NCP561SN18T1G

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NCP561SN18T1G is an ultra-low quiescent current linear regulator that operates at maximum power supply 1.8V. It uses an external resistor to provide adjustable output voltage from 0.7V to 1.8V. In addition, NCP561SN18T1G offers fast transient response, low dropout voltage (100mV at 500mA) and low output voltage noise. This combination makes it an ideal choice for ultra-low power applications.

Application Field

NCP561SN18T1G provides highly efficient and effective voltage regulation for ultra-low power applications. It is suitable for digital systems, such as personal digital assistants (PDAs), calculators and smart phones, as well as embedded systems. It is also a good choice for portable handheld personal electronics.

This device is available in various specific packages, such as SOT23-5, VSON-3, TDFN-3X3 and so on. For example, it can be used on SOT23-5 form in ultra-low power applications. It is well suited for low power system controllers and power management ICs (PMIC).

Working Principle

NCP561SN18T1G consists of an adjustable-bias PNP bipolar transistor with a darlington configuration, a low-noise voltage reference, an error amplifier and a series current limit circuit to protect the device from overloads and short-circuits.

Under normal conditions, the output voltage of NCP561SN18T1G is regulated to a predetermined value by the external resistor connected to the output voltage pin (Vout). This adjustable voltage reference (VREF) is then compared to the voltage feedback pin (FB) to generate an error signal. This error signal is then amplified by the error amplifier and sent to the base of the PNP transistor to adjust the output voltage. In other words, when an error is detected, the output voltage is adjusted by the PNP transistor, which decreases the output voltage until the desired level is reached.

In addition, the device includes a high-current current limit circuit that is activated during overloads or short-circuits. This current limit circuit limits the output current and protects the device from damage. Finally, the series current limit circuit is bypassed when the output current reaches the programmed limit.

Advantages

NCP561SN18T1G can regulate the output voltage up to 1.8V with high efficiency. It offers fast transient response and low dropout voltage, which make it a good choice for ultra-low power applications. With its low quiescent current and low output voltage noise, it is an ideal choice for digital systems, such as personal digital assistants (PDAs), calculators, smart phones and portable handheld personal electronics. Furthermore, it is available in various package types, such as SOT23-5 and TDFN-3x3.

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