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MAX8555|MAX8555A

更新时间： 2024-11-25 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
17页 425K
描述
Low-Cost. High-Reliability. 0.5V to 3.3V ORing MOSFET Controllers

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MAX8555|MAX8555A 数据手册

 浏览型号MAX8555|MAX8555A的Datasheet PDF文件第2页浏览型号MAX8555|MAX8555A的Datasheet PDF文件第3页浏览型号MAX8555|MAX8555A的Datasheet PDF文件第4页浏览型号MAX8555|MAX8555A的Datasheet PDF文件第5页浏览型号MAX8555|MAX8555A的Datasheet PDF文件第6页浏览型号MAX8555|MAX8555A的Datasheet PDF文件第7页 
13-3087; Rev 0; 1/04  
Low-Cost, High-Reliability, 0.5V to 3.3V ORing  
MOSFET Controllers  
General Description  
Features  
Critical loads often employ parallel-connected power  
supplies with redundancy to enhance system reliability.  
The MAX8555/MAX8555A are highly integrated, inex-  
pensive MOSFET controllers that provide isolation and  
redundant power capability in high-reliability systems.  
The MAX8555/MAX8555A are used in 0.5V to 3.3V sys-  
tems, and have an internal charge pump to drive the  
♦ Simple, Integrated, and Inexpensive MOSFET  
Controllers  
♦ ORing FET Drive for 0.5V to 3.3V  
♦ Eliminate ORing Diode Power Dissipation  
♦ Provide N+1 Redundant Supply Capability for  
gates of the N-channel pass elements to (V  
+ 5V).  
Highly Reliable Systems  
CS+  
During startup, the MAX8555/MAX8555A monitor the  
voltage drop across the external MOSFETs. Once V  
♦ Isolate Failed Short-Circuit Supply from  
CS+  
), the  
Output BUS  
approaches or exceeds the bus voltage (V  
CS-  
♦ Respond to Reverse Short-Circuit Current  
MOSFETs are turned on. The MAX8555/MAX8555A fea-  
ture a dual-purpose TIMER input. A single external  
resistor from TIMER to ground sets the turn-on speed of  
the external MOSFETs. Optionally, the TIMER input can  
be used as a logic enable input. Once the external  
MOSFET is turned on, these controllers monitor the  
load, protecting the bus against overvoltage, undervolt-  
age, and reverse-current fault conditions. The  
MAX8555 is available with a 40mV reverse-current  
threshold, while the MAX8555A is available with a 20mV  
reverse-current threshold.  
in 200ns  
♦ Adjustable Blank Time  
♦ Programmable Soft-Start  
♦ Logic Enable Input  
♦ Adjustable Overvoltage and Undervoltage  
Trip Points  
♦ Fault-Indicator Output  
♦ Space-Saving Packages  
Overvoltage and undervoltage fault thresholds are  
adjustable and can be disabled. The current-limit trip  
Ordering Information  
points are set by the external MOSFETs’ R  
,
DS(ON)  
reducing component count. An open-drain, logic-low  
fault output indicates if an overvoltage, undervoltage, or  
reverse-current fault occurs. The MAX8555 and the  
MAX8555A can shut down in response to a reverse-  
current fault condition as quickly as 200ns.  
TEMP  
RANGE  
PIN-  
PACKAGE  
TOP  
MARK  
PART  
10 TDFN  
3mm x 3mm*  
MAX8555ETB  
MAX8555EUB  
MAX8555AETB  
-40°C to 85°C  
ACC  
8555EUB  
ADD  
Both devices come in space-saving 10-pin µMAX or  
TDFN packages and are specified over the extended  
-40°C to +85°C temperature range.  
-40°C to 85°C 10 µMAX  
10 TDFN  
3mm x 3mm*  
-40°C to 85°C  
MAX8555AEUB  
-40°C to 85°C 10 µMAX  
8555AEUB  
Applications  
*Exposed paddle  
Point-of-Load Supplies  
Power-Supply Modules  
Servers  
Pin Configurations  
TOP VIEW  
Telecom Power Supplies  
Rectifiers  
GATE  
GND  
VL  
1
2
3
4
5
10 CS+  
GATE  
GND  
VL  
1
2
3
4
5
10 CS+  
Redundant Power Supplies in High-Availability  
Systems  
9
8
7
6
CS-  
9
8
7
6
CS-  
MAX8555/  
MAX8555A  
MAX8555/  
MAX8555A  
OVP  
OVP  
V
DD  
FAULT  
TIMER  
V
DD  
FAULT  
TIMER  
UVP  
UVP  
Typical Operating Circuit appears at end of data sheet.  
µMAX  
TDFN  
________________________________________________________________ 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...17

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