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MAX8529

更新时间： 2024-11-24 23:51:59
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
21页 553K
描述
1.5MHz Dual 180°. Out-of-Phase PWM Step-Down Controller with POR

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MAX8529 数据手册

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19-2696; Rev 0; 1/03  
1.5MHz Dual 180° Out-of-Phase  
PWM Step-Down Controller with POR  
General Description  
Features  
The MAX8529 dual, synchronized, step-down controller  
generates two outputs from input supplies ranging from  
4.75V to 23V. Each output is adjustable from sub-1V  
to 18V. Input voltage ripple and total RMS input ripple  
current are reduced by synchronized 180-degree out-of-  
phase operation.  
o Low Output Noise in DSL Band  
o Ceramic Input/Output Capacitors  
o Step-Down or Step-Up/Step-Down Operation  
o Four Output, 90-Degree Out-of-Phase Operation  
(Using Two MAX8529s)  
The switching frequency is adjustable from 600kHz to  
1.5MHz with an external resistor. Alternatively, the con-  
troller can be synchronized to an external clock gener-  
ated to another MAX8529 or a system clock. One  
MAX8529 can be set to generate an in-phase, or 90-  
degree out-of-phase, clock signal for synchronization  
with additional controllers. This allows two controllers to  
operate either as an interleaved two- or four-phase sys-  
tem with each output shifted by 90 degrees. These  
devices also feature soft-start and soft-stop.  
o Foldback Current Limit  
o 4.75V to 23V Input Supply Range  
o 0 to 18V Output Voltage Range (Up to 6A)  
o >90% Efficiency  
o Fixed-Frequency PWM Operation  
o Adjustable 600kHz to 1.5MHz Switching  
Frequency  
The MAX8529 eliminates the need for current-sense  
resistors by utilizing the low-side MOSFET’s on-resis-  
tance as a current-sense element. This protects the  
DC-to-DC components from damage during output  
overload conditions or when output short circuit faults  
without requiring a current-sense resistor. Adjustable  
foldback current limit reduces power dissipation during  
short-circuit conditions. The MAX8529 includes a  
power-on reset output to signal the system when both  
outputs reach regulation.  
o External SYNC Input  
o Clock Output for Master/Slave Synchronization  
o Soft-Start and Soft-Stop  
o RST Output with 140ms Minimum Delay  
o Lossless Current Limit (No Sense Resistor)  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
The MAX8529 is available in a 24-pin QSOP package. An  
evaluation kit is available to speed designs.  
MAX8529EEG  
-40°C to +85°C  
24 QSOP  
Pin Configuration  
Applications  
xDSL Modems and Routers  
DSP, ASIC, and FPGA Power Supplies  
Set-Top Boxes  
TOP VIEW  
COMP2  
FB2  
1
2
3
4
5
6
7
8
9
24 EN  
23 DH2  
Broadband Routers  
ILIM2  
OSC  
V+  
22  
LX2  
21 BST2  
20 DL2  
REF  
MAX8529  
19 V  
L
GND  
CKO  
SYNC  
18 PGND  
17 DL1  
16 BST1  
ILIM1 10  
FB1 11  
15  
14  
LX1  
DH1  
COMP1 12  
13 RST  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...21

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