Diodes Incorporated
SO 8

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AP3586B (Obsolete)

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The AP3586A/B/C is a compact synchronous -rectified buck controller specifically designed to operate from 5V or 12V supply voltage and deliver high-quality output voltage as low as 0.6V (AP3586A) or 0.8V (AP3586B/C). This device operates at fixed 300kHz (AP3586A/B) or 200kHz (AP3586C) 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 highefficiency 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 solutions. The AP3586A/B/C is available in SOIC-8 and PSOP-8 packages.


  • Supply Voltage: 5V/12V
  • VIN Input Range: 3.3V to 12V
  • 0.6V/0.8V to 82% of VIN Output Range
  • Internal Reference: 0.6V/0.8V
  • Simple Single-loop Control
  • Voltage-mode PWM Control
  • Duty Cycle: 0% to 82%
  • 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


  • 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) 300 Fixed
MaximumInput Voltage (V) 13.2
MinimumInput Voltage (V) 4.5
Output Voltage (V) 0.8 to ADJ
Type Buck

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