NCP301LSN33T1G

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NCP301LSN33T1G Application and Working Principle

NCP301LSN33T1G is an integrated supervisor integrated circuit (IC) with a single fixed-voltage regulator. The device provides several cellular functions, including reset generation, power-on reset (POR) and low-voltage detection and time-out. It is key component of power management IC (PMIC) designed to monitor battery-powered systems. This application note outlines the circuitry of NCP301LSN33T1G and describes its different parts and functions.

Technically speaking, NCP301LSN33T1G is a simple low-voltage supervisor with a voltage-reference, comparator, and output. It integrates an oscillator and a reset generator with an adjustable delay, allowing the user to define a reset circuit that has the exact timing, voltage-threshold, and current-threshold needed for any given application. The oscillator sets the maximum and minimum thresholds for power-on reset (POR) and low-voltage detect (LVD) respectively. The adjustable time-out feature or reset time defines the minimum time the voltage has to drop to trigger the reset signal. In addition, the reset signal is connected directly to the power reset generator, which is capable of generating a reset pulse at the end of the time-out cycle.

The NCP301LSN33T1G is primarily intended for supervision of single power supplies in consumer, industrial, computer and communications systems such as cell phones, multimedia, audio and video products. It is ideal for providing reset in battery-powered systems, secured processor access, and system power-on reset. It can also be used for monitoring power and system margins, detecting an overvoltage condition, and preventing damage from ESD events. The NCP301LSN33T1G can provide the power management system with an early-warning of an impending battery failure and implement shutdown sequences, improving system performance and reliability.

The functionality of the NCP301LSN33T1G can be easily programmed by connecting it to an external resistor divider network and capacitors, as shown in Figure 1. The upper resistor is connected to an adjustable voltage reference, while the lower resistor is connected to an analog comparator with hysteresis. The upper resistor sets the reset voltage, while the lower resistor serves as a comparator reference. The operation of the NCP301LSN33T1G is further modified by the addition of external capacitors, as shown in Figure 2. These capacitors provide the required delay for the duration of the reset pulse.

In addition, the NCP301LSN33T1G has an integrated one-shot timer. This timer sets the minimum time the voltage must remain below the supervisor threshold in order to generate the reset signal. The minimum time-out delay of the reset generator will be determined by the user-defined external capacitance. When the voltage returns above the reset threshold, the one-shot timer will delay the reset for a user-defined duration.

The NCP301LSN33T1G is also designed to provide an indication of an impending battery failure. The supervisor is designed to generate a reset signal when the supply voltage drops below user-defined thresholds. This allows the user to implement some form of power management system, such as a shutdown sequence, to prevent system damage in case of low voltage.

In summary, the NCP301LSN33T1G is a low-power supervisor IC with many features and capabilities. It is ideally suited for monitoring consumer, industrial, computer and communications systems. An important feature of this supervisor is the adjustable reset time and adjustable voltage-threshold, which provide the user with flexibility and accuracy in determining the reset conditions. In addition, the integrated one-shot timer allows the user to determine the minimum time before the reset signal is generated. The NCP301LSN33T1G is a key component of PMIC designed to ensure the safe operation of battery-powered systems.

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