TLE4699 INFINEON [Infineon Technologies AG], TLE4699 Datasheet - Page 21

• Manufacturer Part Number: TLE4699
• Description: Low Drop Out Linear Voltage Regulator 5 V Fixed Output Voltage
• Manufacturer: INFINEON [Infineon Technologies AG]

Reset Reaction Time
In case the output voltage of the regulator drops below the output undervoltage lower reset threshold
delay capacitor
threshold
Additionally to the delay capacitor discharge time
time
with
•
•
•
Reset Output “RO”
The reset output “RO” is an open collector output with an integrated pull-up resistor. In case a lower-ohmic “RO”
signal is desired, an external pull-up resistor to the output “Q” can be connected. Since the maximum “RO” sink
current is limited, the optional external resistor
Reset Output “RO” Low for
In case of an undervoltage reset condition reset output “RO” is held “low” for
is 0 V. This is achieved by supplying the reset circuit from the output capacitor.
Reset Adjust Function
The undervoltage reset switching threshold can be adjusted according to the application’s needs by connecting
an external voltage divider (
GND. The reset adjustment range is given in
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
with
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•
•
Data Sheet
t
V
rr,total
RT,new
t
t
t
typical performance graphs.
V
R
V
rr,total
rr,int
rr,d
t
RT,new
ADJ,1
RADJ,th
rr,total
: Delay capacitor discharge time. For a capacitor
: Internal reset reaction time; see
=
: total reset reaction time
,
V
: Desired reset switching threshold.
R
becomes:
=
: Reset adjust switching threshold given in
t
DST,lo
rr,int
ADJ,2
V
C
RADJ,th
, the reset output RO will be set to “low”.
: Resistors of the external voltage divider, see
+
D
t
is discharged rapidly. Once the delay capacitor’s voltage has reached the lower delay switching
rr,d
×
R
---------------------------------------- -
ADJ 1 ,
R
ADJ1
V
R
Q
ADJ 2 ,
,
≥ 1 V
R
+
ADJ2
R
ADJ 2 ,
) at pin “RADJ”. For selecting the default threshold connect pin “RADJ” to
Item 8.2.16
Item
R
RO,ext
t
rr,d
8.2.6.
Item
an internal time
must not below as specified in
21
C
D
8.2.5.
different from the value specified in
Figure
V
RT,new
t
7.
rr,int
is calculated as follows
applies. Hence the total reset reaction
V
Q
≥ 1 V, even if the input voltage
Item
8.2.8.
Rev. 1.0, 2010-11-30
Item
Reset Function
8.2.17, see
TLE4699
V
RT,lo
, the
V
I