TPS79901DDCRG4

TPS79901DDCRG4 Application Field and Working Principle

The TPS79901DDCRG4 is a low-dropout (LDO) linear voltage regulator that operates from an input voltage of 0.8 V to 6.5 V. It has a Quiescent Current of 200 µA at 3.3 V and offers up to 500 mA of output current. The regulator has a ±1.3% output accuracy over line and load variations, making it ideal for precision power solutions. This device provides ultra-clean performance with a Low Power Ripple of 2 mV at 1 kHz and a Line Regulation of ±0.4%. It features X2-Mode, an ultra-low-noise alternative to Burst Mode operation for the quickest transient response, lowest operating current and the greatest power savings.

Features

• Input voltage range: 0.8 V to 6.5 V
• Output current: 500 mA
• Quiescent current: 200 µA at 3.3 V
• Output accuracy: ±1.3% over line and load variation
• Low power ripple: 2 mV at 1 kHz
• Line regulation: ±0.4%
• X2-Mode: Ultra-low-noise alternative to Burst Mode operation

Application Fields

The TPS79901DDCRG4 is used in a variety of applications, including but not limited to, cellular phones, personal digital assistants, digital cameras, MP3 players, medical equipment, power tools, automotive entertainment systems, and other battery-powered devices. The ultra-low-noise alternative to Burst Mode operation further makes it ideal for powering high-frequency digital circuitry, such as memory and microcontrollers.

Working Principle

The TPS79901DDCRG4 is a low drop-out linear LDO regulator. It works by regulating the output voltage to a predetermined level by relying on the voltage drop across a series pass element which is placed between the input and the output terminals. This series pass element is typically a PMOS (Metal Oxide Silicon) transistor or a field-effect transistor (FET). The voltage is regulated by controlling the amount of current passing through the series pass element.

The LDO regulator is designed with feedback components such as resistors, capacitors, and transistors. These components act as voltage references and control the current into the PMOS transistor, thus regulating the output voltage. By monitoring the output voltage and feeding the information back to the error amplifier, the regulator can adjust the current accordingly to maintain a constant output over a range of input voltage, temperature and load conditions.

The TPS79901DDCRG4 also features X2-Mode which operates with a minimum of 200 µA Quiescent Current (QC), reducing power consumption and, thereby, extending battery life. In X2-Mode, the regulator waits for 2 successive faults before it resumes regular operation, or for a reset or timeout condition to occur. This enables the device to instantly respond to rapid voltage transients and maintains superior noise performance.

Conclusion

The TPS79901DDCRG4 low-dropout linear voltage regulator provides ultra-clean performance and superior noise performance, making it ideal for powering high-frequency digital circuits. It offers up to 500 mA of output current and a quiescent current of 200 µA at 3.3 V. The ±1.3% output accuracy over line and load variations and the ultra-low-noise alternative to Burst Mode operations make the TPS79901DDCRG4 an excellent choice for a variety of applications, including but not limited to cellular phones, personal digital assistants, digital cameras, medical equipment, power tools, and automotive systems.