L4947R Datasheet | STMicroelectronics

DESCRIPTION The L4947/L4947R is a monolithic integrated circuit 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 BLOCK DIAGRAM Pentawatt ORDERING NUMBERS: L4947 L4947R could fall as low as 6V. Furthermore, it incorporates a plete range of protection circuits against the dangerous overvoltages always present on the battery rail of the car. The reset function makes the device particularly suited to supply microprocessor based systems : a signal is available (after an externally programmable delay) to reset the microprocessor at power-on phase ; at power-off, this signal bees 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 1/6 L4947 - L4947R ABSOLUTE MAXIMUM RATINGS Symbol Vi Parameter DC Input Voltage DC Reverse Input Voltage Transient Input Overvoltages : Load Dump : 5ms ≤ trise ≤ 10ms τf Fall Time Constant = 100ms RSOURCE ≥ 0.5Ω Field Decay : 5ms ≤ tfall ≤ 10ms, RSOURCE ≥ 10Ω τr Rise Time Constant = 33ms Low Energy Spike : trise = 1µs, tfall = 500µs, RSOURCE ≥ 10Ω fr Repetition Frequency = 5Hz Reset Output Voltage Junction and Storage Temperature Range Value 35 - 18 80 Unit V V V - 80 ± 100 VR TJ, Tstg - 55 to 150 V °C Note: The circuit is ESD protected according to MIL-STD-883C. PIN CONNECTION (Top view) THERMAL DATA Symbol R th j-case Parameter Thermal Resistance Junction-case Max Value 3.5 Unit °C/W TEST CIRCUIT (- ) Min. 20µF, ESR < 10Ω over full temperature range RP (pull up resistor) and RL (load) are both equal to 1KΩ. 2/6 L4947 - L4947R ELECTRICAL CHARACTERISTICS (refer to the test circuit, Vi = 14. 4V, Co = 47µF, ESR < 10Ω, Rp = 1KΩ, RL = 1KΩ, - 40°C ≤ TJ ≤ 125°C,...