Datasheet

TLE7272-2
Electrical Characteristics
Data Sheet 16 Rev. 1.0, 2009-06-01
5.5 Electrical Characteristics Reset Function
The Reset function informs e.g. the microcontroller in case the output voltage has fallen below the lower threshold
VRT of typ. 4.65 V. The headroom VRH between the output voltage and the reset threshold is typically 350 mV.
Connecting the regulator to a battery voltage at first the reset signal remains LOW. When the output voltage has
reached the reset threshold VRT the reset output RO remains still LOW for the reset delay time tRD (typ. 16 ms).
Afterwards the reset output turns HIGH.
Electrical Characteristics Reset
V
I
=13.5 V; – 40 °C < T
j
< 150 °C; all voltages with respect to ground (unless otherwise specified)
Pos.
Parameter Symbol Limit Values Unit Conditions
Min. Typ. Max.
5.5.1 Output Undervoltage Reset
Switching Threshold
V
RT
4.50 4.65 4.80 V V
Q
decreasing
V
I
= 6V
5.5.2 Output Undervoltage Reset
Headroom
V
RH
–350–mV–
5.5.3 Reset Output Low Level Voltage
V
ROL
–0.20.4VR
RO
=10kΩ;
V
Q
> 1 V
5.5.4 Integrated Reset Pull Up Resistor
R
RO
15 30 45 kΩ –
5.5.5 Optional External Reset Pull Up
Resistor
R
RO,ext
10 – – kΩ –
5.5.6 Power On Reset Delay Time
t
RD
10 16 22 ms –
5.5.7 Reset Reaction Time
t
RR
––12µs–