TLE42764_11 Datasheet, PDF (14/20 Pages) Infineon Technologies AG – Low Dropout Linear Voltage Regulator

TLE42764
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.
Input
e.g. KL 15
I1
5Q
Output
C_I
TLE42764
C_Q
R
*)
1
EN ₂
3
4 ^*)
VA
Voltage
GND
Adjust
R
*)
2
*) _{Optional for adjustable Voltage Regulator}
AES02046
Figure 4 Application Diagram
A typical application circuit of the TLE42764 is shown in Figure 4. It shows a generic configuration of the voltage
regulator, with the recommendable minimum number of components one should use. Theoretically, if there is no
risk of high frequency noise at all, even the small input filter capacitor can be omitted. For a normal operation mode
of the device the only required device is the output capacitor, for the TLE42764GV and the TLE42764DV
additionally the resistor divider. However, depending on the application’s environment, additional components like
an input buffer capacitor or a reverse polarity protection diode can be considered as well.
Input Filter Capacitor
A small ceramic capacitor (e.g. 100nF in Figure 4) at the device’s input helps filtering high frequency noise. To
reach the best filter effect, this capacitor should be placed as close as possible to the device’s input pin. The input
filter capacitor does not have an influence on the stability of the device’s regulation loop.
Output Capacitor C_Q
The output capacitor is the only external component that is required in any case as it is a part of the device’s
regulating loop. To maintain stability of this loop, the TLE42764 requires an output capacitor respecting the values
given in “Functional Range” on Page 7.
Adjusting the Output Voltage of Variable Output Regulators TLE42764GV, TLE42764DV
The output voltage of the TLE42764GV and the TLE42764DV can be adjusted between 2.5 V and 20 V by an
external resistor divider, connected to the voltage adjust pin VA.
The pin VA is connected to the error amplifier comparing the voltage at this pin with the internal reference voltage
of typically 2.5 V.
Data Sheet
14
Rev. 1.2, 2011-02-15