TPS77433DGKRG4

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TPS77433DGKRG4 Application Field and Working Principle

Linear voltage regulator is a very common electronic component that is widely used in portable electronic devices and embedded systems for implementing power management features, such as manual and automatic power-on reset, reference voltage, over-current and under-voltage protection, and strict voltage control. The TPS77433DGKRG4 from Texas Instruments is a low-dropout (LDO) linear voltage regulator that can deliver precision, stable power supply to various power management systems.

Features

The TPS77433DGKRG4 features very low dropout voltage, adjustable output voltage, and an excellent line/load response, so that it can easily meet the power supply requirements of power-sensitive applications. It also provides fault protection with an active current-limiting feature to protect it from short-circuit, and over-temperature protection to protect it from thermal runaway.

The TPS77433DGKRG4 linear voltage regulator has a wide input voltage range of 2.2 V to 5.5 V, and can deliver output voltages as low as 0.75 V with a maximum operating current of 150 mA. It also features low temperature coefficient and an input/output voltage accuracy of ± 0.4 %.

Application Fields

Being a low-dropout (LDO) linear voltage regulator, the TPS77433DGKRG4 is ideal for many power-sensitive applications, such as portable electronic devices and embedded systems. With its adjustable output voltage and low quiescent current, it can effectively provide power supply for a wide range of applications, such as:

• Wireless or portable device applications
• Battery-operated and low-power system applications
• GPS receiver, wifi and Bluetooth modules
• LCD and OLED displays
• Smartphone and tablet applications
• Automotive and industrial systems

Working Principle

The TPS77433DGKRG4 is a linear voltage regulator with CMOS technology, in which the output voltage is set by a PMOS transistor connected between the output and ground. A feedback circuit consisting of an error amplifier, a resistor divider and a comparator is used to adjust the output voltage to the desired voltage.

When the regulated voltage is below the reference voltage, the error amplifier output goes high, which turns on the PMOS transistor, increasing the current flow through it. This increases the output voltage until it reaches the reference voltage, and the PMOS transistor remains closed until the output voltage is again below the reference voltage.

The output voltage is also affected by the load current, supply voltage and ambient temperature. The TPS77433DGKRG4 has an active current-limiting feature to protect against short-circuit condition. It also has an over-temperature protection to prevent self-heating and thermal runaway.

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