Diodes Incorporated
SO 8

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


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

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AP3585B (Obsolete)

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The AP3585A/B/C is a compact synchronous-rectified buck controller specifically designed to operate from 4.5V to 13.2V supply voltage and deliver high-quality output voltage as low as 0.8V (AP3585A) or 0.6V (AP3585B/C). This SO-8EP device operates at fixed 300kHz/200kHz frequency and provides an optimal level of integration to reduce size and cost of the power supply.
This controller integrates internal MOSFET drivers that support 12V+12V bootstrapped voltage for high- efficiency power conversion. The bootstrap diode is built-in to simplify the circuit design and minimize external part count.
This controller provides single feedback loop, voltage-mode control with fast transient response. The error amplifier features a 10MHz gain-bandwidth product and 6V/μs slew rate which enables high converter bandwidth for fast transient performance.
Other features include internal soft-start, under voltage protection, over current protection and shutdown function. With afore-mentioned functions, this part provides customers a compact, high efficiency, well-protected and cost-effective solution.
The AP3585A/B/C is available in SO-8 and SO-8EP packages.


  • Supply Voltage: 4.5V to 13.2V
    • VIN Input Range: 3.3V to 12V
    • 0.8V/0.6V to 80% of VIN Output Range
    • Internal Reference: 0.8V/0.6V
  • Simple Single-loop Control
    • Voltage-mode PWM Control
    • Duty Cycle: 0% to 80%
    • Fast Transient Response
  • 10MHz High-bandwidth Error Amplifier with 6V/μs Slew Rate
  • Fixed Oscillator Frequency: 300kHz/200kHz
  • Lossless, Programmable Over Current Protection (Uses Lower MOSFET RDS(ON))
  • Start-up into Pre-biased Load
  • Built-in Thermal Shutdown
  • Built-in Soft-start
  • Over Current Protection
  • Over Voltage Protection
  • Under Voltage Protection
  • Integrated Boot Diode
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • Subsystem Power Supplies PCI, AGP, Graphics Cards, Digital TV SSTL-2 and DDR/2/3 SDRAM Bus Termination Supply
  • Cable Modems, Set Top Boxes, and DSL Modems
  • Industrial Power Supplies and General Purpose Supplies

Product Specifications

Product Parameters

Efficiency (%) 90
Frequency (Hz) 300K
MaximumInput Voltage (V) 13.2
MinimumInput Voltage (V) 4.5
Output Voltage (V) 0.8 to 10
Type Buck

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