RT5797BLGQW

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RT5797BLGQW is a DC-DC synchronous buck regulator IC with integrated MOSFETs from Richtek, designed for power applications from 2V to 5.5V. This device offers superior small-area solutions in the application fields of mobile devices, home appliances, computing, and internet of things (IOT). RT5797BLGQW enables the development of cost-effective and energy-efficient power supplies with a power output range of 0.8V to 5.5V.

The RT5797BLGQW is a high-performance DC-DC synchronous buck regulator. It uses two integrated MOSFETs to provide high efficiency and the high-side MOSFET drive in one device. The device provides a switching frequency range of 200 kHz to 2.2 MHz with external compensation to optimize the system dynamic response. It also offers fast transient response, low input voltage ripple and excellent load and line regulation.

As for RT5797BLGQW’s working principle, it utilizes a constant-frequency peak current mode control to regulate the output voltage. The regulator has an internal transconductance amplifier (Gm) and error amplifier to form a voltage-mode control loop. The current sensing resistor is connected to the RT5797BLGQW’s voltage feedback pin and Gm pin. The current sensing resistor will sense the output current of the regulator, and the Gm pin will provide the feedback information to the error amplifier. The error amplifier will calculate the difference between the expected voltage and the current output voltage. Finally, the PWM comparator will be used to compare the error amplifier output with the triangle oscillator signal and forms the PWM pulses to switch the MOSFETs and control the output voltage.

Additionally, the RT5797BLGQW includes several safety features such as over-temperature protection, over-current protection and over-voltage protection. The over-temperature protection will trip at 155°C (Typ.) to keep the IC from being damaged by high temperature. The over-current protection will dictate when the output current is beyond the threshold, while the over-voltage protection will shut down the output voltage when it exceeds the threshold.

In conclusion, RT5797BLGQW is a DC-DC synchronous buck regulator IC with integrated MOSFETs from Richtek. It features superior small-area solutions in the application fields of mobile devices, home appliances, computing, and internet of things (IOT). The device utilizes a constant-frequency peak current mode control to regulate the output voltage and PWM comparator to control the MOSFETs. Additionally, the RT5797BLGQW includes several safety features such as over-temperature protection, over-current protection and over-voltage protection. Therefore, RT5797BLGQW is an excellent choice for designing cost-effective and energy-efficient power supplies.

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