Diodes AP3581A/B/C Manuel d'utilisateur

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Data Sheet
Single Phase Synchronous Buck PWM Controller AP3581A/B/C
Oct. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
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
V
IN
Input Range: 3.0V to 13.2V
0.6V/0.8V to 80% of V
IN
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 R
DS(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
Figure 1. Package Type of AP3581A/B/C
PSOP-8
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Résumé du contenu

Page 1

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 2 - Pin Description

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 3

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 4

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 5 - Electrical Characteristics

IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the

Page 6

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 7 - For AP3581A

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 8

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 9

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 10

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 11

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 12 - 3.402(0.134)

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

Page 13

Data Sheet Single Phase Synchronous Buck PWM Controller AP3581A/B/C Oct. 2011

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