LM2926 Datasheet | National Semiconductor

Description The LM2926 is a 5V, 500 m A, low dropout regulator with delayed reset. The microprocessor reset flag is set low by thermal shutdown, short circuits, overvoltage conditions, dropout, and power-up. After the fault condition is corrected, the reset flag remains low for a delay time determined by the delay capacitor. Hysteresis is included in the reset circuit to prevent oscillations, and a reset output is guaranteed down to 3.2V supply input. A latching parator is used to discharge the delay capacitor, which guarantees a full reset pulse even when triggered by a relatively short fault condition. A patented quiescent current reduction circuit drops the ground pin current to 8 m A at full load when the input-output differential is 3V or more. Familiar PNP regulator features such as reverse battery protection, transient protection, and overvoltage shutdown are included in the LM2926 making it suitable for use in automotive and battery operated equipment. The LM2927 is electrically identical to the LM2926 but has a different pin-out. The LM2927 is pin-for-pin patible with the L4947 and TLE4260 alternatives. The LM2926 is pin-for-pin patible with the LM2925. Features n n n n n n n n 5% output accuracy over entire operating range Dropout voltage typically 350 m V at 500 m A output Externally programmed reset delay Short circuit proof Reverse battery proof Thermally protected LM2926 is pin-for-pin patible with the LM2925 P+ Product Enhancement tested Applications n Battery operated equipment n Microprocessor-based systems n Portable instruments Typical Application DS010759-1 - Required if regulator is located far ( > 2") from power supply filter. - - CO 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 msut be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is...