News
2026.07.14
The high-voltage, high-current dual-input power MUX FA7666 with electronic fuse protection function goes on the market
Hsinchu, July 14, 2026 -- Fortune Advanced Technology today launched its high-voltage, high-current dual-input power MUX FA7666 with electronic fuse protection function
The 36V power MUX product series of Fortune Advanced Technology includes the FA7643 and FA7666. FA7666 is used to select and switch between two input power paths to a single output, making them ideal for systems with multiple power supplies. These power MUXes support various protection functions required for circuit protection in the power paths, such as overvoltage protection and overcurrent protection. For more information, please refer to “Home > Products > eFuse > 36V eFuse”.
The most significant feature of this IC is that it can be used repeatedly.
Conventional thermal fuses (glass tube fuses and chip-type fuses) protect power line circuits by fusing the built-in alloy parts due to Joule heat when the current exceeds the rated value. However, these thermal fuses have some shortcomings, such as slow fusing time, indefinite breaking current, and the need for replacement work once they are broken. Unlike conventional fuses, electronic fuses have a fast current blocking function, because the built-in MOSFET is quickly turned off when excessive current flows. Based on the above reasons, they will not be destroyed by a single overcurrent event and can be reset and reused. Therefore, these products can reduce maintenance costs and shorten repair time.
The second feature is that FA7666 also merges various protection functions such as overvoltage protection, over-temperature protection, and short-circuit protection. When overvoltage, severe overheating or unexpected short-circuit occurs, it can immediately cut off the power.
The third feature is that FA7666 achieves much simpler circuit designs with fewer components and a smaller PCB board area than discrete components.
The fourth feature is that FA7666 can be used in an ultra-wide power supply input voltage range of 4.5V to 30V, and the absolute maximum ratings of the input/output voltage are up to 36V.
The fifth feature is that the FA7666 is a low RDS(ON) power MUX, with each power path capable of carrying a continuous high current of up to 5A.
The sixth feature is that the overcurrent threshold can be set by an external resistor, which is more accurate than a thermal fuse.
The seventh feature is that the overvoltage threshold can be set through an external resistor to prevent excessive voltage from being applied to the load.
The eighth feature is that FA7666 provides an open drain output to signal warnings when overcurrent protection, overvoltage protection, short circuit protection, reverse current protection, or over-temperature protection is triggered.
The ninth feature is that FA7666 provides open-drain power good indicator output to notify the next-stage power supply that its output voltage has reached the normal level.
The tenth feature is that it provides a reverse current blocking function when the FA7666's power path is disabled, and a reverse current protection (RCP) function when the FA7666's power path is enabled. The power switch of each FA7666's power path consists of 2 back-to-back cascaded N-channel MOSFETs. When the power switch is turned off, the back-to-back cascaded body diodes of MOSFETs can prevent current from the output port to the input port, this is the reverse current blocking function; When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7666 will turn off the power path immediately, this is the reverse current protection function.
The eleventh feature is that FA7666 integrates a Fast Role Swap (FRS) function. When the output voltage of the power path drops from more than 50mV above the input voltage to below the input voltage, the rise time of the soft start is shortened, and the power path will turn on immediately within 100μs. This is suitable for power MUX applications that require a low output voltage drop when switching power paths.
Combining the above superior features, this series of products can provide robust protection for electronic devices such as Industrial PCs, laptop computers, battery management systems (BMS), and multi-power systems.
This product lineup provides auto-retry type of products, that is, the power path recovers the circuit by itself. The power switch periodically performs soft start process until the overcurrent protection condition is removed.
Package and availability
The FA7666 is now available through authorized distributors in the QFN5x5-32L package. Full and custom quantity reels are available.
About Fortune Advanced Technology
Fortune Advanced Technology Co., Ltd. was established in 2013 focusing on high-voltage mixed-signal power management solutions. We dedicate to meeting the emerging requirements for lower power consumption at the standby stage.
We have successfully developed the first application-oriented PMIC for TV/Monitor TV/STB applications.
It is a digitally controlled multichannel PMIC capable of achieving total 0.15Watt standby power consumption under 230VAC for the whole TV system, which is at the forefront of the IC design industry. Based on this technology, we have successively developed diverse and competitive products widely used in LCD TV, motherboards/AIO, networked communication devices/STB, notebooks computers, and other fields.
We hope to grow into the best power partner to provide high-efficiency and cost-effective power solutions to our customers. Aware of the adverse effects of global warming, we will continue to strive for energy saving.
Trademarks
All registered trademarks and other trademarks belong to their respective owners.
SOURCE Fortune Advanced Technology
The 36V power MUX product series of Fortune Advanced Technology includes the FA7643 and FA7666. FA7666 is used to select and switch between two input power paths to a single output, making them ideal for systems with multiple power supplies. These power MUXes support various protection functions required for circuit protection in the power paths, such as overvoltage protection and overcurrent protection. For more information, please refer to “Home > Products > eFuse > 36V eFuse”.
The most significant feature of this IC is that it can be used repeatedly.
Conventional thermal fuses (glass tube fuses and chip-type fuses) protect power line circuits by fusing the built-in alloy parts due to Joule heat when the current exceeds the rated value. However, these thermal fuses have some shortcomings, such as slow fusing time, indefinite breaking current, and the need for replacement work once they are broken. Unlike conventional fuses, electronic fuses have a fast current blocking function, because the built-in MOSFET is quickly turned off when excessive current flows. Based on the above reasons, they will not be destroyed by a single overcurrent event and can be reset and reused. Therefore, these products can reduce maintenance costs and shorten repair time.
The second feature is that FA7666 also merges various protection functions such as overvoltage protection, over-temperature protection, and short-circuit protection. When overvoltage, severe overheating or unexpected short-circuit occurs, it can immediately cut off the power.
The third feature is that FA7666 achieves much simpler circuit designs with fewer components and a smaller PCB board area than discrete components.
The fourth feature is that FA7666 can be used in an ultra-wide power supply input voltage range of 4.5V to 30V, and the absolute maximum ratings of the input/output voltage are up to 36V.
The fifth feature is that the FA7666 is a low RDS(ON) power MUX, with each power path capable of carrying a continuous high current of up to 5A.
The sixth feature is that the overcurrent threshold can be set by an external resistor, which is more accurate than a thermal fuse.
The seventh feature is that the overvoltage threshold can be set through an external resistor to prevent excessive voltage from being applied to the load.
The eighth feature is that FA7666 provides an open drain output to signal warnings when overcurrent protection, overvoltage protection, short circuit protection, reverse current protection, or over-temperature protection is triggered.
The ninth feature is that FA7666 provides open-drain power good indicator output to notify the next-stage power supply that its output voltage has reached the normal level.
The tenth feature is that it provides a reverse current blocking function when the FA7666's power path is disabled, and a reverse current protection (RCP) function when the FA7666's power path is enabled. The power switch of each FA7666's power path consists of 2 back-to-back cascaded N-channel MOSFETs. When the power switch is turned off, the back-to-back cascaded body diodes of MOSFETs can prevent current from the output port to the input port, this is the reverse current blocking function; When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7666 will turn off the power path immediately, this is the reverse current protection function.
The eleventh feature is that FA7666 integrates a Fast Role Swap (FRS) function. When the output voltage of the power path drops from more than 50mV above the input voltage to below the input voltage, the rise time of the soft start is shortened, and the power path will turn on immediately within 100μs. This is suitable for power MUX applications that require a low output voltage drop when switching power paths.
Combining the above superior features, this series of products can provide robust protection for electronic devices such as Industrial PCs, laptop computers, battery management systems (BMS), and multi-power systems.
This product lineup provides auto-retry type of products, that is, the power path recovers the circuit by itself. The power switch periodically performs soft start process until the overcurrent protection condition is removed.
Package and availability
The FA7666 is now available through authorized distributors in the QFN5x5-32L package. Full and custom quantity reels are available.
About Fortune Advanced Technology
Fortune Advanced Technology Co., Ltd. was established in 2013 focusing on high-voltage mixed-signal power management solutions. We dedicate to meeting the emerging requirements for lower power consumption at the standby stage.
We have successfully developed the first application-oriented PMIC for TV/Monitor TV/STB applications.
It is a digitally controlled multichannel PMIC capable of achieving total 0.15Watt standby power consumption under 230VAC for the whole TV system, which is at the forefront of the IC design industry. Based on this technology, we have successively developed diverse and competitive products widely used in LCD TV, motherboards/AIO, networked communication devices/STB, notebooks computers, and other fields.
We hope to grow into the best power partner to provide high-efficiency and cost-effective power solutions to our customers. Aware of the adverse effects of global warming, we will continue to strive for energy saving.
Trademarks
All registered trademarks and other trademarks belong to their respective owners.
SOURCE Fortune Advanced Technology