MIC2589 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS

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.
Features
• 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
Typical Application
–48V
RETURN
(Long Pin)
–48V
RETURN
(Short Pin)
R1
698kΩ
1%
R2
11.8kΩ
1%
R3
12.4kΩ
1%
14 _VDD
3 _UV
4 _OV
MIC2589-1BM
MIC2589R-1BM
PWRGD1 ¹
12
PWRGD2
PWRGD3 ¹³
PGTIMER ²
CFILTER ⁵
CNLD ⁶
VEE
7
SENSE GATE DRAIN
9
10
11
C_FILTER
C_PG
R4
0Ω
C_GATE
C_NLD
–48V
INPUT
(Long Pin)
M1
R_SENSE
100µF
DC-DC Converter
IN+ OUT
+2.5V
/ON/OFF
IN– GND
+2.5V
RETURN
100µF
DC-DC Converter
IN+ OUT
+3.3V
/ON/OFF
IN– GND
+3.3V
RETURN
DC-DC Converter
IN+ OUT
100µF
/ON/OFF
IN– GND
Input Overvoltage = 71.2V
Input Undervoltage = 36.5V
(See "Functional Description"ˇ for more detail)
+5V
+5V
RETURN
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2004
1
M9999-031504