TPS77825DR

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TPS77825DR Application Field and Working Principle

The TPS77825DR voltage regulator is part of the Texas Instruments TPS77xxx series of PMIC (Power Management Integrated Circuit) linear regulators, which deliver low-noise voltage up to 5.5V to microprocessors and other digital loads in those applications where space is at a premium. The TPS77825DR regulators can supply up to 800mA of continuous output current and are able to survive transients up to 3A. It is suitable for use in notebook computers, communications equipment, and office automation.

Specifications

Input voltage range: 2.7V to 5.5V; Output voltage range: 0.8V to 5.5V; Output current limit: up to 800mA; Load regulation: better than 5mV; Ripple rejection: -60dB; Quiescent current: 25μA; Enable operating voltage range: 2.7V to 5.5V; Shutdown current: typically 0.5μA; Over temperature protection; Short circuit protection; Input float voltage: 95mV; Thermal shutdown.

Applications

The TPS77825DR voltage regulator is suitable for use in a wide range of applications, including notebook computers, communications equipment, and office automation which require the delivery of reliable power and battery management. Examples include: GPUs, FPGAs, and high speed processor cores, as well as supporting digital I/O, power-hungry memory ICs, etc.

Architecture

The TPS77825DR voltage regulator includes a control loop and an output stage. The control loop uses a two-stage amplifier and error programming with an adjustable power amplifier. The power amplifier utilizes a dedicated loop compensation network that combines resistors, capacitors, and an ideal diode bridge to ensure fast transient response and low output noise. The error programming is implemented by means of an input voltage sense resistor, which is used to adjust the operating current in the regulator.

Advantages

The TPS77825DR voltage regulators have various benefits, some of which include:

• low noise, low quiescent current;
• thermal protection and short circuit protection;
• up to 800mA output current;
• low load regulation, e.g. better than 5mV;
• high ripple rejection of -60dB;
• high stability and fast line and load transient response;
• low input float voltage of 95mV;
• input voltage range from 2.7V to 5.5V;
• output voltage range from 0.8V to 5.5V.

Conclusion

The TPS77825DR voltage regulators are suitable for a wide range of applications, due to their low noise, low quiescent current, high current output, and high ripple rejection. They are also easy to use and feature an adjustable power amplifier and an input voltage sense resistor which can be used to adjust the operating current in the regulator. Additionally, they provide thermal protection and short circuit protection.

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