TPS78318DDCT

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TPS78318DDCT Application Field and Working Principle

The TPS78318DDCT is one of Texas Instrument\'s advanced linear voltage regulators. It is designed to fit into small size mobile device applications that require constant voltage deregulation. As such, it belongs in the category of PMIC (Power Management Integrated Circuit) - Voltage Regulators - Linear.

The TPS78318DDCT is designed to provide regulated low dropout voltage or LDO in battery powered devices and other applications where low current consumption and low noise performance are critical. Working on an input voltage between 1.8V to 5.5V, the device\'s output voltage is adjustable from 0.8V to 3.3V. It can deliver a maximum output current of 150mA with a power dissipation of 600mW. The LDO is capable of providing as low as 1µA of standby current when in Shutdown mode.

The integrated low voltage detector (LVD) feature allows for low voltage protection of the battery for improved battery life. The LVD can trigger an interrupt output notice when the voltage reaches a preset threshold. As a protection measure, the LDO also incorporates inrush current limiting and short circuit protection that are designed to automatically limit the output fault current level.

The TPS78318DDCT is fabricated in a 3mm2 WSON package that is perfect for smaller electronic applications. With its very low quiescent current consumption, fast transient response, as well as its low Iq/high PSRR performance, it is well-suited for a variety of mobile applications such as smartphones, wearables, or IoT devices.

The working principle of the TPS78318DDCT is similar to other Linear Voltage Regulators. It makes use of an internal voltage reference and a pass transistor to achieve a regulated output voltage. The TPS78318DDCT utilizes a voltage divider connected from the output to the feedback terminal which provides a stable low dropout background for the internal voltage reference. This is followed by the control amplifier that compares the set-point voltage at the non-inverting input with the output voltage at the inverting input and generates the necessary correction current to keep the output voltage constant.

Input current is mirrored to a matched pair of series pass transistors, with one controlling the output voltage and the other supplying power to the internal circuitry. The input current is then switched between the two pass transistors while their respective output is monitored and any changes are corrected accordingly. In this way, the marked advantage over other designs is the low dropout voltage capability, which allows for lower operating currents and higher efficiency because of the reduced power wastage.

The TPS78318DDCT is perfect as a low noise and low dropout voltage regulator that is capable of providing regulated voltage with fast transient response. It is versatile and can be used for a variety of portable devices thanks to its adjustable voltage and respectable output current capability. This makes the TPS78318DDCT an attractive choice for applications such as portable medical and industrial devices. Furthermore, with its simple and efficient design and low quiescent current, the TPS78318DDCT is an optimal solution for mobile devices that are constrained in size and power budget.

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