NCP305LSQ22T1

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NCP305LSQ22T1 Application Field and Working Principle

NCP305LSQ22T1 is one type of PMIC – Supervisors on the market, composed of a voltage reference, a comparator, an oscillator, and an output circuit, which applies to a range of implementations. This article focuses on the application field and working principle of the NCP305LSQ22T1.

Application Field

NCP305LSQ22T1 is a low- power voltage supervisor, utilized in battery-powered equipment. It also works perfectly in any system which demands regular supervision of an externally supplied voltage or the output voltage of a voltage regulator. It protects microcontroller from a possible input voltage loss or drop-out. The NCP305LSQ22T1 is usually applied in those situations where a manual restart of the system is needed, for instance, resetting a microcontroller for troubleshooting and updating.

Working Principle

The NCP305LSQ22T1 is a four components device, consisting of a voltage reference, a comparator, an oscillator, and an output circuit. The voltage reference provides a stable output voltage for the comparator to compare it with the input voltage. The two keywords are compared and the voltage difference is reported to the comparator. When the input voltage is lower than the voltage reference, the oscillator is enabled and a pulse waveform output is generated that are used to drive external circuitry. In order to solve the potential problems caused by sudden power supply fluctuation, a reset out capacitance is connected in parallel with the Schmitt comparison circuit, which works as a filter and allows a minimum voltage variation to be tolerated.

Generally speaking, the NCP305LSQ22T1 is always configured to the opposite of the active-high mode. This implies that, when the input voltage is above the reference voltage, the RESET output is usually in High State, and when the input voltage drops below the reference voltage, the RESET will move to Low State. The active-high mode means that the RESET output is usually in Low State and goes to High State when the input level is lower than the reference voltage.

Conclusion

NCP305LSQ22T1 is a common PMIC – Supervisors on the market. It is utilized in battery-powered equipment and any system which demands regular supervision of an externally supplied voltage or the output voltage of a voltage regulator. The NCP305LSQ22T1 includes a voltage reference, a comparator, an oscillator, and an output circuit. It is configured to the opposite of the active-high mode, which means when the input voltage is above the threshold, the RESET output is usually in High State; when the input voltage drops below the threshold, the RESET will move to Low State.

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