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Q67000-A9407 Datasheet(PDF) 2 Page - Infineon Technologies AG |
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Q67000-A9407 Datasheet(HTML) 2 Page - Infineon Technologies AG |
2 / 18 page TLE 4290 Data Sheet Rev. 1.4 2 2001-10-18 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to an output voltage V Q to 1 V. A LOW signal at the Power Good pin informs that the battery was lost and memory is no longer valid.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. Figure 1 Block Diagram AEB02823 Current and Saturation Control Band- Gap- Reference TLE 4290 Power Good Control PG Q I D GND 15 2 4 |
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