need for safe insertion and removal of circuit boards into 鈥渓ive鈥?/div>
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
with an external N-Channel MOSFET for which the gate drive
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 400碌s nuisance-trip delay, the MIC2588 and
the MIC2594 will latch the circuit breaker鈥檚 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.
All support documentation can be found on Micrel鈥檚 web
site at www.micrel.com.
Features
鈥?MIC2588:
Pin-for-pin functional equivalent to the
LT1640/LT1640A/LT4250
鈥?Provides safe insertion and removal from live 鈥?8V
(nominal) backplanes
鈥?Operates from 鈥?9V to 鈥?0V
鈥?Electronic circuit breaker function
鈥?Built-in 400碌s 鈥渘uisance-trip鈥?delay (t
FLT
)
鈥?Regulated maximum output current into faults
鈥?Programmable inrush current limiting
鈥?Fast response to short circuit conditions (< 1碌s)
鈥?Programmable undervoltage and overvoltage lockouts
(MIC2588-xBM)
鈥?Programmable UVLO hysteresis (MIC2594-xBM)
鈥?Fault reporting:
Active-HIGH (-1BM) and Active-LOW
(-2BM) Power-Good signal output
Applications
鈥?Central office switching
鈥?鈥?8V power distribution
鈥?Distributed power systems
Typical Application
鈥?8V
RETURN
(Long Pin)
鈥?8V
RETURN
(Short Pin)
R1
698k鈩?/div>
1%
3
MIC2588-2BM
8
VDD
UV
/PWRGD
DRAIN
DC-DC Converter
IN+
OUT+
+5V
OUT
5V
RETURN
1
/ON/OFF
IN鈥?/div>
OUT鈥?/div>
R2
11.8k鈩?/div>
1%
2
OV
VEE
4
7
SENSE
5
GATE
6
R3
12.4k鈩?/div>
1%
C
FDBK
C
GATE
R4
M1
R
FDBK
0.1碌F
100碌F
鈥?8V
INPUT
(Long Pin)
R
SENSE
Input Overvoltage = 71.2V
Input Undervoltage = 36.5V
(See "Functional Description" for more detail)
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
December 2003
1
M9999-122303
MIC2588 PDF文件相關(guān)型號(hào)
MIC2594,MIC2594-1BM,MIC2594-2BM
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