L4947R Datasheet PDF | STMicroelectronics

STMicroelectronics L4947R

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. 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 becomes low inhibiting the microprocessor. This is advanced information on a new product now in development or undergoing evaluation.

Part No.	L4947R
Datasheet	L4947R Download
Manufacturer	STMicroelectronics
Description	5V-0.5A VERY LOW DROP REGULATOR WITH RESET
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DESCRIPTION

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 complete range of protection circuits against the dangerous overvoltages always present on the battery rail of the car. 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 V V VR TJ, Tstg 35 – 55 to 150 V °C Note: The circuit is ESD protected according to MIL-STD-883C.