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The AP63300Q/AP63301Q is an automotive-compliant, 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 AP63300Q/AP63301Q 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 AP63300Q/AP63301Q 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. The AP63300Q 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.


  • AEC-Q100 Qualified for Automotive Applications
    • Device Temperature Grade 1: -40°C to +125°C TA Range
  • VIN: 3.8V to 32V
  • Output Voltage (VOUT): 0.8V to VIN
  • 3A Continuous Output Current
  • 8V ± 1% Reference Voltage
  • 22µA Low Quiescent Current (Pulse Frequency Modulation)
  • 500kHz Switching Frequency
  • Supports Pulse Frequency Modulation (PFM)
    • AP63300Q
    • Up to 88% Efficiency at 5mA Light Load
  • Pulse Width Modulation (PWM) Regardless of Output Load
    • AP63301Q
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
    • AP63300Q
  • 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 
  • The AP63300Q and AP63301Q are suitable for automotive applications requiring specific change control; these parts are AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Automotive Power Systems
  • Automotive Infotainment
  • Automotive Instrument Clusters
  • Automotive Body Electronics and Lighting
  • Automotive Telematics
  • Advanced Driver Assistance Systems

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Automotive
Type Buck
Minimum Input Voltage (V) 3.8
Maximum Input Voltage (V) 32
Output Current (A) 3
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) VIN
Quiescent Current Typ (µA) 22
Shutdown Current Typ (µA) 1
Frequency Typ (kHz) 500
HS RDS(ON) (mΩ) 75
LS RDS(ON) (mΩ) 40
Features Enable, Light Load Efficiency, Soft-start Fixed, Internal Loop Compensation, UVLO Adjustable, Frequency Spread Spectrum, OVP, Overcurrent Protection, Thermal Shutdown, Synchronous Rectification

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