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 DEFINED BY THE EXTERNAL CAPACITOR + 80V LOAD DUMP PROTECTION – 80V LOAD DUMP PROTECTION REVERSE VOLTAGE PROTECTION SHORT CIRCUIT PROTECTION AND THERMAL SHUT-DOWN (with hysteresis) LOW START UP CURRENT DESCRIPTION The L4947PD is a monolithic integrated circuit in HiPSO 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 L4947PD can work correctly even during the cranking phase, when the battery voltage could
PowerSO20 ORDERING NUMBER: L4947PD
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 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.
BLOCK DIAGRAM
PNP OUTPUT TRANSISTOR
INPUT 17
OUTPUT 3 ANTI SAT.
DUMP PROTECT.
START
REF. ERROR AMP.
THERMAL PROTECTION
OUTPUT CURRENT LIMITER
RESET OUTPUT 19
RESET CIRCUIT
GROUND This 1-20 is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without 1-20 notice. 2
June 2000
DELAY CAPACITOR
D94AT106
1/6
L4947PD ABSOLUTE MAXIMUM RATINGS Symbol Vi
VR TJ, Tstg
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
Value
Unit
35 – 18 80
V V V
– 80
V
± 100
V
35
V
– 55 to 150
°C
Value
Unit
3
°C/W
Reset Output Voltage Junction and Storage Temperature Range
Note: The circuit is ESD protected according to MIL-STD-883C.
The LM2926 is a 5V, 500 mA, low dropout regulator with de- layed reset. ... Typical Application ... May be increased without bound to maintain regulation during transients. Locate as ... (Limit). REGULATOR OUTPUT. Output Voltage. 5 mA ⤠IO ⤠500
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Turn T handle adjusting screw clockwise to increase vacuum or pressure, or counter clockwise to decrease vacuum or pressure. When decreasing vacuum or ...
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