TLV1117LV18DCYT

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TLV1117LV18 is a general-purpose low-dropout (LDO) voltage regulator which has been designed to provide a current of up to 250mA and a voltage of 1.8V with a dropout voltage of 0.6V at this output current. It belongs to the family of linear voltage regulators which have gained increased popularity in a wide range of applications due to its better performance than switching regulators when operating at low input voltages and currents. This also makes them suited for low-noise and high-precision power supply designs, in contrast to the complex designs associated with switcher regulators.

The main feature of the TLV1117LV18 is its low drop-out voltage and wide output range which makes it suitable for low-noise applications such as driving the supply rails of amplifiers and other sensitive circuitry. Additionally, the high power efficiency and the low quiescent current of the device make it ideal for powering low-noise, low-power applications such as cellular phones, PDAs and other battery-powered applications.

The TLV1117LV18 is capable of regulating the output voltage even when the input voltage changes by ±20%. It also features an externally adjustable current-limit protection for overload or short-circuit detection. This device is available in an SO-8 package and an MSOP-9 package. The SO-8 package has an exposed pad for better thermal performance, while the MSOP-9 package has a narrow package for density-sensitive applications. In addition, it has an enable pin for logic or manual control.

The working principle of linear regulators can be understood by considering a basic circuit arrangement, consisting of an input voltage source, a series pass element, a reference voltage and a feedback loop. The series pass element is typically a transistor. The reference voltage is a constant voltage, and the feedback loop compares the output voltage of the pass element to the reference voltage. When the series pass element begins to conduct, the voltage drop across it causes the output voltage to drop. When this happens, the feedback loop sends a control signal which increases the current through the series pass element causing the output voltage to rise back up to the level of the reference voltage.

When the TLV1117LV18 is connected to an input voltage source, this series pass element is a p-channel MOSFET. In this way, the current through the gate of the MOSFET is regulated to a value controlled by the reference voltage. The reference voltage of the TLV1117LV18 is 1.8V and is derived from an on board zener diode clamped to a voltage divider circuit. In addition, an adjustable current-limit circuit is used to protect the device from overload or short circuit conditions.

In conclusion, the TLV1117LV18 is an excellent choice for low-noise applications due to its low dropout voltage, wide output range and excellent power efficiency. It is suitable for many applications such as audio amplifiers and cellular phones due to its adjustable current limit protection and logic enable control. Its small size and wide input voltage range makes it applicable to a wide range of projects.

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