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TLE42644 Datasheet(PDF) 10 Page - Infineon Technologies AG

Part # TLE42644
Description  Very Low Dropout Voltage
Download  15 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE42644 Datasheet(HTML) 10 Page - Infineon Technologies AG

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Data Sheet
10
Rev. 1.1, 2014-07-03
TLE42644
Application Information
6
Application Information
Note: The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
6.1
Application Diagram
Figure 3
Application Diagram
6.2
Selection of External Components
6.2.1
Input Pin
The typical input circuitry for a linear voltage regulator is shown in the application diagram above.
A ceramic capacitor at the input, in the range of 100 nF to 470 nF, is recommended to filter out the high frequency
disturbances imposed by the line e.g. ISO pulses 3a/b. This capacitor must be placed very close to the input pin
of the linear voltage regulator on the PCB.
An aluminum electrolytic capacitor in the range of 10 µF to 470 µF is recommended as an input buffer to smooth
out high energy pulses, such as ISO pulse 2a. This capacitor should be placed close to the input pin of the linear
voltage regulator on the PCB.
An overvoltage suppressor diode can be used to further suppress any high voltage beyond the maximum rating
of the linear voltage regulator and protect the device against any damage due to over-voltage.
The external components at the input are not mandatory for the operation of the voltage regulator, but they are
recommended in case of possible external disturbances.
6.2.2
Output Pin
An output capacitor is mandatory for the stability of linear voltage regulators.
The requirement to the output capacitor is given in “Functional Range” on Page 5. The graph “Region Of
Stability: Output Capacitor’s ESR ESR(CQ) versus Output Current IQ” on Page 9 shows the stable operation
range of the device.
Supply
100nF
10µF
CI1
CI2
Regulated
Output Voltage
IQ
CQ
<45V
DI
Load
(e.g.
Micro
Controller)
GND
II
10µF
(ESR<2Ω)
Bandgap
Reference
GND
Q
I
Temperature
Shutdown
Current
Limitation


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