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MIC2595

更新时间： 2024-09-18 22:54:51
品牌 Logo 应用领域
麦瑞 - MICREL 功率控制高压控制器
页数 文件大小 规格书
17页 101K
描述
SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS

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MIC2595 数据手册

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MIC2589/MIC2595  
Single-Channel, Negative High-Voltage Hot  
Swap Power Controllers/Sequencers  
General Description  
Features  
The MIC2589 and MIC2595 are single-channel, negative-  
voltagehotswapcontrollersdesignedtoaddresstheneedfor  
safe insertion and removal of circuit boards into “live” system  
backplanes, while using few external components. The  
MIC2589/89R and the MIC2595/95R are each available in  
14-pin SOIC packaging and work in conjunction with an  
external N-Channel MOSFET for which the gate drive is  
controlled to provide inrush current limiting and output volt-  
age slew-rate control. Overcurrent fault protection is also  
provided for which the overcurrent threshold and the  
overcurrent duration are programmable. Very fast fault re-  
sponse is provided to ensure that system power supplies  
maintain regulation even during output short circuits. This  
familyofferstworesponsestoacircuitbreakerfaultcondition:  
the MIC2589 and MIC2595 latch the circuit breaker’s output  
off if the overcurrent threshold interval is exceeded while the  
MIC2589R and MIC2595R automatically attempt to restart at  
a fixed duty cycle after a current limit fault. A primary  
Power-Good signal and two secondary (delayed and stag-  
gered) Power-Good signals are provided to indicate that the  
output voltage of the inrush current limiter is within its valid  
operatingrange. Thesesignalscanbeusedtoperformanall-  
at-once or a sequenced enabling of one or more DC-DC  
power modules.  
• Provides safe insertion and removal from live  
–48V (nominal) backplanes  
• Operates from –19V to –80V  
• Fast responding circuit breaker (<1µs) to short circuit  
conditions  
• User-programmable overcurrent detector response time  
• Electronic circuit breaker function:  
Output latch OFF (MIC2589/95) or  
Output auto-retry (MIC2589R/95R)  
• Active current regulation precisely controls inrush  
currents  
• Regulated maximum output currents into faults  
• Programmable undervoltage and overvoltage lockouts  
(MIC2589/89R)  
• Programmable UVLO hysteresis (MIC2595/95R)  
• Staggered ‘Power-Good’ outputs provide load  
sequencing  
• Fault reporting:  
Active-HIGH (MIC25XX-1) and Active-LOW  
(MIC25XX-2) 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  
DC-DC Converter  
–
48V  
RETURN  
+2.5V  
IN+  
OUT  
(Long Pin)  
100µF  
/ON/OFF  
MIC2589-1BM  
MIC2589R-1BM  
–
48V  
+2.5V  
IN–  
GND  
RETURN  
RETURN  
1
(Short Pin)  
14  
3
PWRGD1  
PWRGD2  
PWRGD3  
PGTIMER  
CFILTER  
CNLD  
VDD  
UV  
R1  
698kΩ  
1%  
12  
13  
DC-DC Converter  
IN+ OUT  
+3.3V  
2
5
6
R2  
11.8kΩ  
1%  
100µF  
/ON/OFF  
+3.3V  
RETURN  
4
IN–  
GND  
OV  
R3  
12.4kΩ  
1%  
VEE  
SENSE GATE DRAIN  
7
9
10  
11  
CFILTER  
CPG  
DC-DC Converter  
IN+ OUT  
CNLD  
R4  
0Ω  
CGATE  
+5V  
100µF  
M1  
/ON/OFF  
–
48V  
+5V  
RETURN  
IN–  
GND  
INPUT  
(Long Pin)  
RSENSE  
Input Overvoltage = 71.2V  
Input Undervoltage = 36.5V  
(See "Functional Description"ˇ 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  
M9999-031504  
March 2004  
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