NCP561SN28T1

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The NCP561SN28T1 is a linear voltage regulator specifically marketed as a “low-dropout low-quiescent-current linear regulator” in the field of Power Management Integrated Circuits (PMIC). It’s a type of voltage regulator that enables a lower dropout voltage than the common regulators, meaning it can output more power with less input voltage. Not to be confused with the switching voltage regulators that use pulse width modulation to regulate the output, linear voltage regulators use a voltage amplifier in the feedback loop to control their output.

The wide range of features in the NCP561SN28T1 make it a versatile device for many applications. It has an input voltage range from 1.8V to 5.5V, enabling it to be used in multiple power sources. Furthermore, the regulator provides a low dropout output for high current applications and consumes very low quiescent current when in the off or sleep mode. The current limit of this device is set internally at 750mA and the device is guaranteed to remain stable while using a 2.2uF or greater output capacitor. It also includes an enable control pin, enabling the user to control the transition to the off mode.

The NCP561SN28T1 provides very low output noise due to its built-in switching frequency control circuit, making it suitable for audio applications. In addition, its thermal performance is also excellent due to its low thermal resistance, and its reverse current protection feature prevents the device from being damaged due to polarity reversal. All of these features make the NCP561SN28T1 a great choice for applications that require low voltage and current consumption.

Working Principle

The NCP561SN28T1 uses a three-terminal linear regulator architecture. It consists of a voltage reference, an error amplifier, and an output transistor that operate in combination to provide the desired output voltage. The regulator monitors the output voltage and compares it to an internal reference voltage, and adjusts its duty cycle accordingly to maintain the output voltage within very tight tolerance bands.

When the output voltage rises above the reference voltage, the error amplifier begins to reduce the duty cycle. This in turn reduces the base drive to the pass transistor, or in other words, the output current. When the output voltage drops below the reference voltage, the opposite happens. This is how the NCP561SN28T1 is able to maintain the output voltage over a range of input voltage and current conditions, while also keeping the output voltage in a safe operating range.

Conclusion

The NCP561SN28T1 is a versatile low-dropout low-quiescent-current linear voltage regulator that is designed for applications that require both low voltage and current consumption. It features an exceptionally low quiescent current when in the off or sleep mode, a wide input voltage range, and a built-in switching frequency control circuit for low output noise. It is a great choice for audio applications due to its low noise, and its reverse current protection guarantees that the device remains safe from polarity reversal.

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