LM5576MH

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LM5576MH is a member of DC-DC switching regulators, a type of Pulse Width Modulator (PWM) controllers manufactured by Texas Instruments. It is a high-power single-stage, synchronous step-down regulator for high-current applications. The device supports a wide range of output voltages from 0.6 V to 6 V with up to 4 A of continuous load current. LM5576MH offers an adjustable frequency that can be further improved with a resistor divider-based trim adjuster. It operates in a constant frequency current mode control with a minimum on-time of 650ns.

Features of LM5576MH

• Up to 4A peak (typical) output current
• Constant frequency current mode control
• 850nA quiescent current at full load
• Efficient integrated oscillator
• 1MHz switching frequency
• >90% efficiency
• Integrated Schottky diode
• Under-voltage lockout
• Input voltage range: 4.5V to 17V
• Output voltage range: 0.6V to 6V
• Wide load range: 0.03A to 4A

Applications of LM5576MH

• High-current buck converters
• High-current buck-derived point-of-load (POL) converters
• Signal processor power supplies
• Telecommunication systems
• Server and networking equipment power supplies
• Portable electronic devices
• Notebook computers
• Automotive applications
• Industrial process control
• Lighting control systems

Working Principle of LM5576MH

LM5576MH is a high-power single-stage, synchronous step-down voltage regulator. It uses a PWM control scheme to maintain a constant output voltage when the input voltage and load current fluctuate. It is driven by an internal oscillator, which runs at a fixed frequency of 1 MHz. The voltage regulator monitors the input voltage and the output current, and manages the switching timing of the internal MOSFETs in order to maintain a constant output voltage. The constant frequency current mode control generates high peak efficiency and maintains a tight output voltage tolerance.

Protection Features of LM5576MH

• Under voltage lockout (UVLO): This feature prevents the device from operating if the input voltage falls below a predetermined value.
• Thermal fold back: This feature reduces the switching frequency of the device in order to prevent the device and output power stage from overheating.
• Over voltage and Over current (OVP & OCP): This feature prevents the device from operating when the output voltage is higher than the OVP threshold or the output current is higher than the OCP threshold.

Conclusion

The LM5576MH is a high-power, single-stage, synchronous step-down voltage regulator specifically designed for high-current applications. It offers tight regulation, high efficiency, and superior thermal performance. With its wide input voltage range, adjustable switching frequency, integrated Schottky diode, and integrated protection features, the LM5576MH is a great choice for any high-power DC-DC application.

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