TLE42694_14 Datasheet, PDF (19/33 Pages) Infineon Technologies AG – Low Dropout Fixed Voltage Regulator

TLE42694
Block Description and Electrical Characteristics
Reset Adjust Function
The undervoltage reset switching threshold can be adjusted according to the application’s needs by connecting
an external voltage divider (R_ADJ1, R_ADJ2) at pin R_ADJ. For selecting the default threshold connect pin R_ADJ to GND.
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 reset switching threshold V_RT,new is calculated as follows:
(3)
V_{RT, new}
=
R-----_{A---D----J--,--1----}+_{-----R----A----D----J--,--2-}
R_{ADJ, 2}
×
V_{R A D J,}
th
with
• V_RT,new: the desired new reset switching threshold
• R_ADJ1, R_ADJ2: resistors of the external voltage divider
• V_RADJ,th: reset adjust switching threshold given in Table 9 “Electrical Characteristics Reset Function” on
Page 20
Supply _I
Co n tr o l
In t.
Supply
V_RADJ,th
OR
GND
BlockDiagram_ResetAdjust.vsd
Figure 6 Block Diagram Reset Function
I_D,ch
I_D,dch
V_DST
Q
R_RO
RO
C_Q
I _RO
VDD
R_RO,ext
Re se t
R_ADJ,1
M ic ro-
Cont rolle r
D
C_D
RADJ
I _RADJ
R_ADJ,2
GND
Data Sheet
19
Rev. 1.3, 2014-07-03