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Data sheet

Single Phase Synchronous Buck PWM Controller AP3586A/B/C

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

General Description

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 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

solutions.

The AP3586A/B/C is available in SOIC-8 and

PSOP-8 packages.

Features

• Supply Voltage: 5V/12V

• V

Input Range: 3.3V to 12V

• 0.6V/0.8V to 82% of V

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 R

DS(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

Applications

• 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

Figure 1. Package Types of AP3586A/B/C

SOIC-8/PSOP-8

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