LM5068MM-2 Datasheet, PDF (1/33 Pages) Texas Instruments – LM5068 Negative Voltage Hot Swap Controller

LM5068
www.ti.com
SNVS254C – JANUARY 2004 – REVISED MARCH 2013
LM5068 Negative Voltage Hot Swap Controller
Check for Samples: LM5068
FEATURES
1
•2 Safe Module Insertion and Removal from Live
Backplanes
• In-Rush Current Limiting for Safe Board
Insertion into Live Backplanes
• Fast Response to Over-Current Fault
Conditions with Active Current Limiting
• -10V to -90V Input Range
• Programmable Under-Voltage/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
Re-Try Versions
• Available with either Active HIGH or Active
LOW Power Good Flag
APPLICATIONS
• - 48V Power Modules
• Central Office Switching
• Distributed Power Systems
• Electronic Circuit Breaker
• PBX Systems
• Negative Power Supply Control
DESCRIPTION
The LM5068 hot-swap controller provides intelligent
control 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 a VSSOP-8 package.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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