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3.5A Low Iq Synchronous Buck with Enhanced EMI Reduction

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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.


  • 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


  • 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)

Product Specifications

Product Parameters

Type Buck
Efficiency 96 %
HS RDS(ON) 83 mΩ
LS RDS(ON) 43 mΩ
Frequency Typ 450 kHz
Minimum Input Voltage 3.8 V
Maximum Input Voltage 32 V
Output Current 3.5 A
Output Voltage ADJ V
Quiescent Current Typ 0.258 mA
Shutdown Current Typ 1 µA

Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques



Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP63357DV-7 Digi-Key Electronics 2399 4/3/2020 Buy Now United States
AP63357DV-7 Mouser Electronics Inc. 2974 4/3/2020 Buy Now United States
AP63357DV-7 Future Electronics - Europe 20 4/2/2020 England
AP63357DV-EVM Digi-Key Electronics 3 4/3/2020 Buy Now United States