L4947R

Number of Outputs : 1
Maximum Operating Temperature : + 125 C
Output Voltage : 5 V
Output Type : Fixed
Mounting Style : Through Hole
Output Current : 500 mA
Input Voltage MAX : 26 V
Load Regulation : 60 mV
Dropout Voltage (Max) : 0.55 V at 500 mA
Package / Case : Pentawatt


Specifications

Symbol	Parameter	Value	Unit
Vi	DC Input Voltage DC Reverse Input Voltage Transient Input Overvoltages : Load Dump : 5ms 3 trise 3 10ms tf Fall Time Constant = 100ms RSOURCE . 0.5W Field Decay : 5ms 3 tfall 3 10ms, RSOURCE . 10W tr Rise Time Constant = 33ms Low Energy Spike : trise = 1ms, tfall = 500ms, RSOURCE . 10W fr Repetition Frequency = 5Hz	35 18 80 80 ± 100	V V V V V
VR	Reset Output Voltage	35	V
TJ, Tstg	Junction and Storage Temperature Range	55 to 150	°C

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/L4947Rcan work correctly even during the cranking phase, when the battery voltage 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. The reset function makes L4947R /L4947 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.