RT8456GE

The RT8456GE is a one-of-a-kind integrated Power Management Integrated Circuit (PMIC) for LED applications developed by Richtek Technology Corporation. This device integrates a switching regulator to provide up to 3A of current to a single-array of high-brightness-LED. The RT8456GE supports Bi-directional current monitoring and over-temperature protection mechanisms to protect the power drive circuit and the LEDs.

Applications

The RT8456GE is optimized for illuminating power-gated LEDs or light sources such as flashlights, accent lights, and even headlamps. It can be used in a variety of applications, including automotive lighting, commercial displays, entertainment applications, aviation lighting and general lighting.

The device is also capable of operating a Constant Voltage (CV) drive of an LED circuit. This feature can be used to maintain the LED brightness even when current fluctuates. Additionally, the RT8456GE is designed to withstand a wide range of input voltages, from 4.5V to 16V, which allows for maximum flexibility in driving LEDs up to 3A.

Working Principle

The RT8456GE operates on the principles of Constant Current (CC) drive and Constant Voltage (CV) drive. In the CC drive mode, the device’s internal circuitry adjusts the duty cycle of its switching regulator to maintain the current output of the LEDs at the desired level. With the CV drive mode, the device adjusts its switching regulator’s duty cycle to maintain the voltage output of the LEDs at the desired level.

In addition to its driving capability, the RT8456GE also has several safety features for protecting the LEDs and the power drive circuit. These include over-current protection and Thermal Sense Shutdown, which can be used to shut down the device in the case of over-temperature conditions. The device is also designed to withstand high voltage surges and Reverse Polarity protection.

The RT8456GE is RoHS-compliant and is available in a variety of packages, including SOT-23-5 and SOP-8. It is capable of operating at both 3.3V and 5V analog supplies.

Conclusion

The RT8456GE is a unique Power Management Integrated Circuit (PMIC) designed specifically for LED applications. It is capable of providing up to 3A of current to a single-array of high-brightness-LED, and has safety features to protect the LEDs and the power drive circuit. The RT8456GE can be used in a variety of applications, making it an ideal solution for LED lighting in automotive, commercial, aviation and general lighting applications.