LM5068
Negative Voltage Hot-Swap Controller
General Description
The LM5068 hot-swap controller provides intelligent con-
trol of power supply connections during the insertion and
removal of circuit cards powered by live system backplanes
The LM5068 provides both in-rush current control and
short-circuit protection functions, and limits power supply
transients in the backplane caused by the insertion of
additional circuit cards. The LM5068 controls the external
N-Channel MOSFET to provide programmable load current
limiting and circuit breaker functions using a single external
current sense resistor. The LM5068 issues a power good
(PWRGD) signal at the conclusion of a successful power-
on sequence. Input over-voltage or under-voltage fault
conditions will cancel the PWRGD indication.
The LM5068-1 and -2 indicate power good as an open-
drain active high PWRGD state. The LM5068-3 and -4
indicate power-good as an open-drain active low PWRGD
state. The LM5068-1 and -3 latch off after a fault condition
is detected while the LM5068-2 and -4 continuously re-try
at intervals set by a programmable timer.
The LM5068 is available in MSOP-8 package.
PRE
LIM
IN
Features
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ARY
In-rush current limiting for safe board insertion into
live backplanes
Fast response to over-current fault conditions with
active current limiting
Wide -10V to -100V input voltage range
Programmable Under-voltage and Over-voltage
shutdown protection with adjustable hysteresis
Programmable Multi-Function Timer for board
insertion de-bounce delay
Fault timer avoids nuisance trips caused by short
duration load transients
Active gate clamping during initial power application
Available in both latched fault and automatic retry
versions
Available with either active HIGH or active LOW
power good flag
Samples are available now; volume production is expected
in late January 2004.
For additional information, contact Don Ashley at
Donald.Ashley@nsc.com
漏 2003 National Semiconductor Corporation
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Evaluation Board
1
