP63357 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network. 

The AP63356/AP63357 design is optimized for Electromagnetic Interference (EMI) reduction. The converter 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. It also 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.

The device is available in a 3mm × 2mm V-DFN3020-13 package.

Application(s)

• 12V and 24V Distributed Power Bus Supplies
• Flat Screen TV Sets and Monitors
• Power Tools and Laser Printers
• White Goods and Small Home Appliances
• FPGA, DSP, and ASIC Supplies
• Home Audio
• Network Systems
• Set Top Boxes
• Gaming Consoles
• Consumer Electronics

Feature(s)

• VIN 3.8V to 32V
• 3.5A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 22μA Ultralow Quiescent Current (Pulse Frequency Modulation)
• 450kHz Switching Frequency
• Pulse Width Modulation (PWM) Regardless of Output Load

• AP63356
• Supports Pulse Frequency Modulation (PFM)
• AP63357
• Up to 86% Efficiency at 5mA Light Load
• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• Low-Dropout (LDO) Mode
• Power Good Indicator with 5MΩ Internal Pull-up
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry
• Undervoltage Lockout (UVLO)
• Output Undervoltage Protection (UVP)
• 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)