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MIC2085

更新时间： 2024-01-03 05:33:07
品牌 Logo 应用领域
麦瑞 - MICREL 控制器
页数 文件大小 规格书
28页 406K
描述
Single Channel Hot Swap Controllers

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MIC2085 数据手册

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MIC2085/MIC2086  
Single Channel Hot Swap Controllers  
General Description  
Features  
The MIC2085 and MIC2086 are single channel positive  
voltage hot swap controllers designed to allow the safe  
insertionofboardsintolivesystembackplanes. TheMIC2085  
and MIC2086 are available in 16-pin and 20-pin QSOP  
packages, respectively. Using a few external components  
and by controlling the gate drive of an external N-Channel  
MOSFET device, the MIC2085/86 provide inrush current  
limiting and output voltage slew rate control in harsh, critical  
power supply environments. Additionally, a circuit breaker  
function will latch the output MOSFET off if the current limit  
threshold is exceeded for a programmed period of time. The  
devices’ array of features provide a simplified yet robust  
solution for many network applications in meeting the power  
supply regulation requirements and affords protection of  
critical downstream devices and components.  
• MIC2085: Pin for pin functional equivalent to the  
LTC1642  
• 2.3V to 16.5V supply voltage operation  
• Surge voltage protection to 33V  
• Operating temperature range –40°C to 85°C  
• Active current regulation limits inrush current  
independent of load capacitance  
• Programmable inrush current limiting  
• Analog foldback current limiting  
• Electronic circuit breaker  
• Dual-level overcurrent fault sensing  
• Fast response to short circuit conditions (< 1µs)  
• Programmable output undervoltage detection  
• Undervoltage lockout protection  
• Power-on reset (MIC2085/86) and  
power-good (MIC2086) status outputs  
• /FAULT status output  
All support documentation can be found on Micrel’s web  
site at www.micrel.com.  
• Driver for SCR crowbar on overvoltage  
Applications  
• RAID systems  
• Cellular base stations  
• LAN servers  
• WAN servers  
• InfiniBand™ Systems  
• Industrial high side switching  
Typical Application  
RSENSE  
0.007Ω  
2%  
Q1  
Backplane PCB Edge  
Connector Connector  
Long  
Pin  
Si7884DP  
(PowerPAKTM SO-8)  
VIN  
12V  
1
2
VOUT  
12V@5A  
3
4
R1  
3.3Ω  
CLOAD  
220  
C1  
µ
F
1
µ
F
R7  
127kΩ  
1%  
*R6  
10Ω  
Short  
Pin  
VLOGIC  
16  
15  
VCC  
SENSE  
14  
GATE  
COMP+  
R5  
47kΩ  
R2  
R10  
47kΩ  
R11  
100kΩ  
11  
10  
47kΩ  
Output Signal  
(Power Good)  
1%  
4
6
COMPOUT  
PWRGD  
LOGIC  
ON  
C2  
/FAULT  
0.022µF  
/FAULT  
CONTROLLER  
5
7
R3  
1.82kΩ  
1%  
MIC2085  
/POR  
FB  
/RESET  
Medium  
(or Short)  
Pin  
Power-On Reset  
Output  
9
OV  
R4  
10kΩ  
1%  
R8  
12  
13  
COMP—  
REF  
16.2kΩ  
1%  
1
Q2  
2N4401  
CRWBR  
Q3  
TCR22-4  
C7  
CPOR  
3
GND CFILTER  
8
0.033µF  
2
**R9  
180Ω  
C3  
0.1  
C4  
0.1  
C5  
8200pF  
C6  
0.01µF  
µ
F
µF  
GND  
Long  
Pin  
Overvoltage (Input) = 13.3V  
Undervoltage Lockout = 10.8V  
Undervoltage (Output) &  
POR/START-UP DELAY = 60ms  
Circuit-Breaker Response Time = 500µs  
*R6 is an optional component used for noise filtering  
**R9 needed when using a sensitive gate SCR  
Power-Good (Output) = 11.4V  
InfiniBand is a trademark of InfiniBand Trade Association  
PowerPAK is a trademark of Vishay Intertechnology Inc.  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
M0235-121903  
January 2004  
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