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                L4947
                L4947R
                5V-0.5A VERY LOW DROP REGULATOR WITH RESET
                PRECISE OUTPUT VOLTAGE (5V
                ±
                4%)
                OVER FULL TEMPERATURE RANGE
                (– 40 / 125
                °
                C)
                VERY LOW VOLTAGE DROP (0.75Vmax)
                OVER FULL T RANGE
                OUTPUT CURRENT UP TO 500mA
                RESET FUNCTION
                POWER-ON RESET DELAY PULSE DE-
                FINED BY THE EXTERNAL CAPACITOR
                + 80V LOAD DUMP PROTECTION
                – 80V LOAD DUMP PROTECTION
                REVERSE VOLTAGE PROTECTION
                SHORT CIRCUIT PROTECTION AND THER-
                MAL SHUT-DOWN (with hysteresis)
                LOW START UP CURRENT
                DESCRIPTION
                The L4947/L4947R is a monolithic integrated cir-
                cuit in Pentawatt package specially designed to
                provide a stabilized supply voltage for automotive
                and industrial electronic systems. Thanks to its
                very low voltage drop, in automotive applications
                the L4947/L4947R can work correctly even during
                the cranking phase, when the battery voltage
                could fall as low as 6V. Furthermore, it incorpo-
                rates a complete range of protection circuits
                against the dangerous overvoltages always pre-
                sent on the battery rail of the car. The reset func-
                tion makes the device particularly suited to supply
                microprocessor based systems : a signal is avail-
                able (after an externally programmable delay) to
                reset the microprocessor at power-on phase ; at
                power-off, this signal becomes low inhibiting the
                microprocessor.
                This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
                June 2000
                .
                BLOCK DIAGRAM
                Pentawatt
                ORDERING NUMBERS: L4947
                L4947R
                1/6
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