ISL6146AFUZ-T

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PMIC - OR Controllers, Ideal Diodes - ISL6146AFUZ-T application field and working principle

The ISL6146AFUZ-T is a monolithic integrated circuit intended for use in OR controllers and ideal diode applications.

Application Field

The ISL6146AFUZ-T can be used to provide OR controllers in the battery charge and power supply systems. The usage includes multi-rail clamping for OR controllers or ESD protection for OR controllers. The ideal diode capability is used for reverse blocking and series attach for step-up converters, etc. The Circuit also offers an adjustable clamping voltage range that allows the user to select a clamp voltage range ideal for the desired system voltage.

Working Principle

The ISL6146AFUZ-T is a high performance, monolithic OR controller and ideal diode comprised of two power MOSFETs, two sensing resistors and protection circuitries. Two MOSFETs are connected in a forward direction and function as an ideal diode. The OR controller controls the voltage clamping effect and recovers quickly. The output voltage is precisely clamped to the voltage level set by the internal voltage divider, which is adjusted by user-selectable external resistors.

The ideal diode provides the reverse channel blocking capability and blocks current flows in the reverse direction. The ideal diode also performs an active load when there is no voltage applied to the output. This function is useful to reduce quiescent current to maintain the ideal diode losses and therefore reduce the heat dissipation of the ISL6146AFUZ-T.

The protection circuitries in the ISL6146AFUZ-T are designed to protect the circuit from overcurrent and overtemperature. An overcurrent protection circuit monitors the voltage on the sense resistor and trips an open loop switch if the current exceeds its protection threshold. An overtemperature protection circuit is designed to monitor the device temperature and shut down the device if the temperature exceeds its protection threshold. The device also has an inrush current limit circuit that limits the inrush current during start up or fast transient events. This prevents the controller from becoming overstressed.

Conclusion

The ISL6146AFUZ-T is a monolithic integrated circuit intended for use in OR controllers and ideal diode applications. It is a high-performance, monolithic OR controller and ideal diode comprised of two power MOSFETs, two sensing resistors and protection circuitries. It can be used to provide OR controllers in the battery charge and power supply systems, and offers an adjustable clamping voltage range. It provides the reverse channel blocking capability and blocks current flows in the reverse direction. It also has an overcurrent and overtemperature protection to protect the circuit from overstressing and ensures that it operates safely.

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