RT5797ALGQW Application Field and Working Principle

The RT5797ALGQW is an advanced DC-DC buck regulator from Richtek Technology Corporation, which is capable of providing an accurate regulated output voltage with a 0.6V reference accuracy. It is a highly integrated high-voltage PMIC that enables low quiescent current and high switching frequency, high power losses, and fast transient response. It is designed for a range of applications such as mobile computing and smartphones, automotive, industrial and medical end-market products.

The RT5797ALGQW offers one-step adjustment of the output voltage using an external resistor with a wide range of output voltages. It supports dual monitor functions for maximum efficiency, and has an active voltage scaling feature to reduce current consumption, output ripple and dynamic power dissipation. A full range of protection features are included, such as over voltage, over temperature and over-current protection.

The RT5797ALGQW works on the principle of pulse width modulation (PWM). It uses a semiconductor switch to periodically turn the load on and off at a specific frequency and duty cycle. The switch is linked to the voltage reference and a feedback loop connects the output and feedback pins together. If the voltage reference is stable, the output voltage is regulated.If the input voltage or load changes, the switching frequency, duty cycle and/or the bias current can be adjusted in order to maintain the output voltage.

The RT5797ALGQW provides a wide range of functions, including fixed and adjustable output voltages, automatic voltage scaling, high switching frequency and fast transient response, protections such as over voltage, over temperature and over-current, and programmable soft-start. Moreover, the RT5797ALGQW has a low quiescent current of just 1.8mA, and a high efficiency of up to 89%.

The RT5797ALGQW is ideal for any high voltage power supply design, as it offers high power efficiency, low ripple, fast transient response, and advanced protection features. It is designed to provide an accurate, stable and efficient output voltage with low external component count.