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L9777B Datasheet(PDF) 11 Page - STMicroelectronics |
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L9777B Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 25 page L9777 Functional description Doc ID 13496 Rev 2 11/25 3 Functional description 3.1 Voltage regulator This device supply an always active 5 V regulated voltage on pin VCC with a current capability up to 200 mA. VCC voltage has an accuracy of 2% over a wide supply voltage (VI = 5.6 V to 31 V) and temperature range (TJ = -40 °C to 150 °C). A short circuit protection to GND is provided (see Figure 6). By means of tracking regulator, it is available a second output regulated voltage on pin VDD with a current capability up to 50mA. This regulated output is switchable on/off by external pin VDD_EN. Figure 6. VCC versus output current IVCC 3.2 Reset The reset circuit monitors the output voltage VCC. In case of internal reset threshold, if the output voltage stays lower than VCCUN for a filter time TRR, then NMI goes low. This filter time depends on the distance between the VCC output and the under voltage reset threshold (VCCUN): this solution increases the noise immunity of the voltage regulator be-cause the filter time between the reset event and the falling of NMI output changes according to the depth of spike on output voltage (see following picture). A minimum filter time of 1 µs (TRR1) is guaranteed if VCC goes down to 2.5 V and VS > 5.6 V. Figure 7. Filter time between VCC and NMI Otherwise, in case of external reset threshold fixed by means of external resistor divider on pin RADJ, there is only a constant filter time (TRRADJ) of 1 µs min value. VCC VCCREF IVCC ISHORT ILIM VCC NMI TRR1 VCC NMI V1 TRR2 VCCUN 2.5V |
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