NCV551SN28T1

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Linear voltage regulators are an important part of an integrated circuit, providing the precise regulated voltage to the other components of the device. The NCV551SN28T1 is a CMOS low-dropout three-terminal positive voltage regulator from on Semiconductor that is suitable for battery-operated applications. This regulator supports output currents up to 1 A and is available in SOT-223 and TO-220 packages with adjustable and fixed output voltage options.

The NCV551SN28T1 is a voltage regulator with a typical dropout voltage of 200 mV. It offers improved power supply rejection ratio of 60 dB and noise rejection of 90 dB. It has fast transient response (1 microsecond) and low quiescent current of 0.5 mA. The NCV551SN28T1 features internal current limit, thermal shut-down, and reset functions. It has reverse battery protection and reverse current protection. The NCV551SN28T1 is suitable for low output noise, low dropout voltage applications, where reduced quiescent current is required.

Applications of the NCV551SN28T1

The NCV551SN28T1 is ideal for applications that require low output noise, high power supply rejection ratio, low dropout voltage, and low quiescent current. It is used in battery-powered applications such as portable devices, wireless communication systems, personal digital assistants (PDAs), portable media players, digital cameras, digital audio systems, PDAs, mobile phone, and laptop computers. Additionally, it can be used in motor drives, GPS receivers, and medical equipment.

Working Principle of the NCV551SN28T1

The NCV551SN28T1 is a linear voltage regulator that is designed to maintain a constant output voltage regardless of changes in the input voltage, load, or temperature. It consists of an error amplifier, a transistor, and compensation networks. The error amplifier is used to compare the feedback voltage (Vout) with a reference voltage (Vref). When there is a change in the output voltage or load current, the error amplifier adjusts the base voltage of the transistor. This allows the output voltage to remain stable.

The NCV551SN28T1 also uses a voltage-mode control system. The voltage-mode control system is used to regulate the output voltage against changes in input voltage. It uses an internal loop that consists of the error amplifier and the transistor. When the input voltage is higher than the desired output voltage, the error amplifier increases the transistor’s collector voltage, which reduces the output voltage. Similarly, when the input voltage is lower than the desired output voltage, the error amplifier decreases the transistor’s collector voltage and increases the output voltage.

The NCV551SN28T1 also features reverse battery protection, reverse current protection, thermal shut-down and reset functions to ensure reliable operation. In addition, it has a fast transient response (1 microsecond) for improved load transient and line regulation.

Conclusion

The NCV551SN28T1 is a low-dropout three-terminal positive voltage regulator from on Semiconductor. It is ideal for applications that require low output noise, high power supply rejection ratio, low dropout voltage, and low quiescent current. It provides a fast transient response (1 microsecond) and features reverse battery protection, reverse current protection, thermal shut-down, and reset functions. This regulator is suitable for battery-operated applications such as portable devices, wireless communication systems, PDAs, portable media players, digital cameras, and digital audio systems, as well as motor drives, GPS receivers, and medical equipment.

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