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APW7066QAC-TRL 参数 Datasheet PDF下载

APW7066QAC-TRL图片预览
型号: APW7066QAC-TRL
PDF下载: 下载PDF文件 查看货源
内容描述: 双同步降压PWM控制器和一个线性控制器 [Dual Synchronous Buck PWM Controllers and One Linear Controller]
分类和应用: 控制器
文件页数/大小: 34 页 / 971 K
品牌: ANPEC [ ANPEC ELECTRONICS COROPRATION ]
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APW7066
Dual Synchronous Buck PWM Controllers and One Linear Controller
Features
Two Synchronous Buck Converters and
a Linear Regulator
VIN range up to 12V
Input Power Supplies Require 12V and 5V or
use 12V to generate a Shunt Regulator 5.8V
0.6V Reference for VOUT1 and VOUT3
with 0.8% accurate
3.3V Reference for VOUT2 with 0.8% accurate
Buffered VTT Reference Output
Three Outputs have Independent Soft-Start
and Enable
Internal 300kHz Oscillator and Programmable
Frequency range from 70 kHz to 800kHz
Synchronous Switching Frequency
DDR mode or Independent Mode Selection
Phase Shift Selection
Power Good Function
Short-Circuit Protection for VOUT1 and VOUT2
Thermally Enhanced TSSOP-24 and QFN-32
Package
Lead Free Available (RoHS Compliant)
General Description
The APW7066 has two synchronous buck PWM
controllers and one linear controller with high
precision internal references voltage to offer accurate
outputs. The PWM controllers are designed to drive
two N-channel MOSFETs in synchronous buck
topology, and the linear controller drives an external
N-channel MOSFET. The device requires 12V and 5V
power supplies, if the 5V supply is not available,
VCC12 can offer an optional shunt regulator 5.8V for
5V supply.
All outputs have independent soft-start and enable
functions by SS/EN pins to control. Connect a capacitor
from each SS/EN pin to the ground for setting the
soft-start time, and pulling the SS/EN pin below 1V to
disable regulator. Pull the SS2/EN2 to VCC, enter the
DDR mode, the SS1/EN1 controls both VOUT1 and
VOUT2, and allows VOUT2 to track VOUT1. It also
offers the phase shift function by REFOUT pin to
select the phase shift between VOUT1 and VOUT2 in
DDR mode or Independent mode. When all SS/EN
pins exceed 3.3V and no faults are detected, the
PGOOD pin goes high to indicate the regulators are
ready. If any of the SS/EN pins goes below 3.2V or
any of the outputs has a fault condition, the PGOOD
pin will be pulled low.
The internal oscillator is nominally 300kHz (keep the
FS/SYNC pin open or short to GND), and it offers the
programmable frequency function from 70kHz to
800kHz; connecting a resistor from FS/SYNC to VCC
to decrease the frequency, conversely, connect a
resistor from FS/SYNC to GND to increase the frequency.
The IC also provides the synchronous frequency function.
Connect the LGATE signal of another converter to
FS/SYNC pin; forcing the switching frequency to follow
Applications
Graphic Cards
DDR memory Power Supplies
Low-Voltage Distributed Power Supplies
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Jun., 2005
1
www.anpec.com.tw