TPS72718YFFR

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TPS72718YFFR Application Field and Working Principle

TPS72718YFFR is a low quiescent current, low dropout (LDO) linear regulator from Texas Instruments. It has an adjustable output voltage from 0.7V to 5.5V, which make it suitable for wide range of applications. This device features exceptionally low quiescent current, fast transient response, short-circuit protection, and high power supply rejection ratio. The device is integrated with an NMOS pass-transistor, a voltage reference, and an error amplifier with current limit. It is available in SOT23-6L package, allowing it to be used in small spaces.

Overview

TPS72718YFFR voltage regulator has a wide range of applications in small form factor systems due to its small package size and high efficiency. It can be used in multiple applications such as mobile phone, video game console, HDTVs, set-top boxes, wearable devices and many other similar systems. With its adjustable output voltage and low quiescent current, it is also suitable for battery-powered systems as well. It is also capable of supplying very low output current, as low as 1mA, making it possible to be used in low dropout applications. In addition, it also feature over-current protection and thermal shutdown to protect the system from any sudden events.

Working Principle

The basic working principle of TPS72718YFFR is that it takes a regulated and filtered input voltage and it supplied a regulated output voltage through an NMOS pass transistor. It works as a voltage regulator by comparing the output voltage to an internally generated (reference) voltage and then adjusting the output voltage until the error between the two is minimized. The output is regulated by controlling the gate voltage of the pass transistor, to adjust the voltage drop across it.

The circuit itself consists of an error amplifier, a voltage reference, a PWM comparator and an NMOS pass transistor. The error amplifier compares the input voltage and the internally generated voltage reference. The error signal is then sent to the PWM comparator, which controls the gate voltage of the NMOS transistor. If the output voltage is lower than the reference, the gate voltage is increased, allowing more current to pass, and thus increasing the output voltage. The opposite holds true if the output voltage is higher than the reference.

Features

TPS72718YFFR linear voltage regulators offer robust performance and stability in even worst-case conditions. Some of its key features include:

• Adjustable output voltage (0.7V to 5.5V)
• Low quiescent current (21µA at typical TA and IO =100mA)
• High power supply rejection ratio (50dB at 1kHz)
• Low dropout voltage (170mV at 100mA)
• Fast Transient Response (10µs typical for 10% step-down)
• High accuracy (±1.5% Typical at VOUT = 3.3V)
• Over-current protection
• Thermal shutdown
• SOT23-6L package

Conclusion

TPS72718YFFR linear voltage regulators from Texas Instruments are easy-to-use and feature low quiescent current and high power supply rejection ratio. Their small package size makes them suitable for small form-factor systems, while their adjustable output voltage makes them suitable for battery-powered systems. The device also offers multiple safety features including over-current protection and thermal shutdown to ensure the system’s safety in any situation. With all these features, TPS72718YFFR is a great choice for many different applications.

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