TPS74901DRCT

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PMIC - Voltage Regulators - Linear is a type of integrated circuits (ICs) that provide power to other electrical and electronic components. These devices are used in a wide variety of applications, including automotive, consumer electronics, industrial control, and communication systems. As one of the voltage regulators in this family, TPS74901DRCT is a low-dropout (LDO) linear regulator specifically designed for the automotive power electronics applications. This paper will go through the application field and the working principle of this device.

Application field

The TPS74901DRCT is dedicated for automotive power electronics applications, designed to fulfill the power requirements for various advanced motor drives, sensors, communication systems, microcontrollers, and other automotive applications with certain voltage regulation requirements. This device consumes ultra-low current and is especially suitable for applications where ultra-low marine battery capacity can result in instant vehicle shutdown. The fast current-limit response rate and high transient voltages limit the voltage transients, which helps improve the reliability of on-board automotive systems.

The device consists of a proprietary power management unit (PMU) that utilizes two high-sensitivity voltage-sensing comparators, an over-voltage ADC, a current-sense regulator, an internal gain amplifier, and a protection time delay circuit. This integrated PMU provides turn-on, over-current, and over-voltage protection, making it especially suitable for the application in, for example, automotive body and power electronics with tight voltage regulation requirements.

Working principle

The working principle of the TPS74901DRCT is based on its PMU, which regulates the output voltage by controlling and monitoring the supply current provided to the load. This PMU comprises the two high-sensitivity voltage-sensing comparators, which detect the voltage difference between the output and ground. When the output voltage reaches the over-voltage setting value, the comparators output high and trigger the over-voltage ADC, which then controls and limits the output voltage. The PMU also includes an internal gain amplifier, which amplifies the control signal and provides the control current to the load.

In addition to the PMU, this device also features a current-sense regulator. This circuit is used to control the supply current of the load and provides the over-current protection. It senses the current of the load and compares it with the predetermined current limit setting. When the current exceeds the setting value, the over-current protection will be triggered and the output voltage will be decreased.

Finally, the protection time delay circuit is used to guarantee a reliable turn-on time. It delays the turn-on time for a certain period of time before the power is increased to the full rate. This circuit also avoids unnecessary current spikes and reduce the losses associated with the peak current.

Conclusion

In short, the TPS74901DRCT is a low-dropout linear regulator specifically designed for automotive power electronics applications. The device features a PMU that can provide turn-on, over-current, and over-voltage protection functions. In addition, a current-sense regulator and a protection time delay circuit are integrated in the device, providing extra protection and reliable control. With its advanced power management technology, this device can fulfill the tight voltage regulation requirements of various automotive applications.

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