SGS Thomson Microelectronics L4945 Datasheet
5V VERY LOW DROP VOLTAGE REGULATOR
5V ± 4%PRECISEOUTPUTVOLTAGE
OVER FULL TEMPERATURE RANGE
(– 40 / 125
VERY LOW VOLTAGE DROP (0.75Vmax)
OVER FULL TEMPERATURE RANGE
OUTPUTCURRENT UP TO 500mA
OVERVOLTAGE AND REVERSE VOLTAGE
PROTECTIONS
REVERSEVOLTAGEPROTECTION
SHORT CIRCUIT PROTECTION AND THER-
MAL SHUT-DOWN(with hysteresis)
LOW START UP CURRENT
DESCRIPTION
The L4945 is a monolithic integrated circuit in
Versawatt package specially designed to provide
a stabilized supply voltage for automotive and industrial electronic systems. Thanks to their very
low voltage drop, in automotive applications the
devices can work correctly even during the crank-
C)
°
L4945
TO220
ORDERING NUMBER: L4945
ing phase, when the battery voltage could fall as
low as 6V. Furthermore, they incorporate a complete range of protection circuits against the dangerous overvoltages always present on the battery rail of the car.
BLOCK DIAGRAM
This is advanced information on a new product now in development or undergoing evaluation.Details are subject tochange without notice.
March 1999
1/6
L4945
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
i
DC Input Voltage
DC Reverse Input Voltage
Transient Input Overvoltages :
Load Dump :
rise
≥ 0.5Ω
fall
=1µs, t
≤ 10ms
10ms, R
≤
= 500µs, R
fall
SOURCE
SOURCE
5ms ≤ t
Fall TimeConstant = 100ms
τ
f
R
SOURCE
Field Decay :
5ms≤t
Rise Time Constant = 33ms
τ
r
Low Energy Spike :
t
rise
Repetition Frequency = 5Hz
f
r
35
–18
80
–80
≥10Ω
±100
≥ 10Ω
V
V
V
V
V
T
J
T
OP
T
stg
Note: The circuitis ESD protectedaccording to MIL-STD-883C.
Junction Temperature Range – 40 to 150 °C
Operating Temperature Range – 40 to 125
Storage Temperature Range – 55 to 150 °C
PIN CONNECTION (Top view)
C
°
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-case Max 3 °C/W
2/6
R
th j-case
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