FAN5355UC00X

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The FAN5355UC00X is a monolithic synchronous DC-DC buck converter designed for low voltage load applications. It is available in a No-Lead 6-pin TSOT package and provides up to 1.2A continuous output current at 4.5V to 17V input voltage. This device includes an internal compensation circuit and operates with a frequency up to 1.2MHz. The FAN5355UC00X is ideal for low-power load applications such as portable audio players, PDAs, cameras, cell phones and other battery-powered applications.

Application Field

The FAN5355UC00X DC-DC converter is ideal for applications requiring a low output voltage and wide input voltage range. It is capable of converting input voltage ranging from 4.5V to 17V to an adjustable output voltage of 0.725V to 12V. Its low output voltage and low Iq (1µA) makes it well suited for low-power loads such as application processors, memory devices and digital signal processors.

This device also features an average current control mode (ACCM) which allows it to operate in a constant current mode. It is well suited for DC-DC converters supplying multiple outlets (workloads) of varying current demands. Incorporating a digital core enables the ability to dynamically change the output voltage and current without the need for external circuitry.

Working Principle

The FAN5355UC00X works by regulating the current that passes through the inductor. When the load current is in excess of what the DC-DC converter is capable of delivering, the inductor current is maintained at a steady level through the device’s internal current limit circuitry. The internal control loop will then adjust the switching frequency or the duty cycle of the internal switch to regulate the output voltage.

The FAN5355UC00X also provides an automatic external compensation circuit, which enables it to follow the desired input voltage over a wide range of temperatures. This device includes an enable pin that can be used to enable/disable the device to regulate the output voltage more accurately. The FAN5355UC00X also includes an adjustable soft start function that can be used to reduce the inrush current to the load and ensure smooth power up.

Advantages of FAN5355UC00X

• Wide input voltage range of 4.5V to17V
• Output voltage adjustable from 0.725V to 12V
• Low Iq (1µA)
• Average current control mode (ACCM) for supplying multiple outlets with varying demands
• Automatic external compensation circuit to follow the desired input voltage and temperature range
• Includes an enable pin for enhanced output voltage regulation accuracy
• Adjustable soft start function to reduce the inrush current and ensure smooth power up

Conclusion

The FAN5355UC00X is a monolithic synchronous DC-DC buck converter designed for low voltage load applications. It is perfectly suited for applications requiring a low output voltage and wide input voltage range. This device is capable of converting input voltage ranging from 4.5V to 17V to an adjustable output voltage of 0.725V to 12V and is ideal for low-power loads such as application processors, memory devices and digital signal processors. This IC features an internal compensation circuit, an enable pin and adjustable soft start function, all providing great flexibility and performance.

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