Datasheet

16

Rev. 1.0

2023-07-11

OPTIREG™ linear TLE4263-2GS

5 V low drop voltage regulator

Application information

5.3

Reset adjust function

The undervoltage reset switching threshold can be adjusted according to the application’s needs by

connecting an external voltage divider (RADJ1, RADJ2) at pin RADJ. For selecting the default threshold connect

pin RADJ 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 VRT,new is calculated as follows:

(5.2)

with

• VRT,new: the desired new reset switching threshold

• RADJ1, RADJ2: resistors of the external voltage divider

• VRADJ,th: reset adjust switching threshold given in “Reset Generator” on Page 9

5.4

Watchdog

Figure 5

Timing of the watchdog function reset

VRT new

,

RADJ 1

,

R

+

ADJ 2

,

RADJ 2

,

------------------------------------------ V

RADJ th

,

×

=

V

W

t

V

RO

TimingDiagram_Watchdog.vsd

t

V

RO,l

T

WD,L

T

WI,tr

V

DWL

V

DU

t

V

D

T

WD,L

T

WI,p

No positive

V

W edge