LM5020SD-2/NOPB

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LM5020SD-2/NOPB is an advanced DC-DC switching controller integrated circuit (IC) made by Texas Instruments (TI), which is used in many applications and builds on strong performance and reliability. It is part of TI’s PMIC – Voltage Regulators – DC DC Switching Controllers. The LM5020SD-2/NOPB device is mainly used to control the power delivery of high power, high side DC/DC converters that are used in various applications such as automotive, white goods, telecom and automotive battery management systems.

Key Features

• Integrated low RDS(ON) high side p-channel MOSFET.
• Wide input voltage operating range from 4V to 80V.
• High efficiency up to 97%.
• 500ns typical propagation delay time.
• Adaptive gate bias supply.
• Soft switching of output switch.
• Integrated slow start circuit.
• Presence of integrated 5V linear regulator.
• High light load efficiency.
• Precise current limit, under-voltage lockout, over-voltage protection, thermal shutdown.

Working Principle

The LM5020SD-2/NOPB IC is designed to provide a simple solution for controlling the power delivery from a high voltage, high power DC/DC converter and is commonly used in automotive and battery management systems. The LM5020SD-2/NOPB is made up of two main components: an adaptive gate bias supply and an integrated low RDS(ON) high side p-channel MOSFET. The adaptive gate bias supply generates an adjustable gate bias voltage in response to the output voltage of the DC/DC converter. This voltage is then used to control the current flow through the integrated MOSFET. The series connection of the gate bias supply and the MOSFET creates a voltage divider which determines the peak current passing through the switch.

The Integrated MOSFET is responsible for switching the output. It turns ON and OFF depending on the gate voltage generated by the adaptive gate bias supply and the RT pin voltage. The RT pin is used to set the output voltage of the converter. As the RT pin voltage rises, the ON-resistance of the MOSFET decreases and the current flow through it increases which in turn raises the output voltage of the converter. The LM5020SD-2/NOPB IC also provides an integrated slow start circuit for powering up the IC, a 5V linear regulator for powering the internal circuitry, a current limit circuit for limiting the maximum current, a thermal overload protection circuit to protect the IC from overheating and an under-voltage lockout circuit to prevent it from malfunctioning.

Conclusion

The LM5020SD-2/NOPB IC is an advanced integrated circuit that provides a powerful and reliable solution for controlling high power, high side DC/DC converters. It features a wide input voltage range, high efficiency, precise current limit, under-voltage lockout, over-voltage protection, thermal overload protection and integrated slow start circuit. Its integration of low RDS(ON) high side p-channel MOSFET and adaptive gate bias supply together with its highly efficient and precise control of power delivery make it ideal for use in automotive and battery management systems.

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