Diodes: 4A 2MHz High Performance Synchronous Buck Converter

The AP3440 is a current mode, PWM synchronous buck DC-DC converter, capable of driving a 4A load with high efficiency, excellent line and load regulation.

The device integrates two N-channel power MOSFETs with low on-resistance. The switching frequency of AP3440 can be programmed from 200kHz to 2MHz, which allows for small external components. Internally set Under voltage lockout can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is controlled by the soft-start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage. The AP3440 is available in U-QFN3030-16 package.

The Diodes Advantage:

Programmable Synchronous DCDC Buck converter with continued load current of 4A

  • Increases efficiency in light load condition


  • Over Current Protection with hiccup
  • Thermal Shutdown
  • Power Good

Flexible Switching frequency

  • Programmable with a resistor from 200kHz to 2MHz
  • Synchronize to external Clock


  • Low-voltage, High-density Power Systems
  • Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors
  • Broadband Modems
  • Networking and Optical
  • Communications Infrastructure
See also

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