TPS79318DBVT

TPS79318DBVT Application Field and Working Principle

The TPS79318DBVT (Ti TPS79318 DBVT) is a family of single-chip power supply linear regulators that integrate an error amplifier, a voltage reference, an adjustable voltage divider, and a power switch into a single monolithic IC. The TPS79318DBVT family of ultra-low dropout regulators can be used to provide output current in either range from 0.5mA to 1.5A or from 1mA to 5A. This is because the maximum output current is adjustable with a simple external resistor.

The TPS79318DBVT family can be used in a wide range of applications, including battery-powered portable products, automotive supplies, and computing systems. For example, it is suitable for use in mobile phones, PDAs, notebook PCs, handheld two-way radios, computers, and industrial applications.

Working Principle

The TPS79318DBVT is based upon an internal linear regulator and an external power switch. The power switch consists of a P-channel MOSFET (metal-oxide-silicon field-effect transistor) for supplying the load with power and an N-channel MOSFET for providing the return path to the input voltage source. The main advantage of this topology is that the output voltage is constantly monitored and adjusted to the intended level.

This regulator has a built-in error amplifier that senses the voltage difference between the output and the reference voltage. When the output voltage rises above the reference voltage, the error amplifier affects the gate voltage of the P-channel MOSFET, which turns off the device and disconnects the load. On the other hand, when the output voltage is lower than the reference voltage, the error amplifier reduces the gate voltage of the N-channel MOSFET and the device is turned on. This process continues until the output voltage is within the specified range of the reference voltage.

The TPS79318DBVT provides power better efficiency because of its low dropout voltage. This regulator family offers a wide range of protection features, such as short-circuit protection, current-limit protection, thermal-overload protection, and over-voltage protection.

Conclusion

The TPS79318DBVT family of ultra-low dropout linear voltage regulators is an excellent choice for low-voltage applications requiring power and current accuracy and protection from over-voltage and over-current conditions. With its small size and low-dropout voltage, these regulators offer higher efficiency and are ideally suited for both embedded and battery-powered applications.