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AP3581A Datasheet, PDF (1/13 Pages) – | |||
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OBSOLETE
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
General Description
The1AP3581A/B/C1is1a1compact1synchronous-rect
ified buck controller specifically designed to operate
from 5V/12V supply and deliver high-quality output
voltage as low as 0.6V (AP3581A) or 0.8V
(AP3581B/C). The AP3581A/B/C operates at fixed
frequency of 300kHz (AP3581A/B) or 200kHz
(AP3581C) 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 AP3581A/B/C is available in PSOP-8 package.
Features
⢠Supply Voltage: 5V/12V
⢠VIN Input Range: 3.0V to 13.2V
⢠0.6V/0.8V to 80% of VIN Output Range
⢠Internal Reference: 0.6V/0.8V
⢠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 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, 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
Oct. 2011 Rev. 1. 0
PSOP-8
Figure 1. Package Type of AP3581A/B/C
BCD Semiconductor Manufacturing Limited
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