Diodes AP3586A/B/C - Manual

Data sheet
Single Phase Synchronous Buck PWM Controller AP3586A/B/C
Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
1
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
IN
Input Range: 3.3V to 12V
• 0.6V/0.8V to 82% of V
IN
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