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3.8V-32V INPUT, 3A Low Iq Synchronous Buck with Enhanced EMI Reduction

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The AP63300/AP63301 is a 3A, synchronous buck converter with a wide input voltage range of 3.8V to 32V. The device fully integrates a 75mΩ high-side power MOSFET and a 40mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP63300/AP63301 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 AP63300/AP63301 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. AP63300 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 a TSOT26 package.


  • 5V, 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
  • Gaming Consoles
  • Consumer Electronics
  • General Purpose Point of Load


  • VIN 3.8V to 32V
  • 3A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 22μA Low Quiescent Current (Pulse Frequency Modulation)
  • 500kHz Switching Frequency
  • Supports Pulse Frequency Modulation (PFM)

- AP63300

- Up to 88% Efficiency at 5mA Light Load

  • Pulse Width Modulation (PWM) Regardless of Output Load

- AP63301

  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI

- AP63300

  • 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 96 %
HS RDS(ON) 83 mΩ
LS RDS(ON) 43 mΩ
Frequency Typ 500 kHz
Minimum Input Voltage 3.8 V
Maximum Input Voltage 32 V
Output Current 3 A
Output Voltage ADJ V
Quiescent Current Typ 0.258 mA
Shutdown Current Typ 1 µA

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 5095 3/4/2021 Europe, Asia, North America Buy Now
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Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 6 3/4/2021 Europe, Asia, North America Buy Now
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