RT5788AGJ8F

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The RT5788AGJ8F chip offers a programmable, buck-boost electronic load switch, allowing for precise over-current, over-voltage, and over-temperature protection and isolation of loads in any system. The RT5788AGJ8F is a highly integrated, voltage-regulator-optimized, switching regulator controller designed to achieve both high efficiency and excellent power-conversion performance. The buck-boost design enables buck-mode, boost-mode, and buck-boost operation, and the integrated push-pull switch ensures a robust, low-EMI, and reliable system interface.

Function and Applications

The RT5788AGJ8F application fields include power-line conditioners, AC-DC power adapters, battery charging systems, power supplies for industrial controllers, displays, and automotive applications, and general-purpose power systems. It is suitable for applications that require high efficiency, fast response time, and dynamic over-current and over-temperature protection, such as LED driver applications, DC motor drivers, and solar inverters.

The device is designed to provide a low-losses solution that simplifies the control system and eliminates the need for costly routing and multiple traces. It also offers a high-speed interface, enabling a fast response time and thus improving regulation accuracy. Furthermore, the low-profile QFN (quad flat non-leaded) package makes it suitable for space-sensitive applications.

Working Principle

At its core, the RT5788AGJ8F operates as a switching regulator using a continuous conduction mode (CCM) operation. CCM operation relies on the inductor current being continuous, meaning that it does not increase abruptly at any point, leading to a lower output ripple voltage and higher efficiency. The chip is optimized for wide voltage operations, with specific features specifically designed to ensure optimized performance even at low input and output voltages.

The RT5788AGJ8F has a low start-up current, enables a fast transient response, provides programmable soft-start, and includes an internal soft-stop feature (to prevent the load restarting until the input voltage reaches a pre-determined level). Additionally, the device can be connected to a system’s power control state machine, allowing the RT5788AGJ8F to adjust its output voltage level according to the system’s requirements.

The integrated protection circuit provides a surge current protection, while the over-current and over-temperature protection functions are enabled via programmable over-current/over-temperature roundtrip logic. Furthermore, the integrated over-voltage protection (OVP) minimizes voltage spikes and inrush current.

Conclusion

The RT5788AGJ8F chip offers a versatile and easy-to-use buck-boost voltage regulator solution for any system requiring over-current, over-voltage and over-temperature protection. The integrated push-pull switch ensures a robust, low-EMI, and reliable system interface, while specific features optimize its performance even at low input and output voltages. The chip’s surge current protection, over-current and over-temperature protection, and over-voltage protection provide the necessary protection for system safety and reliability.

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