Want to post a buying lead? If you are not a member yet, please select the specific/related part number first and then fill the quantity and your contact details in the "Request for Quotation Form" on the left, and then click "Send RFQ".Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.
The L4943 contains a triple voltage regulator and a high side driver.
In stand-by the output is active as long as possible even when in thermal shutdown or under any other fault conditions.
The STCAP pin allows the use of a reserve supply capacitor that will hold enough energy for the 5V Stand-by line to allow the P to store data
L4943 Maximum Ratings
Symbol
Parameter
Value
Unit
VS
DC Operating Supply Voltage
-0.6to30
V
Transient Supply Overvoltage (50ms)
50
V
IO
Voltage Regulator Output Current
Internally limited
Vin
Input Voltage (EN1, EN2)
0to6
V
RSER
Output Capacitor Series Eq. Resistance
0.2to10
Ptot
Power Dissipation (Tcase = 85°C)
33
W
Top
Operating Temperature Range
-40to85
°C
Tstg
Storage Temperature Ranges
-55to150
°C
L4943 Features
·3 PROGRAMMABLE OUTPUTS: -3 TO 11V (500mA); -3 TO 11V (500mA); -3 TO 7V (500mA) STANDBY ·OUT1 AND OUT2 WITH INDEPENDENT ENABLE ·CONTROL FOR STAND-BY MODE ·0.4A HIGH SIDE DRIVER ·LOAD DUMP PROTECTION ·THERMAL SHUTDOWN
L4945 Parameters
Technical/Catalog Information
L4945
Vendor
STMicroelectronics
Category
Integrated Circuits (ICs)
Regulator Type
Single Output
Package / Case
TO-220-3 (Straight Leads)
Packaging
Tube
Regulator Topology
Positive Fixed
Current - Output
500mA
Voltage - Output
5V
Operating Temperature
-40°C ~ 125°C
Voltage - Input
6 ~ 26 V
Number of Regulators
1
Current - Limit (Min)
-
Current Short Circuit (Isc)
500mA
Lead Free Status
Lead Free
RoHS Status
RoHS Compliant
Other Names
L4945 L4945 497 3629 ND 4973629ND 497-3629
L4945 General 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 cranking 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.
L4945 Maximum Ratings
Symbol
Parameter
Value
Unit
Vi
DC Input Voltage DC Reverse Input Voltage Transient Input Overvoltages : Load Dump : 5ms trise 10ms tf Fall Time Constant = 100ms RSOURCE 0.5 Field Decay : 5ms tfall 10ms, RSOURCE10 tr Rise Time Constant = 33ms Low Energy Spike : trise = 1ms, tfall = 500ms, RSOURCE10 fr Repetition Frequency = 5Hz
35 -18 80
-80
± 100
V V V
V
V
TJ
Junction Temperature Range
40 to 150
°C
TOP
Operating Temperature Range
40 to 125
°C
Tstg
Storage Temperature Range
55 to 150
°C
L4945 Features
`5V ± 4% PRECISE OUTPUT VOLTAGE OVER FULL TEMPERATURE RANGE ( 40 / 125 °C) `VERY LOW VOLTAGE DROP (0.75Vmax) OVER FULL TEMPERATURE RANGE `OUTPUT CURRENT UP TO 500mA `OVERVOLTAGE AND REVERSE VOLTAGE PROTECTIONS `REVERSE VOLTAGEPROTECTION `SHORT CIRCUIT PROTECTION AND THERMAL SHUT-DOWN (with hysteresis) `LOW START UP CURRENT
L4947 Parameters
Technical/Catalog Information
L4947
Vendor
STMicroelectronics
Category
Integrated Circuits (ICs)
Regulator Type
Single Output
Package / Case
Pentawatt-5 (Vertical, Bent and Staggered Leads)
Packaging
Tube
Regulator Topology
Positive Fixed
Current - Output
500mA
Voltage - Output
5V
Operating Temperature
-40°C ~ 125°C
Voltage - Input
6 ~ 26 V
Number of Regulators
1
Current - Limit (Min)
-
Current Short Circuit (Isc)
500mA
Lead Free Status
Contains Lead
RoHS Status
RoHS Non-Compliant
Other Names
L4947 L4947 497 3918 5 ND 49739185ND 497-3918-5
L4947 General 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 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.
L4947 Maximum Ratings
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