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MIC2588 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – Single-Channel, Negative High-Voltage Hot Swap Power Controllers | |||
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MIC2588/MIC2594
Micrel
MIC2588/MIC2594
Single-Channel, Negative High-Voltage Hot
Swap Power Controllers
General Description
The MIC2588 and the MIC2594 are single-channel, nega-
tive-voltage hot swap controllers designed to address the
need for safe insertion and removal of circuit boards into âliveâ
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 400µs nuisance-trip delay, the MIC2588 and
the MIC2594 will latch the circuit breakerâs 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 Micrelâs web
site at www.micrel.com.
Features
⢠MIC2588:
Pin-for-pin functional equivalent to the
LT1640/LT1640A/LT4250
⢠Provides safe insertion and removal from live â48V
(nominal) backplanes
⢠Operates from â19V to â80V
⢠Electronic circuit breaker function
⢠Built-in 400µs ânuisance-tripâ delay (tFLT)
⢠Regulated maximum output current into faults
⢠Programmable inrush current limiting
⢠Fast response to short circuit conditions (< 1µs)
⢠Programmable undervoltage and overvoltage lockouts
(MIC2588-xBM)
⢠Programmable UVLO hysteresis (MIC2594-xBM)
⢠Fault reporting:
Active-HIGH (-1BM) and Active-LOW
(-2BM) Power-Good signal output
Applications
⢠Central office switching
⢠â48V power distribution
⢠Distributed power systems
Typical Application
â48V
RETURN
(Long Pin)
â48V
RETURN
(Short Pin)
R1
698kâ¦
1%
R2
11.8kâ¦
1%
MIC2588-2BM
3 UV
8
VDD
1
/PWRGD
2
OV
DRAIN 7
â48V
INPUT
(Long Pin)
R3
12.4kâ¦
1%
VEE
4
SENSE
5
GATE
6
CFDBK
CGATE
RFDBK
R4
M1
Input Overvoltage = 71.2V RSENSE
Input Undervoltage = 36.5V
(See "Functional Description" for more detail)
DC-DC Converter
IN+ OUT+
/ON/OFF
INâ OUTâ
+5VOUT
5V
RETURN
0.1µF 100µF
Micrel, Inc. ⢠1849 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel + 1 (408) 944-0800 ⢠fax + 1 (408) 944-0970 ⢠http://www.micrel.com
December 2003
1
M9999-122303
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