LM5068_14 Datasheet, PDF (1/30 Pages) Texas Instruments – Negative Voltage Hot Swap Controller

LM5068
www.ti.com
SNVS254B – MAY 2004 – REVISED DECEMBER 2004
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 MSOP-8 package.
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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.
Copyright © 2004, Texas Instruments Incorporated