TPS77918DGK

Current - Output:	250mA
Base Part Number:	TPS77918
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable, Reset
PSRR:	55dB (1kHz)
Current - Quiescent (Iq):	125µA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction of TPS77918DGK

TPS77918DGK, by Texas Instruments, is the company’s first low-current, ultra-low-dropout linear regulator. It is designed to offer a 1.5-V output voltage, delivering up to 80 mA of output current, in a very small solution size. The TPS77918DGK also offers a low quiescent current (60 nA) and a remarkably low dropout voltage of only 75 mV at full output current.

Application Field of TPS77918DGK

The TPS77918DGK is a great choice for system designers looking for a compact, low-current, low-dropout regulator. It is particularly beneficial in battery-powered applications such as wearable and personal electronics as it can extend battery life by reducing quiescent current. Other applications include low-power portable equipment, smart phones and tablets, battery-powered controllers and sensors, security systems, and any other application that requires ultra-low-dropout, low-quiescent current, and low-output voltage.

Functional Characteristics of TPS77918DGK

TPS77918DGK offers several features designed to help with extended battery life in a tiny form factor, including:- Low quiescent current: The TPS77918DGK has a quiescent current as low as 60 nA, making it an ideal choice for battery-powered applications, prolonging battery life.- Ultra-low dropout voltage: When powered by a 1.8-V input voltage and delivering 80 mA of current, the dropout voltage of the TPS77918DGK is only 75 mV.- Temperature range: The extended temperature range of -40°C to 125°C allows for broad, reliable system operation in harsh environments.- Current limit: The TPS77918DGK is designed with a low current-limit threshold which limits the max output current to 80 mA and protecting from an overload event.

Package and Pin Description of TPS77918DGK

The TPS77918DGK is available in the tiny, 1.62-mm × 1.17-mm SC70-5 package. This package has five pins. They are:- Pin 1 (VIN): This is the input voltage pin that is supplied when the internal regulator is enabled.- Pin 2 (GND): This is the ground pin.- Pin 3 (EN): This is the enable pin that is used to enable or disable the internal regulator.- Pin 4 (VOUT): This is the output voltage pin that is used to supply the external load when the internal regulator is enabled.- Pin 5 (RBIAS1): This is the resistor bias pin that is used to shift the output voltage of the internal regulator.

Work Principle of TPS77918DGK

The TPS77918DGK is a linear voltage regulator that works by maintaining a constant voltage between the input and output pins of the device. This is done by regulating the output voltage through the control loop. The control loop is made up of the error amplifier, reference voltage, compensation circuit, and the output voltage.When the input voltage is applied to the device, the error amplifier will compare the input voltage with the internal reference voltage and generate an error voltage. This error voltage is then used by the compensation circuit to adjust the output transistor’s gate voltage, which in turn adjusts the output voltage of the device. The output voltage of the device is then regulated to theReference voltage, thus maintaining a constant voltage between the input and output pins.

Conclusion

In conclusion, the TPS77918DGK is a low-dropout linear voltage regulator by Texas Instruments. It has an ultra-low dropout voltage of 75 mV at full output current, a low quiescent current of 60 nA and an extended temperature range of -40°C to 125°C. It is designed for battery-powered applications, offering a compact solution to extend battery life. It is also beneficial in other applications that require ultra-low-dropout, low-quiescent current, and low-output voltage.

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