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TLE4275V33 Datasheet(PDF) 7 Page - Infineon Technologies AG

Part # TLE4275V33
Description  Stable with ceramic output capacitor
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE4275V33 Datasheet(HTML) 7 Page - Infineon Technologies AG

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TLE 4275 V33
Block Description and Electrical Characteristics
Datasheet
7
Rev. 1.1, 2015-01-15
3.3
Reset Function
The reset function contains serveal features:
Output Undervoltage Reset:
An output undervoltage condition is indicated setting the Reset Output “RO” to low. This signal might be used to
reset a microcontroller during low supply voltage.
In case the battery voltage is already lower than the buffered output voltage
V
Q of the voltage regulator, the reset
circuit is supplied from the output “Q”, ensuring a defined reset switching threshold also at
V
I = 0 V. The Reset
Output “RO” is held “low” down to an output voltage of
V
Q = 1 V, even if the input voltage VI is 0 V.
Power-On Reset Delay Time:
The power-on reset delay time
t
d,PWR-ON allows a microcontoller and oscillator to start up. This delay time is the
time period from exceeding the reset switching threshold
V
RT until the reset is released by switching the reset
output “RO” from “low” to “high”. The power-on reset delay time
t
d,PWR-ON is defined by an external delay
capacitor
C
D connected to pin “D” which is charged up by the delay capacitor charge current ID,ch starting from
V
D = 0 V.
For easy calculating the power-on reset delay time, a multiplier factor
F
d,PWR-ON = td,PWR-ON / CD is specified.
Hence,
t
d,PWR-ON becomes:
t
d,PWR-ON = Fd,PWR-ON / CD .
(1)
For a precise calculation consider also the delay capacitor’s tolerance.
Undervoltage Reset Delay Time:
Unlike the power-on reset delay time, the undervoltage reset delay
t
d time considers a short output undervoltage
event where the delay capacitor
C
D is assumed to be discharged to VD = VDST,lo only before the charging sequence
restarts. Therefore, the undervoltage reset delay time
t
d is defined by the delay capacitor charge current ID,ch
starting from
V
D = VDST,lo and the external delay capacitor CD.
For easy calculating the undervoltage reset delay time, a multiplier factor
F
d = td / CD is specified. Hence, td
becomes:
t
d = Fd / CD .
(2)
For a precise calculation consider also the delay capacitor’s tolerance.
Reset Reaction Time:
The total reset reaction rime
t
rr,total 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 rime
becomes:
t
rr,total
=
t
rr,int + trr,d .
(3)
Reset Output “RO” Low for
V
Q 1V:
In case of an undervoltage reset condition reset output “RO” is held “low” for
V
Q ≥ 1 V, even if the input voltage VI
is 0 V. This is achieved by supplying the reset circuit from the output capacitor.


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