In automotive microcontroller or microprocessor power-supply applications, the watchdog
is used to monitor the microcontroller working status to prevent software runaway. It is necessary
for the watchdog to be independent of the microcontroller in a reliable system.
The TPS7B68xx-Q1 device is a family of 500-mA watchdog LDOs designed for an operating
voltage up to 40 V, with typical quiescent current of only 19 µA at light load. The devices
integrate a programmable function for selecting a window or standard watchdog, with an external
resistor to set the watchdog time within 9% accuracy.
The PG pin on the TPS7B68xx-Q1 devices indicate when the output voltage is stable and in
regulation. The power-good delay period and power-good threshold can be adjusted by external
components. The devices also feature an integrated short-circuit and overcurrent protection. The
combination of such features makes these devices particularly flexible and suitable to supply
microcontroller systems in automotive applications.
For all available packages, see the orderable addendum at the
end of the data sheet.
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