Features • 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 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. Applications • - 48V Power Modules • Central Office Switching • Distributed Power Systems • Electronic Circuit Breaker • PBX Systems • Negative Power Supply Control

Also Recommended LM25061▲ Output Monitor/Adjustable PGD, +2.9V To +17V Version LM25069▲ +2.9V To +17V Version LM5067▲ UPGRADE To Include Power Limiting LM5069▲ +9V To +80V Version, Includes Power Limiting MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image

Datasheet

Title		Size	Date	Other Language
	LM5068 Negative Voltage Hot Swap Controller	1186 Kbytes	1-Dec-04

Featured Application Notes

Title		Size	Date	Other Language
	AN-1326: Application Note 1326 LM5068 Evaluation Board	155 Kbytes	15-Apr-04
	AN-1304: Application Note 1304 LM5068 -48V Hot Swap Controller	61 Kbytes	26-Jan-04	中文

More Application Notes

Title		Size	Date	Other Language
	AN-2000: Application Note 2000 LM5060EVAL Evaluation Board	1654 Kbytes	3-Nov-09
	AN-1723: Application Note 1723 LM5067 Evaluation Board	747 Kbytes	30-Sep-07
	AN-1522: Application Note 1522 LM5069 Evaluation Board	1436 Kbytes	7-Mar-08	中文

Design Tools

Title	Size	Date
Article - Power Limits Make Hot Swapping More Robust
Article - Hot-Swap Switch Provides Easy Thermal Protection

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5068MM-1	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MM-2	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MM-3	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MM-4	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MMX-1	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MMX-2	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MMX-3	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5068MMX-4	ABCD150XV1	0	3868	0	0	2595000	2	736338335

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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