NCP300LSN28T1

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NCP300LSN28T1 Application Field and Working Principle

PMIC - Supervisors are electronic components used to provide power-on management, short circuit protection, voltage monitoring, and clock distribution. The NCP300LSN28T1 is a low-dropout, high-precision supervisory IC from ON Semiconductor. It operates from a single 2.7 V to 5.5 V supply and is designed for battery-power applications.

Application Field

The NCP300LSN28T1 is a low-dropout supervisory device with a wide range of safety features including an adjustable overvoltage detection error flag, overvoltage reset flag, power-on reset flag and low-voltage reset flag. It also features a push-pull output, a programmable reset timeout, adjustable reset output pull-up current, and power-on reset output polarity control.

As the name implies, the NCP300LSN28T1 is used to “supervise” power supply voltages. It monitors the power supply voltage and quickly removes power from the system if the voltage drops too low or rises too high. It also provides a power-on reset signal to the microcontroller or ASIC. This reset signal is asserted when the power supply voltage is above a programmed threshold and ensures that the microcontroller or ASIC starts in a known state.

The NCP300LSN28T1 is ideal for a variety of different battery-powered applications. It can be used in motor controllers, industrial, consumer electronics, and much more. The device is also used in automotive and transportation applications such as those that require ignition detection.

Working Principle

The NCP300LSN28T1 is based on an operational amplifier configuration with an error detector connected between the PWR pin and an adjustable reference voltage. When the voltage applied to the PWR pin is higher than the reference voltage, the hysteresis action of the error detector prevents the NRST pin from being driven low. When the voltage applied to the PWR pin falls below the reference voltage, the error detector will force the NRST pin to a low level.

The NCP300LSN28T1 features an adjustable threshold voltage and an adjustable time delay time. The delay time is the time it takes from the moment the voltage on the PWR pin falls below the threshold voltage until the reset signal is asserted on the NRST pin. This time is adjustable from 0.2 ms up to 25 ms, allowing for a wide range of different reset signalling timing and power-on reset conditions.

The threshold voltage is adjustable through an external resistor divider and is typically set at 2.9 V. The device also features a watchdog timer and a manual reset input, allowing for further flexibility and enhanced system reliability.

The NCP300LSN28T1 also includes an overvoltage detection circuit. This circuit monitors the voltage on the PWR pin and activates a warning flag, the VORSET pin, when the voltage exceeds a preset overvoltage threshold voltage. Additionally, the device can be configured to automatically initiate a reset output when the PWR pin voltage climbs above the preset overvoltage threshold voltage.

The NCP300LSN28T1 has a wide range of features and capabilities, making it ideal for a variety of applications. The device has a maximum operating temperature of + 125 °C and a maximum supply voltage of + 5.5 V. It is available in a 14-pin mini SOIC package and is RoHS compliant.

Conclusion

The NCP300LSN28T1 from ON Semiconductor is a low-dropout, high-precision supervisory IC that is used to monitor and protect power supplies. It has a wide range of safety features and can be used in automotive and transportation applications that require ignition detection. Additionally, the device has an adjustable threshold voltage, an adjustable reset timeout, a watchdog timer, and a manual reset input. The NCP300LSN28T1 is available in a 14-pin mini SOIC package and is RoHS compliant.

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