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AP3583

Single Phase Synchronous Buck PWM Controller With Reference Input

BCD Semiconductor 

Data Sheet

Single Phase Synchronous Buck PWM Controller With Reference Input AP3583/A

General Description

The AP3583/A is a simple single-phase synchronous

buck controller. It operates from 5V or 12V supply

voltage and delivers high quality output voltage as

low as 0.6V. This device operates at fixed 200kHz

(AP3583) or 300kHz (AP3583A) frequency and

provides an optimum compromise between efficiency,

external component size and cost.

With integrated linear regulator bootstrap diode, and

N-Channel MOSFET gate drives, the AP3583/A can

reduce external component count and board space

requirements.

The AP3583/A supports both tracking mode and

stand-alone mode operation. The output voltage is

tightly regulated to the external reference voltage

from 0.4V to 3V at tracking mode or internal 0.6V

reference at stand-alone mode.

Other features include internal soft-start, under

voltage protection, over current protection and

shutdown function. With aforementioned functions,

this part provides customers a compact, high

efficiency, well-protected and cost-effective

solutions.

The AP3583/A is available in PSOP-8 package.

Features

• Supply Voltage: 5V/12V

• VIN Input Range: 3.0V to 13.2V

• 0.6V to 80% of VIN Output Range

• Internal Reference: 0.6V

• Support Tracking Mode and Stand-alone Mode

• Simple Single-loop Control

• Voltage-mode PWM Control

• Duty Cycle: 0% to 80%

• Fast Transient Response

• Fixed Oscillator Frequency: 200/300kHz

• Lossless, Programmable Over Current Protection

(Uses Lower MOSFET RDS(ON) )

• Start-up into Pre-biased Output

• Built-in Thermal Shutdown

• Built-in Soft-start

• Over Current/Voltage Protection

• Under Voltage Protection

• Integrated Boot Diode

Applications

• Power Supplies for Microprocessors/Peripherals

• PCs, Embedded Controllers, Memory Supplies

• DSP and Core Communications Processor

Supplies

• Subsystem Power Supplies

• PCI, AGP, Graphics Cards and 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

• 5V/12V Input DC-DC Regulators

• Low-voltage Distributed Power Supplies

Dec. 2011 Rev. 1. 1

PSOP-8

Figure 1. Package Type of AP3583/A

BCD Semiconductor Manufacturing Limited

1

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