TPS79933DRVR

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TPS79933DRVR Application Field and Working Principle

The TPS79933DRVR is a monolithic, low-dropout (LDO) linear regulator designed to provide ultra-low dropout and low quiescent current operation with an adjustable output voltage range of 0.8 V to 5.1V. It features excellent load and line transient responses and offers high reliability. Designed for use as a power supply to microcontrollers, digital signal processors, and assorted digital-to-analog and analog-to-digital converters, this regulator offers excellent flexibility, very low dropout and low output noise. The TPS79933DRVR is available in a compact SOT223-6 package.

Features and Advantages

• Ultra-low dropout voltage (as low as 80mV at light load)
• High PSRR (power supply rejection ratio) performance
• Accurate regulator output voltage
• Wide input supply range: 2.5V to 5.5V
• Very low quiescent current without any enabled components
• Fast transient response
• Internal over-temperature protection
• Low noise operation

Applications

• Portable electronic devices
• Wireless communications
• Power consumers with low power requirements
• Battery-powered products
• RF applications
• Desktop and server power supplies
• Cellular phones and other mobile devices
• Industrial and consumer appliance power supplies

Working Principle

The TPS79933DRVR is a monolithic, low-dropout (LDO) linear regulator. It has an adjustable output voltage range of 0.8 V to 5.1V, and a wide input voltage range of 2.5V to 5.5V. Its quiescent current is very low, and its load and line transient responses are excellent. It has internal over-temperature protection, and provides ultra-low dropout voltage and low output noise. In the application, the voltage regulator serves as a power source for an operation and idle mode, and it can protect the low-voltage microcontroller from excessive output current and power-supply noise. A resistor divider is used to set the output voltage for the voltage regulator, and the DN and UP pins of the regulator control the feedback loop to regulate the output voltage.

The TPS79933DRVR is designed with two main parts: a pass element and a control circuit. The pass element is connected between the input and output terminals, and it is comprised of an N-channel MOSFET, which acts as the main power switch, and a senseFET. The N-channel MOSFET is connected to the input voltage via the common source to provide power amplification, while the sense FET is connected to the output–load junction to provide current path regulation. The control circuit attached to the pass element senses the voltage difference between the input terminal and the output terminal, and adjusts the gate voltage of the pass element at a constant frequency to maintain the output voltage at a desired level.

The TPS79933DRVR has several feedback pins that can be used to detect the output voltage and current. If the input voltage changes or the loads demand more current than the regulated voltage can supply, the output voltage will either increase or decrease accordingly. The function of the feedback pins is to monitor the output voltage and current and then adjust the settings of the control circuit to ensure that the output voltage remains constant. The regulators are designed to respond quickly to load changes, so they can provide stable output voltages even with varying loads.

Conclusion

The TPS79933DRVR is a monolithic, low-dropout (LDO) linear regulator designed to provide ultra-low dropout and low quiescent current operation with an adjustable output voltage range of 0.8 V to 5.1V. It features excellent load and line transient responses, and offers high reliability. The device is particularly well suited for use in portable electronic devices, wireless communications, power consumers with low power requirements, battery-powered products, and various industrial and consumer appliance power supplies. This regulator offers excellent flexibility, very low dropout and low output noise. It is available in a compact SOT223-6 package.

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