SC4806MLTRT

Introduction

SC4806MLTRT is a highly integrated DC-DC switching controller. It is specifically designed for step-down DC-DC applications with low voltage, high output current and low quiescent current requirements. The device contains a wide input range, PWM control, internal compensation, high side and low side MOSFET drivers, fast over-current protection, soft-start and power good features.

Application Field

The SC4806MLTRT can be used in many different applications such as:

• Automotive electronics
• Client and server computers
• Battery backup systems
• Industrial and medical equipment
• Networking and communication equipment
• Portable and embedded devices

Its wide range of input voltages (6V to 36V) and adjustable output voltage (0.8V to 6V)allow for various design choices. The device integrates all of the necessary components to provide an optimal power solution for step-down DC-DC applications. It operates at a switching frequency of 1.25MHz and can provide an output current of up to 10A.

Working Principle

The SC4806MLTRT consists of three main blocks: the power stage, the power management controller and the control logic. The power stage includes the high side and low side MOSFET drivers with their associated input/output filtering. It is responsible for the actual power conversion and loads/ultra-low ripple regulation. The power management controller is responsible for monitoring and controlling the output voltage and provides error correction, over-current protection and other functions. It is also responsible for monitoring the output current and controlling the soft-start feature. Lastly, the control logic block is responsible for generating the PWM control signal, switching the drivers and controlling the loop response.

The device works in a Hysteretic Control Mode, and the control loop is responsible for tracking the operating point of the power stage and for making sure that the load is supplied with the desired output voltage. The duty cycle (D) of the PWM signal is adjusted until the output voltage equals the set point. The Hysteretic Control Mode also allows for a constant switching frequency and minimizes switch oscillations. The device provides fast transient response, excellent steady state accuracy and takes into account load and line regulation.

Conclusion

In conclusion, the SC4806MLTRT is a highly integrated DC-DC switching controller with a wide operating range and suitable for various applications. Its wide input range (6V to 36V), adjustable output voltage (0.8V to 6V), internal compensation, high side and low side MOSFET drivers, fast over-current protection, soft-start and power good features make it an ideal choice for step-down DC-DC applications. Its Hysteretic Control Mode also provides fast transient response, excellent steady state accuracy and takes into account load and line regulation.