New Industry Products

National Semi Intros LM5068 Hot-Swap Controller

December 02, 2003 by Jeff Shepard

National Semiconductor Corp. (Santa Clara, CA) unveiled its new LM5068 -48V, hot-swap controller that delivers board area savings and long-term system reliability for communication systems. The device integrates a 100V bias regulator with an active-current control loop, start and fault timers, and under-voltage/over-voltage protection for board insertion into live –48V backplanes.

The LM5068 provides control of the power supply during insertion and removal of modules into a live –48V backplane. It can also be attached directly to a –48V bus. The programmable under-voltage and over-voltage comparators set the operating input-voltage range with input transient capability to 100V. The operating range provides reliable power distribution and hot-swap control in communications and networking equipment, high-availability servers, -48V distributed power systems, and central office switches.

The LM5068 provides trimmed and guaranteed 2% under-voltage and over-voltage thresholds plus a programmable under-voltage/over-voltage threshold hysteresis. The threshold voltages are programmed by the ratio of an external resistor divider connected between the 48V supply rails and the LM5068 comparator inputs. Under-voltage/over-voltage hysteresis is generated by trimmed 20mA current sources that are switched into the external under-voltage/over-voltage resistor divider when a start/stop threshold is achieved.

Sampling now, the LM5068 is housed in a MSOP-8 package and is priced at $1.35 each in 1,000-piece quantities. Volume production is expected in late January 2004.