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PMIC - Voltage Regulators - Special Purpose

NCV51400MNTXG is an automotive-grade, low-dropout linear regulator (LDO). It supports one output voltage, and its output can be adjusted from 3.75V to 12V. It is a tailored device for 12V automotive applications, providing a space-saving footprint and high power efficiency. This regulator has a typical dropout voltage of 0.3V at 1A load and 0.6V at 3A load.

The NCV51400MNTXG is based on a proprietary, high-performance control architecture, enabling a very low quiescent current of typically 8µA and a wide input voltage range of 3.2V to 13.2V. It includes low-power enable and shutdown functions with a fixed LOFF reference voltage and minimal current leakage when disabled. The enable function operates with a logic high input level of 1.8V, and the shutdown function operates with a logic low input level of 0.5V.

Application

NCV51400MNTXG is designed for automotive applications and is qualified for automotive AEC-Q100 Grade 0 requirements. It is suitable for use in harsh automotive environments ranging from -40 °C to 125 °C temperature due to its robust design, high power efficiency and lower dropout voltage. It is applied to electric vehicles, Hybrid electric Vehicles, battery management systems, Automotive infotainment, vehicle diagnostic systems, industrial monitoring systems, automotive lighting, illuminated starts/stop buttons, engine computers, as well as in other ADAS (Advanced Driver Assist Systems).

Working Principle

The NCV51400MNTXG is a low-dropout linear regulator designed for automotive applications. It is based on a proprietary architecture and proprietary circuitry to provide high efficiency, low noise, and low quiescent current. In operation, the device provides one adjustable output voltage from 3.75V to 12V by using an external resistor divider. The feedback voltage from the divider is compared to a voltage reference and it is used to control the output voltage. The internal current limit continuously monitors the output current to ensure safe operation and to protect the device from overload conditions.

The enable/shutdown function allows the user to enable or disable the output voltage by logic control. When the device is disabled, it has a very low leakage current, reducing the overall system power consumption. The LOFF reference voltage is also used to control the enable/shutdown and ensure a fixed threshold level of 0.5V during the shutdown and 1.8V during the enable. The device also has an integrated current limit circuit which monitors the output current, and provides over-current protection for the system.

Conclusion

The NCV51400MNTXG is an automotive-grade low-dropout linear regulator and an ideal solution for automotive applications. It is designed with a proprietary architecture and superior components to provide high efficiency, low noise, and very low quiescent current. The device also includes a fixed threshold level, an adjustable output voltage, a current limit circuit, and a low-power enable/shutdown function. The device is designed for automotive use and is qualified for AEC-Q100 Grade 0 requirements.

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