LT8708HUHG-1#PBF

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Overview of LT8708HUHG-1#PBF Application Field and Working Principle

The LT8708HUHG-1#PBF is a DC-DC switching controller designed to regulate output voltage of an adjustable voltage output power supply. The DC-DC switching controller utilizes a proprietary architecture to provide a high-efficiency, low-cost solution with minimal parts count. It is designed to drive the low side MOSFET in a synchronous buck converter, making it suitable for cost-sensitive, high-demand applications.

LT8708HUHG-1#PBF Features：

• Wide input voltage range from 4.5V to 60V.

• 1.2A continuous switch current.

• 55.4mR maximum on resistance for both low side and high side MOSFET.

• Precise output voltage regulation accuracy of 1.5%.

• Programmable current limit.

• Integrated 100mA gate driver for both MOSFETs.

Application Field：

The LT8708HUHG-1#PBF is suitable for use in cost-sensitive, high-demand applications such as notebook computers、LCD monitors、dual-mode adapters、non-isolated power supplies, automotive lighting, and other DC-DC switching power supplies.

Working Principle：

The LT8708HUHG-1#PBF controllers are designed to drive the synchronous buck converter in a typical two-switch buck converter topology, as shown below. The LT8708HUHG-1#PBF provides the control signals for the high side and low side MOSFETs, and the current sense circuit senses the current flow through the low side MOSFET. The LT8708HUHG-1#PBF monitors the output voltage, and adjust the duty ratio of the switching cycle as needed to keep the output voltage at the programmed level. It also features current limit protection by sensing the current flow through the low side MOSFET. The current limit setting can be adjusted externally with a resistor.

The LT8708HUHG-1#PBF has many different algorithms and robust protection features to ensure reliable, safe operation. It has built-in thermal shutdown protection, overvoltage protection, and input undervoltage protection. It also has cycle-by-cycle current limit protection, as well as soft start functionality to reduce inrush current.

Conclusion：

The LT8708HUHG-1#PBF controller is a cost-effective, high efficiency alternative for a wide range of adjustable voltage output power supplies. It is suitable for use in cost-sensitive, high-demand applications such as notebook computers, LCD monitors, dual-mode adapters, non-isolated power supplies, automotive lighting, and other DC-DC switching power supplies. It features precise output voltage regulation accuracy and many protection and robust features to ensure reliable and safe operation.

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