TLE4699 Datasheet, PDF (26/31 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator 5 V Fixed Output Voltage

TLE4699
Early Warning Function
Early Warning Resistor Divider Adjust
The switching threshold can be set to the application’s needs by connecting an external voltage divider (R_SI,1, R_SI,2)
at pin “SI”. If the Early Warning function is not needed, it is recommend to connect the SI pin to the output voltage
pin Q.
When dimensioning the voltage divider, take into consideration that there will be an additional current constantly
flowing through the resistors.
With a voltage divider connected, the upper switching threshold for the monitored voltage V_MON,high is calculated
as follows
V_MON,high
=
V_SI,high
×
R-----_{S---I-,--1----+-----R----S---I-,---2}
R_{SI, 2}
with
• V_MON,high: Desired reset switching threshold.
• R_SI,1, R_SI,2: Resistors of the external voltage divider, see Figure 9.
• V_SI,high: Sense threshold high given in Item 9.2.1.The lower switching threshold for the monitored voltage
V_MON,low is calculated as follows
V_MON,low
=
V_SI,low
×
R-----_{S---I-,--1----+-----R----S---I-,---2}
R_{SI, 2}
with
• V_mon,high: Desired reset switching threshold.
• R_SI,1, R_SI,2: Resistors of the external voltage divider, see Figure 9.
• V_SI,high: Reset adjust switching threshold given in Item 9.2.2.
Sense Output “SO”
The sense output “SO” is an open collector output with an integrated pull-up resistor. In case a lower-ohmic “SO”
signal is desired, an external pull-up resistor to the output “Q” can be connected.
Data Sheet
26
Rev. 1.0, 2010-11-30