Diodes Incorporated
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AP3598A (Obsolete)

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The AP3598A is a dual-phase synchronous buck PWM controller with integrated drivers which are optimized for high performance graphic card and computer applications. The IC is capable of delivering up to 60A output current capability, supporting 12V MOSFET drivers with internal bootstrap diodes.
The dynamic output voltage could be implemented by analog method with a switching device and a resistor network. The adjustable current balance is achieved by RDS(ON) current sensing technique.
The AP3598A provides over current protection, input/output under voltage protection, over voltage protection and over temperature protection.
Other features include adjustable soft start, adjustable operation frequency and so on. With aforementioned functions, the IC adopts U-QFN4040-24 package.


  • Operate with Single Supply Voltage
  • Reference Voltage Output with 1% Accuracy
  • Simple Single Loop Voltage Mode Control
  • 12V Bootstrapped Drivers with Internal Boot-strap Diodes
  • Adjustable Current Balancing by RDS(ON) Current Sensing
  • Adjustable Operation Frequency from 200kHz to7500kHz Per Phase
  • External Compensation
  • Dynamic Output Voltage Adjustment
  • Adjustable Soft Start
  • Built-in UV and OV Protection Function
  • Built-in Over Current Protection
  • Built-in Thermal Shutdown Function
  • U-QFN4040-24 Package
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • Middle-High End Graphic Card
  • Generic Desktop and Consumer Electronics

Product Specifications

Product Parameters

Efficiency (%) 88
Frequency (Hz) 200K to 500K
MaximumInput Voltage (V) 13.2
MinimumInput Voltage (V) 4.5
Output Voltage (V) ADJ
Type Buck

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