TLE4470_08 Datasheet, PDF (15/24 Pages) Infineon Technologies AG – Dual Low-Drop Voltage Regulator Very low dropout

TLE 4470
V_Ι
V_Q
V_D
t _rd
t _rr
V_RO
t
< t _rr
V _{Q, rt}
dV
dt
=
Ι _D,c
C_D
t
V _DU
V _DL
t
Power-on-Reset
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage
Secondary Overload
Spike at Output
t
AED03010_4470
Figure 4 Reset Timing
Reset Switching Threshold
The internally set reset threshold is 4.65 V. When using the TLE 4470 G (PG-DSO-20)
this threshold can be adjusted to 3.5 V < V_{Q, rt} < 4.6 V by connecting an external voltage
divider to pin RADJ. If this pin is not needed, it can be left open or even better connected
to GND.
R₁ = R₂ × (V_{Q, rt} - V_ref) / V_ref or V_{Q, rt} = V_ref (1 + R₁ / R₂)
(5)
Definitions:
• V_{Q, rt} = Reset threshold
• V_ref = comparator reference voltage, typical 1.35 V
(Reset adjust input current ≈ 50 nA)
The reset output pin is internally connected to the stand-by output Q1 via a 30 kΩ pull-up
resistor. The reset LOW signal at pin RQ is guaranteed down to an output voltage V_Q1
of 1 V typical.
Data Sheet
15
Rev. 1.2, 2008-03-20