FAN7317BMX

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FAN7317BMX Application Field and Working Principle

FAN7317BMX is a Power Management Specialized Integrated Circuit (PMIC) from Fairchild Semiconductor. This application note provides an overview of the device, its application field and working principle.

Overview of FAN7317BMX PMIC

The FAN7317BMX is designed for application in the automotive, industrial, and consumer markets. It combines power switching and power conditioning functions in a single 7mm x 7mm, 30-pin TSSOP package. The device\'s dual output converters enable power supply applications requiring isolated and configurable/programmable voltage outputs.

The FAN7317BMX PMIC provides dual isolated converters, configurable output voltage, differential output regulation setup, and fine current tuning. It can be used for multi-rail voltage conversion, power conditioning and supply regulation.

Application Field of FAN7317BMX PMIC

The FAN7317BMX PMIC is suitable for a wide range of applications, from automotive, industrial, and consumer applications. The dual converter design supports driving multiple outputs with maximum current of 2A (each). The output voltage can be adjusted within the range of 0.8V-5.5V with a configurable constant voltage (CV) and constant current load regulation characteristics.

The device can be used in automotive industry for engine control units, brake and control systems, navigation systems, back-up lights control, etc. In industrial market, the FAN7317BMX can be used in battery management systems, and other industrial control systems. It is also suitable for various battery charging applications. In consumer market, the device can be used for power supply regulation for LED lighting, Bluetooth and WiFi modules, smart phones, tablet and laptop adapters, and other portable electronics.

Working Principle of FAN7317BMX PMIC

The FAN7317BMX PMIC is based on a dual converter topology, with a low dropout (LDO) regulator providing a regulated output voltage from a wide supply voltage range. It is composed of a boost converter driver, a synchronous buck regulator driver, and two low dropout (LDO) regulators. The boost converter provides higher output voltage than the input voltage, and the buck converter provides lower output voltage.

The device starts with a low output voltage, configured through an external resistor. As the load increases, the output voltage is increased up to 5.5V. The output voltage of the LDOs (0.8V to 5.5V) is programmed through an external resistor. The device operates in a differential output regulation setup, with a power good / power bad pin indicating the power supply status and load regulation.

The FAN7317BMX PMIC is designed to deliver high efficiency. The device operates with a switching frequency up to 400kHz and uses synchronous rectification for higher efficiency at low load. It also features a power save mode for reduced current consumption and extended battery life.

Conclusion

The FAN7317BMX PMIC from Fairchild Semiconductor is a dual converter integrated circuit, suitable for automotive, industrial and consumer applications. This power management device combines multiple functions in a single package, such as dual converter inside, configurable output voltage, differential output regulation setup, and fine current tuning, for efficient power regulation. It offers high efficiency, extended battery life and power save mode.

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