FAN7601BG

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Power management integrated circuits (PMICs) play an important role in the construction of electronic devices. At the heart of their design is a capability to convert energy from one form to another. Power conversion enables efficient use of energy and provides power control of variable voltage and current such as the FAN7601BG application field and working principle.

FAN7601BG Application Field

The FAN7601BG is a low-cost, high efficiency, synchronous, Quasi-Resonant (QR) boost converter. It is designed to power a variety of applications like Bluetooth headset, cordless telephone, charger, and other portable applications where a low cost solution is needed. It has a 0.4V to 6.8V input voltage range, a 1.5A maximum load switch current in standby, and a 16V maximum output voltage. Its efficiency is very high, achieving 94% at full load with a 1.5MHz switching frequency.

The key features of the FAN7601BG include overvoltage protection, current-mode control to reduce noise, configurable soft start, an on/off control pin, and multiple clock select pins to allow flexible programming to support multiple operating frequencies. The device also includes a built-in overcurrent protection, enabling the device to automatically power down in extreme conditions. This can help enhance product reliability. The device also has a thermal shutdown feature which prevents it from operating at high temperatures, protecting against thermal runaway.

The FAN7601BG is well-suited to many types of applications such as mobile phones, digital cameras, Point-of-Sale (POS) terminals, smart meters, computers, TV-box, IP cameras, medical applications and many other low-power applications. The device is also very small in size, making it an ideal choice for applications where space is at a premium.

FAN7601BG Working Principle

The FAN7601BG provides a high efficiency synchronous boost power conversion. It is a two-stage circuit composed of two synchronous buck converters, namely an input buck converter and an output buck converter. The input buck converter functions as a step-down converter to reduce the input voltage to a desired level. The output buck converter then converts this reduced voltage to the high voltage desired by the circuit. The two converters work together to convert the input voltage to a regulated voltage output.

At the input, the input buck converter is pulse-width modulated (PWM) to adjust the duty cycle of the current through the power switch. This duty cycle determines the output voltage. The duty cycle is adjusted to keep the output voltage at the desired level, this is known as voltage mode control. The duty cycle and switching frequency are extremely important in determining the efficiency of the power conversion.

The output buck converter is controlled by voltage mode control. This regulates the output voltage to the desired level. The output is also protected against short circuit and overcurrent conditions. The output buck converter also acts as a low-pass filter, which limits the harmonic content of the output voltage. This allows the output voltage to be rated at its maximum voltage rating, providing a reliable power source.

The FAN7601BG also includes various safety features that ensure the safety of the power conversion circuit. These include overvoltage protection, current-mode control to reduce noise, configurable soft start, an on/off control pin, and multiple clock select pins to allow flexible programming to support multiple operating frequencies.

Conclusion

The FAN7601BG is an excellent choice for low-cost, high efficiency, synchronous, QR boost converter applications. It provides a broad range of features and high efficiency, making it ideal for a wide variety of applications. Its wide input voltage range and high output voltage rating make it a very versatile device. It is also very small, making it a great choice for applications where space is at a premium. Finally, its range of built-in protection features ensures that the device is reliable and safe to use.

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