NCV4264ST50T3G

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NCV4264ST50T3G is an advanced low-voltage dropout (LDO) linear regulator. It is designed to provide an extremely low-voltage and high-performance voltage regulation solution, while maintaining a low quiescent current (IQ). The device is available in three package configurations, including TO-220, micro-TO-243 and mini-TO-252. This advanced device is designed to provide an extremely power-efficient alternative to conventional 7805-type linear voltage regulators, with a high power output capability and improved current-limit protection.

Application Field and Working Principle

The NCV4264ST50T3G is ideal for any battery powered or power-sensitive application requiring a highly efficient, low-voltage, switching regulator solution with an output voltage range of 2.5V to 6.3V. It typically functions as a post-regulator that controls the output voltage of a main Converter stage. The device is an LD, which means it works in the same mode as a "normal" linear regulator on a positive (boost) half-cycle and in a negative (buck) half-cycle. This makes it a very efficient design, providing highly accurate output voltage control as well as fast transient response.

At the core, the NCV4264ST50T3G is a differential amplifier with a voltage comparator. It takes the output voltage of the main converter and compares it to the reference voltage. When the output voltage drops below the reference voltage, the comparator will trip and enable the N-channel MOSFET. This activates the switching cycle, in which power is transferred from the input to the output using the inductor, capacitor, and FETs. When the output voltage reaches the desired level, the comparator trips again, and switches off the FET. This cycle is kept in a steady state by the negative-feedback system, which keeps the output voltage within a few millivolts of the desired voltage.

The performance of the NCV4264ST50T3G is further improved by its low quiescent current. This reduces the amount of power drawn from the input source when the device is enabled and eliminates the need for an external memory circuit to store the current state of the device. The device also supports adjustable output current and shutdown, as well as input voltage range up to 42V. Furthermore, the device provides a soft-start function to avoid any inrush current and over-voltage or over-current fault protection.

Conclusion

The NCV4264ST50T3G is ideal for any voltage regulator application requiring high power efficiency and minimal quiescent current. It provides a simple, highly accurate and power efficient alternative to conventional linear regulators, with an output voltage range of 2.5V to 6.3V, adjustable current limit and shut down, and soft start. The device is also equipped with adjustable output current, current limit protection and over-voltage protection, making it a safe and reliable solution for industrial, medical and automotive applications.

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