TPS77518PWPRG4

The TPS77518PWPRG4 is an operational device belonging to the Pressure Regulated Linear Voltage Regulator family from Texas Instruments. This product comes in an ultra-small 3x3mm QFN package and offers several features including a current limit of 3.75A, a fixed output voltage of 1.8V, and a voltage dropout of lower than 0.5V.

The TPS77518PWPRG4 device is designed to provide low-noise, high-efficiency power solutions for mobile applications. It can handle a wide range of input voltages, and its high power-efficiency makes it ideal for battery-powered applications such as handheld PDAs and smartphone platforms.

The TPS77518PWPRG4 device is a linear voltage regulator that maintains the output voltage at a fixed voltage. This is done by using a p-channel MOSFET that operates in linear mode. The gate voltage of this MOSFET is determined by a high-precision band gap reference. The source of this MOSFET is connected to the input voltage, and the drain is connected to the output.

When the load current increases, the voltage at the drain of the MOSFET starts to drop. This drop is detected by the voltage divider connected to the output. This divider includes two resistors that divide the output voltage and feed it as feedback voltage to the non-inverting input of an amplifier. This amplifier then increases the gate voltage of the MOSFET, which causes the MOSFET to conduct more current and supply a higher voltage at the output.

The TPS77518PWPRG4 device can also detect an over-current condition and automatically shut off the output. This protection is provided by a low-voltage sensing circuit that monitors the voltage across the current-sense resistor. This circuit raises the gate voltage of the MOSFET until the voltage reaches its maximum possible value. This in turn causes the MOSFET to shut off, thereby protecting against a short circuit or current overload.

Thus, the TPS77518PWPRG4 is ideal for a wide range of applications, from consumer electronics to automotive electronics, where low noise, high efficiency, and protection from over-currents are needed.