MIC2587/MIC2587R
Single-Channel, Positive High-Voltage
Hot Swap Controller
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
foldback current limit circuitry equipped with a
programmable overcurrent filter. These protection circuits
combine to limit the power dissipation of the external
MOSFET to insure 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 (-1BM) or an active-LOW
(-2BM) “Power-is-Good” signal to indicate that the output
load voltage is within tolerance.
Data sheets and support documentation can be found on
Micrel’s web site at
Features
•
MIC2587: Pin-for-pin functional equivalent to the LT1641
•
Operates from +10V to +80V with 100V ABS MAX operation
•
Industrial temperature specifications at V
CC
= +24V and
V
CC
= +48V
•
Programmable current limit with analog foldback
•
Active current regulation minimizes inrush current
•
Electronic circuit breaker for overcurrent fault protection
-
Output latch off (MIC2587) or
-
Output auto-retry (MIC2587R)
•
Fast responding circuit breaker (< 2µs) to short circuit loads
•
Programmable input undervoltage lockout
•
Fault Reporting:
Open-drain “Power-is-Good” output for enabling DC/DC
converter(s)
-
Active-HIGH:
MIC2587-1/MIC2587R-1
-
Active-LOW:
MIC2587-2/MIC2587R-2
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
Ordering Information
Part Number
Standard
MIC2587-1BM
MIC2587-2BM
MIC2587R-1BM
MIC2587R-2BM
Pb-Free
MIC2587-1YM
MIC2587-2YM
MIC2587R-1YM
MIC2587R-2YM
Active-HIGH
Active-LOW
Active- HIGH
Active-LOW
Latched
Latched
Auto-retry
Auto-retry
8 pin SOIC
8 pin SOIC
8 pin SOIC
8 pin SOIC
PWRGD Polarity
Circuit Breaker Function
Package
Power, Connect, and Protect is a trademark of Micrel Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax +1 (408) 474-1000 • http://www.micrel.com
October 2004
M9999-102204
(408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
