TPS79018DBVT

Current - Output:	50mA
Base Part Number:	TPS79018
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	85dB (1kHz)
Current - Quiescent (Iq):	28µA
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:	Tape & Reel (TR)

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TPS79018DBVT Application Field and Working PrinciplePower Management ICs (PMICs) are semiconductor devices used to monitor and control electrical power in electronic systems. Among its many variations, PMICs must also provide a steady and adjustable supply of electrical power to various components. Voltage regulators are one of the most common types of PMICs used to perform this task, and they come with various features, outputs, and category variations.

Modulation Types of Voltage Regulators

Voltage regulators are primarily divided into three categories based on the type of modulation they use - linear, switching, and switching-linear hybrids. Linear voltage regulators use an active element, typically a transistor, combined with other passive components such as resistors, capacitors and inductors, to regulate voltage levels through varying the resistive load of the transistor. They have low efficiency, low noise, and handle small load currents, but generate heat which limits operating conditions and reduces their overall power output.

Characteristics of the TPS79018DBVT

The Texas Instruments TPS79018DBVT is a fixed output, low-dropout linear voltage regulator with an adjustable output voltage option. It has a low ground current and a low dropout voltage of 0.8 V. With a high PSRR and a minimum operating temperature of -40°C, it is suitable for many applications such as portable equipment, set-top boxes, home appliances, and industrial applications.The TPS79018DBVT is a three-pin device with Input, GND, and Output pins. It has an input voltage range of 4.5V to 12V and can provide an output voltage range of 1.2V to 4.2V, adjustable with a single resistor. It has a maximum output current of 1A and a maximum power dissipation of 5.3W.

Application Field and Working Principle of TPS79018DBVT

The TPS79018DBVT is a low-dropout linear regulator designed to efficiently convert a higher input voltage to a regulated and adjustable output voltage. It is suitable for applications that require very low quiescent current and a low-noise voltage regulator, such as portable equipment and home appliances.The TPS79018DBVT operates using an adjustable resistor (R SET) between the output and GND pins. As the R SET resistance increases, the output voltage decreases, and vice versa. When the regulator is working, the bottom of the transistor\'s base-emitter junction is connected to the input voltage. The collector current is then controlled by the voltage on the emitter.The voltage divider formed by the series resistor (R1) and the adjustable resistor (R SET) will pass a current into the base of the transistor. This will cause the transistor to operate in its active region, where the collector current is proportional to the base current. The voltage across the output pin will be a regulated voltage, determined by the voltage divider. The higher the voltage drop on the R SET resistor, the lower the output voltage will be.

Conclusion

The TPS79018DBVT is a low-dropout linear voltage regulator. It has a low ground current and a low dropout voltage, making it suitable for portable equipment, set-top boxes, and other low-noise applications. The TPS79018DBVT operates using an adjustable resistor (R SET) between the output and GND pins, allowing it to provide a wide range of output voltages with a single resistor. Overall, this regulator can be effectively used to convert a higher input voltage to a regulated and adjustable output voltage.

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