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MAX8686ETL

更新时间： 2024-01-15 21:41:51
品牌 Logo 应用领域
美信 - MAXIM 转换器DC-DC转换器
页数 文件大小 规格书
23页 412K
描述
Single/Multiphase, Step-Down, DC-DC Converter Delivers Up to 25A Per Phase

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MAX8686ETL 数据手册

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19-4113; Rev 1; 10/10  
Single/Multiphase, Step-Down,  
DC-DC Converter Delivers Up to 25A Per Phase  
MAX86  
General Description  
Features  
o Operating Range from 4.5V to 20V Input Supply  
o 1% Reference Voltage Accuracy Over Temperature  
The MAX8686 current-mode, synchronous PWM step-  
down regulator with integrated MOSFETs operates from  
a 4.5V to 20V input supply and generates an adjustable  
output voltage from 0.7V to 5.5V while delivering up to  
25A per phase.  
o Reference Input (REFIN) for Output Tracking or  
System Reference Voltage  
o Adjustable Switching Frequency from 300kHz  
The MAX8686 employs a peak current-mode architec-  
ture that operates with an adjustable switching frequency  
from 300kHz to 1MHz. An adjustable current-limit thresh-  
old allows for optimization for different applications with  
different load currents. Inductor current sense is  
achieved either using an external sense resistor or using  
a lossless inductor current-sense scheme. The foldback  
and hiccup current limit reduces the power dissipation  
during overload or short-circuit conditions and allows for  
autorecovery when the fault condition is removed.  
to 1MHz  
o Single/Multiphase Operation Delivers Up to  
25A/200A with Integrated MOSFETs  
o Adjustable Current Limit  
o Monotonic Output Voltage at Startup (Prebias)  
o Output Sink and Source Current Capability  
o Adjustable Soft-Start  
The MAX8686 offers the ability to start up monotonically  
even when there is a prebias output voltage. In addi-  
tion, an adjustable soft-start capability allows for a con-  
trolled turn-on. The MAX8686 features an accurate 1%  
reference and offers a reference input that allows for a  
higher accuracy reference to be used for voltage track-  
ing applications such as DDR memory.  
o Thermal-Overload Protection  
o Output Overvoltage Protection  
o Thermally Enhanced 6mm x 6mm TQFN  
Package (4W)  
Ordering Information  
The MAX8686 can be paralleled (up to eight) together  
in a true multiphase mode to deliver up to 200A of out-  
put current. When operating in this mode, this device  
achieves better than 10% current balance between  
phases at full load. The MAX8686 supports program-  
mable phase shedding to improve system efficiency  
during light load conditions.  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8686ETL+  
-40°C to +85°C  
40 TQFN-EP*  
+Denotes a lead-free package.  
*EP = Exposed pad.  
Typical Application Circuit  
Other features include an enable input and a power-OK  
(POK) indicator used for power sequencing. The  
MAX8686 also features latch overvoltage protection  
that turns on the low-side MOSFET when the output  
voltage exceeds 120% of the nominal voltage. The  
MAX8686 is offered in a thermally enhanced 40-pin,  
6mm x 6mm TQFN package.  
V
IN  
= 12V  
IN  
BST  
LX  
V
= 1.2V/25A  
OUT  
PGND  
RS+  
RS-  
REFIN  
Applications  
MAX8686  
POL Power Supplies  
Module Replacements  
Telecom Equipment  
Networking Equipment  
Servers  
CS+  
CS-  
POK  
PHASE/REFO  
COMP  
POK  
OUTPUT  
EN/SLOPE  
ENABLE  
INPUT  
DDR Memory  
FREQ  
SS GND  
ILIM  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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