Diodes Incorporated

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3.8V-32V INPUT, 2A Low Iq Synchronous Buck with Enhanced EMI Reduction

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The AP63200/AP63201/AP63203/AP63205 are 2A, synchronous buck converters with a wide input voltage range of 3.8V to 32V and fully integrates a 125mΩ high-side power MOSFET and a 68mΩ low-side power MOSFET to provide high-efficiency step-down DC/DC conversion.

The AP63200/AP63201/AP63203/AP63205 devices are easily used by minimizing the external component count due to their adoption of peak current mode control along with its integrated compensation network.

The AP63200/AP63201/AP63203/AP63205 have optimized designs 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. They also have a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which further erases high-frequency radiated EMI noise caused by MOSFET switching.

The devices are available in a low-profile, TSOT26 package.


  • VIN 3.8V to 32V
  • 2A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 22µA Ultralow Quiescent Current
  • Switching Frequency
    o 500kHz: AP63200 and AP63201
    o 1.1MHz: AP63203 and AP63205
  • Pulse Width Modulation (PWM) Regardless of Output Load
    o AP63201
  • Supports Pulse Frequency Modulation (PFM)
    o AP63200, AP63203, and AP63205
    o Up to 80% Efficiency at 1mA Light Load
    o Up to 88% Efficiency at 5mA Light Load
  • Fixed Output Voltage
    o 3.3V: AP63203
    o 5.0V: AP63205
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
  • Precision Enable Threshold to Adjust UVLO
  • Protection Circuitry
    o Overvoltage Protection
    o Cycle-by-Cycle Peak Current Limit
    o Thermal Shutdown
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)


  • 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

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 3.8
Maximum Input Voltage (V) 32
Output Current (A) 2
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) VIN
Quiescent Current Typ (µA) 258
Shutdown Current Typ (µA) 1
Frequency Typ (kHz) 500
HS RDS(ON) (mΩ) 125
LS RDS(ON) (mΩ) 68
Features Enable,Forced PWM,Soft-start Fixed,Internal Loop Compensation,UVLO Adjustable,OVP,Overcurrent Protection,Thermal Shutdown,Synchronous Rectification

Related Content


Technical Documents

Evaluation Boards and User Guides


Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2605 2023-03-09 2023-06-09 Qualified Additional Cu Pillar Bump Site and Bill of Materials (BOM) Lead Frame Material
PCN-2534 2021-07-29 2021-10-29 Qualified Additional BUMP Site (LBS) and Assembly/Test (A/T) Site (CAT)