LM2984 Datasheet | National Semiconductor

LM2984 Microprocessor Power Supply System April 1998 LM2984 Microprocessor Power Supply System General Description The LM2984 positive voltage regulator Features three independent and tracking outputs capable of delivering the power for logic circuits, peripheral sensors and standby memory in a typical microprocessor system. The LM2984 includes circuitry which monitors both its own high-current output and also an external µP. If any error conditions are sensed in either, a reset error flag is set and maintained until the malfunction terminates. Since these functions are included in the same package with the three regulators, a great saving in board space can be realized in the typical microprocessor system. The LM2984 also Features very low dropout voltages on each of its three regulator outputs (0.6V at the rated output current). Furthermore, the quiescent current can be reduced to 1 m A in the standby mode. Designed also for vehicular applications, the LM2984 and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. Familiar regulator Features such as short circuit and thermal overload protection are also provided. Fixed outputs of 5V are available in the plastic TO-220 power package. Features n n n n n n n n n n n n n n Three low dropout tracking regulators Output current in excess of 500 m A Fully specified for - 40˚C to +125˚C operation Low quiescent current standby regulator Microprocessor malfunction RESET flag Delayed RESET on power-up Accurate pretrimmed 5V outputs Reverse battery protection Overvoltage protection Reverse transient protection Short circuit protection Internal thermal overload protection ON/OFF switch for high current outputs P+ Product Enhancement tested Typical Application Circuit DS011252-1 COUT must be at least 10 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor must be rated over the...