MIC2587(2013) Ver la hoja de datos (PDF) - Micrel
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MIC2587 Datasheet PDF : 22 Pages
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MIC2587/MIC2587R
Single-Channel, Positive High-Voltage
Hot Swap Controller
Revision 2.0
General Description
The MIC2587 and MIC2587R are single-channel positive
voltage hot swap controllers designed to provide safe
insertion and removal of boards for systems that require
live (always-powered) backplanes. These devices use few
external components and act as controllers for external N-
channel power MOSFET devices to provide inrush current
control and output voltage slew rate control. Overcurrent
fault protection is provided via programmable analog fold-
back current-limit circuitry equipped with a programmable
overcurrent filter. These protection circuits combine to limit
the power dissipation of the external MOSFET to ensure
that the MOSFET is in its SOA during fault conditions. The
MIC2587 provides a circuit breaker function that latches
the output MOSFET off if the load current exceeds the
current limit threshold for the duration of the programmable
timer. The MIC2587R provides a circuit breaker function
that automatically attempts to restart power after a load
current fault at a low duty cycle to prevent the MOSFET
from overheating. Each device provides either an active-
HIGH (−1YM) or an active-LOW (−2YM) “Power-is-Good”
signal to indicate that the output load voltage is within
tolerance of the application circuit’s design objective.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• MIC2587: Pin-for-pin functional equivalent to the
LT1641
• Operates from +10V to +80V with 100V ABS MAX
operation
• Programmable current limit with analog foldback
• Active current regulation minimizes inrush current
• Electronic circuit breaker for overcurrent fault protection:
− Output latch off (MIC2587)
− Output auto-retry (MIC2587R)
• Fast responding circuit breaker (< 1
loads
o ssh)otrt circuit
• Programmable input undervoltage lockout
• Open-drain “Power-is-Good” output for enabling DC/DC
converter(s):
− Active-HIGH: MIC2587-1/MIC2587R-1
− Active-LOW: MIC2587-2/MIC2587R-2
• Fault Reporting
Applications
• General-purpose hot board insertion
• High-voltage, high-side electronic circuit breaker
• +12V/+24V/+48V distributed power systems
• +24V/+48V industrial/alarm systems
• Telecom systems
• Medical systems
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 24, 2013
Revision 2.0
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