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MAX5949A

更新时间： 2024-11-19 12:10:15
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
18页 192K
描述
-48V Hot-Swap Controllers with External RSENSE

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MAX5949A 数据手册

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19-3494; Rev 1; 8/11  
-48V Hot-Swap Controllers  
with External R  
SENSE  
/MAX549B  
General Description  
Features  
The MAX5949A/MAX5949B are hot-swap controllers that  
allow a circuit card to be safely hot plugged into a live  
backplane. The MAX5949A/MAX5949B operate from  
-20V to -80V and are well-suited for -48V power systems.  
These devices are pin and function compatible with the  
LT4250 and pin compatible with the LT1640.  
o Allow Safe Board Insertion and Removal  
from a Live -48V Backplane  
o Pin and Function Compatible with LT4250L  
(MAX5949A)  
o Pin Compatible with LT1640L (MAX5949A)  
The MAX5949A/MAX5949B provide a controlled turn-on  
to circuit cards preventing glitches on the power-supply  
rail and damage to board connectors and components.  
The MAX5949A/MAX5949B provide undervoltage, over-  
voltage, and overcurrent protection. These devices  
ensure the input voltage is stable and within tolerance  
before applying power to the load.  
o Pin and Function Compatible with LT4250H  
(MAX5949B)  
o Pin Compatible with LT1640H (MAX5949B)  
o Circuit-Breaker Immunity to Input Voltage Steps  
and Current Spikes  
o Withstand -100V Input Transients with No  
Both the MAX5949A and MAX5949B protect a system  
against overcurrent and short-circuit conditions by turn-  
ing off the external MOSFET in the event of a fault con-  
dition. The MAX5949A/MAX5949B also provide  
protection against input voltage steps. During an input  
voltage step, the MAX5949A/MAX5949B limit the cur-  
rent drawn by the load to a safe level without turning off  
power to the load.  
External Components  
o Programmable Inrush and Short-Circuit Current  
Limits  
o Operate from -20V to -80V  
o Programmable Overvoltage Protection  
o Programmable Undervoltage Lockout  
o Power Up into a Shorted Load  
o Power-Good Control Output  
Both devices feature an open-drain power-good status  
output (PWRGD for the MAX5949A or PWRGD for the  
MAX5949B) that can be used to enable downstream  
converters.  
The MAX5949A/MAX5949B are available in an 8-pin SO  
package. Both devices are specified for the extended  
-40°C to +85°C temperature range.  
Ordering Information  
Applications  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
8 SO  
MAX5949AESA+  
MAX5949BESA+  
Telecom Line Cards  
8 SO  
Network Switches/Routers  
Central-Office Line Cards  
Server Line Cards  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Pin Configuration  
Base-Station Line Cards  
Central-Office Switching  
-48V Distributed Power Systems  
Negative Power-Supply Controls  
TOP VIEW  
+
PWRGD  
(PWRGD)  
1
2
3
4
8
7
6
5
V
DD  
OV  
UV  
DRAIN  
GATE  
MAX5949A  
MAX5949B  
Typical Operating Circuit and Selector Guide appear at end  
of data sheet.  
V
EE  
SENSE  
SO  
( ) FOR MAX5949B.  
________________________________________________________________ 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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