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MIC2594

更新时间： 2024-11-07 22:54:51
品牌 Logo 应用领域
麦瑞 - MICREL 高压控制器
页数 文件大小 规格书
14页 84K
描述
Single-Channel, Negative High-Voltage Hot Swap Power Controllers

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MIC2594 数据手册

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MIC2588/MIC2594  
Single-Channel, Negative High-Voltage Hot  
Swap Power Controllers  
General Description  
Features  
The MIC2588 and the MIC2594 are single-channel, nega-  
tive-voltage hot swap controllers designed to address the  
needforsafeinsertionandremovalofcircuitboardsinto“live”  
high-voltage system backplanes, while using very few exter-  
nal components. The MIC2588 and the MIC2594 are each  
available in an 8-pin SOIC package and work in conjunction  
withanexternalN-ChannelMOSFETforwhichthegatedrive  
is controlled to provide inrush current limiting and output  
voltage slew-rate control. Overcurrent fault protection is also  
provided for which the overcurrent threshold is program-  
mable. During an output overload condition, a constant-  
current regulation loop is engaged to ensure that the system  
power supply maintains regulation. If a fault condition ex-  
ceeds a built-in 400µs nuisance-trip delay, the MIC2588 and  
the MIC2594 will latch the circuit breaker’s output off and will  
remain in the off state until reset by cycling either the UV/OFF  
pin or the power to the IC. A master Power-Good signal is  
provided to indicate that the output voltage of the soft-start  
circuit is within its valid output range. This signal can be used  
to enable one or more DC-DC converter modules.  
• MIC2588:  
Pin-for-pin functional equivalent to the  
LT1640/LT1640A/LT4250  
• Provides safe insertion and removal from live –48V  
(nominal) backplanes  
• Operates from –19V to –80V  
• Electronic circuit breaker function  
• Built-in 400µs “nuisance-trip” delay (t  
• Regulated maximum output current into faults  
• Programmable inrush current limiting  
• Fast response to short circuit conditions (< 1µs)  
• Programmable undervoltage and overvoltage lockouts  
(MIC2588-xBM)  
)
FLT  
• Programmable UVLO hysteresis (MIC2594-xBM)  
• Fault reporting:  
Active-HIGH (-1BM) and Active-LOW  
(-2BM) Power-Good signal output  
Applications  
• Central office switching  
• –48V power distribution  
• Distributed power systems  
All support documentation can be found on Micrel’s web  
site at www.micrel.com.  
Typical Application  
–
48V  
RETURN  
(Long Pin)  
–
48V  
MIC2588-2BM  
RETURN  
(Short Pin)  
R1  
698kΩ  
1%  
8
DC-DC Converter  
IN+ OUT+  
/ON/OFF  
VDD  
+5VOUT  
3
2
1
7
UV  
OV  
/PWRGD  
DRAIN  
R2  
11.8kΩ  
1%  
5V  
RETURN  
IN–  
OUT  
–
VEE  
SENSE  
GATE  
4
5
6
CFDBK  
R3  
12.4kΩ  
1%  
RFDBK  
CGATE  
R4  
M1  
0.1µF 100µF  
–
48V  
INPUT  
(Long Pin)  
RSENSE  
Input Overvoltage = 71.2V  
Input Undervoltage = 36.5V  
(See "Functional Description" for more detail)  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
M9999-122303  
December 2003  
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