Hot Swap Controller protects board during live insertion.
Share:
Press Release Summary:
Model LTC4244 CompactPCI(TM) Hot Swap(TM) Controller turns board's supply voltages on and off in controlled manner, allowing board to be safely inserted or removed from live CompactPCI connnector without glitching system power supplies. IC controls 5 and 3.3 V supply voltages with external N-channel FETS, while internal switches control ±12 V supplies. Absolute maximum supply voltage of 14.4 V provides extra protection against voltage spikes.
Original Press Release:
Hot Swap Controller for CompactPCI Systems Protects & Supports System Requirements During Live Insertion
MILPITAS, CA - November 10, 2003 - Linear Technology introduces the LTC4244, a rugged CompactPCI(TM) Hot Swap(TM) controller that turns a board's supply voltages on and off in a controlled manner. This allows the board to be safely inserted or removed from a live CompactPCI connector without glitching the system power supplies. The IC controls the 5V and 3.3V supply voltages with external N-channel FETS while internal switches control the ±12V supplies. An absolute maximum supply voltage of 14.4V gives users an extra degree of protection against voltage spikes, while undervoltage lockouts ensure that the part will only turn on once all the supplies are within proper operational limits.
The LTC4244 features circuit breakers with foldback current limiting that protect all four supplies and allow over-current transients to be limited without latching off. Voltage monitors on all supplies provide the HEALTHY# signal to indicate that the supplies are within regulation. These monitors, in combination with the PCI_RST# signal, in turn generate the LOCAL_PCI_RST# signal for the local processor. The part also pre-charges the bus I/O connector pins during hot insertion and extractions, thus limiting the possible disturbances.
All of the above features allow CompactPCI cards to manage the power supplies during card insertion and extraction, limiting potential disturbances. The LTC4244-1 eliminates undervoltage lockout on the -12V supply for those applications not implementing VEE.
The LTC4244 is specified for both the commercial and industrial temperature ranges and is offered in the 20-pin SSOP package. Pricing starts at $3.90 each in 1,000-piece quantities.
Summary of Features: LTC4244
Controls -12V, 3.3V, 5V and 12V Supplies
± 14V Absolute Maximum Rating for ± 12V inputs
Insensitive to Supply Voltage Transients
Adjustable Foldback Current Limit with Circuit Breaker
LOCAL_PCI_RST##CRLF# Logic On-Chip
PRECHARGE Output Biases I/O Pins During Card Insertion & Extraction
Narrow 20-Lead SSOP Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com
Note: LT, AND LTC are registered trademarks of Linear Technology Corp.
