Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

PMIC - Voltage Regulators - DC DC Switching Regulators

LT8643SEV#PBF Application Field and Working Principle

The LT8643SEV#PBF is a synchronous buck regulator integrated circuit developed by Linear technology, providing a cost-effective solution for portable electronics and other applications requiring efficient regulation of current. The device integrates a PMOS power switch, an NPN driver transistor, a synchronous MOSFET switch and an adjustable constant current output stage.

Application Fields

• Mobile computing.
• Smart watches.
• GPS systems.
• Battery-powered electronics.

Working Principle

To regulate the output current, the LT8643SEV#PBF uses a voltage controlled PWM (VCPWM) technology. A voltage reference controls the duty cycle of the pulse width modulated (PWM) signal, thus modulating the output current. The device implements drain-source current sensing to measure the output current and a voltage reference to set the output current limit. For higher current resolution and higher efficiencies, the device supports synchronous rectification.

The LT8643SEV#PBF also utilizes an Adaptive Frequency Modulation (AFM) control scheme, which automatically adjusts the operating frequency to optimize the efficiency of the regulator. The AFM mode can be used with fixed frequency operation, enabling the device to switch between the two modes. This feature reduces system noise and improves light load efficiency.

The LT8643SEV#PBF is also capable of implementing skip mode operation, where the regulator is turned off to save power when the load draws low current. The device features an adjustable soft start for reducing in-rush current on the power supply. It can be configured for power sequencing using an external transistor.

Conclusion

The LT8643SEV#PBF provides an efficient and cost-effective solution for application requiring high-current regulation, such as mobile computing, smart watches, GPS systems, and other battery-powered electronics.

The specific data is subject to PDF, and the above content is for reference