TLE4290 Datasheet, PDF (2/18 Pages) Infineon Technologies AG – 5-V Low-Drop Voltage Regulator

TLE 4290
Power Good
The Power Good PG pin informs e.g. the microcontroller in case the output voltage has
fallen below the lower threshold V_Q,pgt-d of typ. 3.65 V. Connecting the regulator to a
battery voltage at first the power good signal remains LOW. When the output voltage has
reached the higher threshold V_Q,pgt-i the power good output remains still LOW for the
power good delay time t_rd. Afterwards the power good output turns HIGH. The delay time
can be set by the user with an external capacitor at pin D according to the requirements
of the application.
The Power Good circuitry supervises the output voltage. In case V_Q falls below the lower
Power Good switching threshold V_Q,pgt-d the PG output is set LOW after the Power Good
reaction time. The Power Good LOW signal is generated down to an output voltage V_Q
to 1 V. A LOW signal at the Power Good pin informs that the battery was lost and
memory is no longer valid.
The feature should be used in combination with a microcontroller with internal reset.
TLE 4290
I¹
5
Q
Band-
Gap-
Reference
Current
and
Saturation
Control
GND
Figure 1 Block Diagram
Power
Good
Control
2
PG
4
D
AEB02823
Data Sheet Rev. 1.4
2
2001-10-18