FDD6778A Discrete Semiconductor Products

FDD6778A is a DC-DC synchronous step-down power conversion integrated circuit. It is a single general-purpose, non-synchronous rectification and independent synchronous rectification buck power supply integrated circuit with a variety of process and protection functions.

The FDD6778A is generally used as the power supply for mobile applications such as tablets, laptops, mobile phones, digital products, hand-held instruments, cameras, and so on. It can also be used as the power management module of an embedded system, such as an industrial control system, a communications system, and a navigation system.

FDD6778A integrates rectification, integrated synchronous rectification with ultra-high speed switching of MOSFETs, voltage regulator, current balancing, overshoot protection, safety protection, frequency synchronization, and other functions on a single chip. Compared with the traditional discrete MOSFET, small power inductor and charging circuit, it has the advantages of low quiescent current, small footprint, and high power-saving efficiency.

The working principle of the FDD6778A is to use the switch tube to switch the power supply voltage, while the voltage stabilizing circuit is used to maintain the output voltage in a constant state. The voltage is converted by the switch tube into two parts: the output voltage is fed back to the control chip through the sampling circuit, and its voltage regulator chip is used to control the switch tube\'s switching speed so that the output voltage is kept constant at a certain voltage.

In addition, the FDD6778A also has many other functions such as constant current limiting, thermal protection, short circuit protection, frequency synchronization, etc. In order to ensure the normal operation of the FDD6778A and the safety of the device, these functions are integrated on the chip to monitor the chip and take responsive actions according to the changes of the working conditions, so as to ensure the correct operation.