LX7712 Datasheet | Microchip Technology

Description The LX7712 is a radiation-hardened-by-design power switch for integration into spacecraft power distribution systems as an electronic fuse for power line protection. DC supplies up to 120V with continuous current rating up to 5A can be easily turned on and off with slew rate programmability. The LX7712 includes a P-channel MOSFET power switch and catch diode for inductive loads. The LX7712 is configurable as either a latchable current limiter or a fold-back current limiter, with optional thermal shutdown. Multiple LX7712 devices can be paralleled to increase the current rating. The current limit, on/off slew rate, and fault response fault timers are programmed with passive external ponents. The latchable current limiter is configurable to either latch off (LCL) under fault conditions, or to attempt to restart in hiccup mode (RLCL). A fault time integrating function accumulates the thermal effects of short fault pulses. The fault timer is configurable for either a fixed duration or a duration that is a function of the voltage drop from line input to load output across the switch. A resistor programmable fault timer discharge function ensures that the LX7712 has dissipated excess energy to a safe level before restarting. In fold-back current limit (FCL) mode, the profile of the fold-back load current versus load voltage curve is resistor programmable. Fold-back allows automatic fault recovery. An overload condition forces the current limit to a safe trickle level, and when the overload is removed the current limit returns to its normal level. This prevents soft-short fault situations which can cause the switch to over-dissipate. A programmable current ramp function limits the slew rate of the current during turn on and turn off. The LX7712MFM is packaged in a 48-pin hermetic hybrid tub flatpack (HTF) package. It operates over a -55°C to 125°C temperature range and is radiation tolerant to a minimum of 100krad(Si) TID and a minimum of 50krad(Si) ELDRS, as...