TLE4470 Datasheet, PDF (15/22 Pages) Siemens Semiconductor Group – Dual Low-Drop Voltage Regulator

TLE 4470
V_Ι
V _RT
V_Q
V_D
t_d
t _RR
< t _RR
dV
dt
=
Ι_d
C_D
V_DT
V_ST
V _RO
Power-on-Reset
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage Secondary Overload
Spike at Output
AED01542
Figure 4
Reset Timing
Reset Switching Threshold
The internally set reset threshold is 4.65 V. When using the TLE 4470 G (P-DSO-20-6)
this threshold can be adjusted to 3.5 V < V_RTH < 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.
Definitions:
R₁ = R₂ × (V_RT – V_ref) / V_ref
V_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 in guaranteed down to an output voltage V_Q1 of
1 V typical.
Semiconductor Group
15
1998-11-01