LM2926

LM2926/LM2927 Low Dropout Regulator with Delayed Reset April 1998 LM2926/LM2927 Low Dropout Regulator with Delayed Reset General Description The LM2926 is a 5V, 500 mA, 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 comparator 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 mA 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 compatible with the L4947 and TLE4260 alternatives. The LM2926 is pin-for-pin compatible with the LM2925. Features n n n n n n n n 5% output accuracy over entire operating range Dropout voltage typically 350 mV at 500 mA output Externally programmed reset delay Short circuit proof Reve...