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TLE42994V33 Datasheet(PDF) 15 Page - Infineon Technologies AG

Part # TLE42994V33
Description  Low Dropout Fixed Voltage Regulator
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE42994V33 Datasheet(HTML) 15 Page - Infineon Technologies AG

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TLE42994V33
Block Description and Electrical Characteristics
Data Sheet
15
Rev. 1.01, 2010-10-14
Reset Reaction Time:
The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset
reaction rime
t
rr considers the internal reaction time trr,int and the discharge time trr,d defined by the external delay
capacitor
C
D (see typical performance graph for details). Hence, the total reset reaction time becomes:
with
trr: reset reaction time
trr,int: internal reset reaction time
t
rr,d: reset discharge
Optional Reset Output Pull-Up Resistor
R
RO,ext:
The Reset Output RO is an open collector output with an integrated pull-up resistor. If needed, an external pull-up
resistor to the output Q can be added. In Table “Electrical Characteristics Reset Function” on Page 18 a
minimum value for the external resistor
R
RO,ext is given.
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, 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
V
RT,new is calculated as follows:
with
VRT,new: the desired new reset switching threshold
RADJ1, RADJ2: resistors of the external voltage divider
V
RADJ,th: reset adjust switching threshold given in Table “Electrical Characteristics Reset Function” on
Page 18
trr
trd int
,
trr d
,
+
=
VRT new
,
RADJ 1
,
R
+
ADJ 2
,
RADJ 2
,
------------------------------------------ V
RADJ th
,
×
=


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