Analog Devices Debuts ADM1070 Hot-Swap Controllers

Analog Devices Inc. (Norwood, MA) announced its new ADM1070 family of hot-swap controllers, which enable safe board insertion and removal from a live –48V backplane, allowing boards to be re-seated without shutting the system down. The ADM1070 is suitable for a number of applications, including central office switching applications, power supply controls, circuit breakers, high-availability servers, –48V distributed power systems and hot board insertion.

The ADM1070 operates from a negative voltage of up to –80V, but can tolerate transient voltages of up to –200V. Key features of the ADM1070 include in-rush current control, over-current and short-circuit protection, and limited consecutive retry functions. The load current is monitored to ensure that it remains less than a level programmed by an external sense resistor. If the current exceeds this level, the gate drive to an external FET is modulated to reduce it. An auto-restart is attempted at a programmable time after the over-current event, while pulse-width modulation keeps the FET safe. Programmable time filtering allows transient faults to occur without shutting the system down. The ADM1070 includes single-pin under-voltage/over-voltage detection, and requires only five external components.

Fabricated using BiCMOS technology for minimal power consumption, the ADM1070 is packaged in a six-lead SOT23 package, which produces a 25-percent reduction in board space over an eight-lead SOIC solution.

The price per unit in 1,000-piece quantities is $1.70. Samples are available now, with production quantities available in June 2002.