Diodes Incorporated

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

Back to Buck Converter


4.2V to 18V Input, 4A Low IQ Synchronous Buck Converter

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The AP62400 is a 4A, synchronous buck converter with a wide input voltage range of 4.2V to 18V. The device fully integrates a 50mΩ high-side power MOSFET and a 22mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP62400 device is easily used by minimizing the external component count due to its adoption of Constant On-Time (COT) control to achieve fast transient response, easy loop stabilization, and low output voltage ripple.

The AP62400 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.

AP62400 is available in TSOT26 package.


  • VIN: 4.2V to 18V
  • Output Voltage (VOUT): 0.8V to 7V
  • 4A Continuous Output Current
  • 8V ± 1% Reference Voltage (TA = +25°C)
  • 190μA Low Quiescent Current (Pulse Frequency Modulation)
  • 800kHz Switching Frequency (VIN = 12V, VOUT = 5V)
  • Up to 83% Efficiency at 5mA Light Load
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Protection Circuitry
    • Undervoltage Lockout (UVLO)
    • Cycle-by-Cycle Valley Current Limit
    • Thermal Shutdown
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • 5V and 12V distributed power bus supplies
  • Flat screen TV sets and monitors
  • White goods and small home appliances
  • FPGA, DSP, and ASIC supplies
  • Home audio
  • Network systems
  • Gaming consoles
  • Consumer electronics
  • General-purpose point of loads

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 4.2
Maximum Input Voltage (V) 18
Output Current (A) 4
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) 7
Quiescent Current Typ (µA) 190
Shutdown Current Typ (µA) 1.5
Frequency Typ (kHz) 800
HS RDS(ON) (mΩ) 50
LS RDS(ON) (mΩ) 22
Features Enable Light Load Efficiency Soft-start Fixed UVLO Adjustable Overcurrent Protection Thermal Shutdown Power-Good Synchronous Rectification

Related Content


Technical Documents

Recommended Soldering Techniques