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MIC2589-2BM Datasheet(PDF) 1 Page - Micrel Semiconductor

Part # MIC2589-2BM
Description  SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2589-2BM Datasheet(HTML) 1 Page - Micrel Semiconductor

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March 2004
1
M9999-031504
MIC2589/2595
Micrel
MIC2589/MIC2595
Single-Channel, Negative High-Voltage Hot
Swap Power Controllers/Sequencers
General Description
The MIC2589 and MIC2595 are single-channel, negative-
voltage hot swap controllers designed to address the need for
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
family offers two responses to a circuit breaker fault condition:
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
operating range. These signals can be used to perform an all-
at-once or a sequenced enabling of one or more DC-DC
power modules.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Application
VDD
VEE
SENSE
GATE
DRAIN
CFILTER
UV
OV
10
9
7
4
3
14
11
5
MIC2589-1BM
MIC2589R-1BM
CNLD
6
PWRGD1
1
PWRGD2
12
PWRGD3
13
PGTIMER
2
CGATE
M1
R4
0
CPG
CFILTER
CNLD
–48V
INPUT
(Long Pin)
–48V
RETURN
(Short Pin)
–48V
RETURN
(Long Pin)
RSENSE
DC-DC Converter
100
µF
/ON/OFF
IN+
+3.3V
+3.3V
RETURN
IN–
OUT
GND
DC-DC Converter
100
µF
/ON/OFF
IN+
+5V
+5V
RETURN
IN–
OUT
GND
DC-DC Converter
100
µF
/ON/OFF
IN+
+2.5V
+2.5V
RETURN
IN–
OUT
GND
R3
12.4k
1%
Input Overvoltage = 71.2V
Input Undervoltage = 36.5V
(See "Functional Description"ˇ for more detail)
R2
11.8k
1%
R1
698k
1%
Features
• Provides safe insertion and removal from live
–48V (nominal) backplanes
• Operates from –19V to –80V
• Fast responding circuit breaker (<1
µs) 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
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com


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