A6985F

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The A6985F is a DC-DC switching regulator that is part of the Advanced Power Management (PMIC) family of voltage regulators. This voltage regulator can handle up to 5A of output current with a maximum operating input voltage of 28V. It provides a wide range of protection features, ensuring optimal device operation and protection of the system from overvoltage, overcurrent, and overtemperature conditions.

Features

• Input voltage range: Up to 28V
• Output current range: Up to 5A
• Fixed-frequency PWM control
• Modern Slope Compensation
• AEC-Q100 qualified
• Selectable current limit
• Integrated overtemperature shutdown
• Integrated overvoltage protection
• Undervoltage lockout protection
• Thermal shutdown

Applications

• Automotive power applications
• Industrial equipment
• Portable devices
• Power converters
• Telecom and networking

Working Principle

The A6985F is based on a PWM-based buck (step-down) converter topology. This means that the output voltage is regulated by modulating the duty cycle of an output switch in order to drop the input voltage to a set level. The voltage then passes through an inductor before it is outputted. The output of the inductor is then coupled to the output capacitors through a low-value resistor. In this way, the output voltage can be regulated via the current limit circuit and PWM control.

The A6985F features a modern slope compensation technique (MSS) to provide fast response and improved loop stability. This feature allows the switching regulator to respond to any step changes in voltage and current with improved accuracy and efficiency. The A6985F also includes under-voltage lockout (UVLO) and overtemperature shutdown (OTS) protection to ensure safe and reliable operation.

The device uses a low gate charge MOSFET in the output stage and is designed to work with a wide range of input and output capacitors. The device has an adjustable switching frequency (200kHz to 2.4MHz) and the overall output ripple can be further minimized by adding a small output capacitor.

Conclusion

The A6985F is a flexible and reliable DC-DC switching regulator that is ideal for automotive power applications, industrial equipment, portable devices and other power conversion applications. The device features modern slope compensation, adjustable switching frequency and a wide input and output voltage range, making it easy to design a power solution that is robust and efficient. The A6985F also offers a wide range of protection features to ensure safe and reliable operation.

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