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LM5035SQX/NOPB Voltage Regulator - Application Field and Working Principle

The LM5035SQX/NOPB voltage regulator is an integrated asymmetrical high-side and low-side driver for driving N-Channel MOSFETs manufactured by Texas Instruments. This device is classified as a DC-DC Switching Controller and is specifically designed for synchronous buck boost (VIN-VOUT) applications. The device is targeted for use in Vcore, MEMcore, I/O and other point-of-loads (POL) voltage regulator designs. The switching frequency is programmable through an external pin, resulting in minimal external component solutions.

Application Field

LM5035 is ideal for voltage regulation in various applications such as advanced server and storage, consumer digital applications and industrial applications. The regulator can also be used in automotive applications on safety and non safety critical systems and systems where wide input (e.g 12V or 24V) voltage range solutions are demanded. In addition, the regulator is a great alternative to linear regulators and provides superior performance for very small and tight space applications in terms of efficiency and heating dissipation.

Device Features

The LM5035SQX/NOPB controller offers the following features:

• 3.3V to 28VVIN range.
• External adaptive overshoot compensation.
• Integrated bootstrap diode for high side MOSFET operation.
• Constant frequency current mode operation.
• Programmable switching frequency up to 1MHz.
• Integrated programmable dead time.
• Two external resistors sense the current of both switch.
• Integrated SKIP mode to improve light load efficiency.
• Integrated cycle-by-cycle peak current limit.
• Programmable Over Voltage Protection.
• Integrated soft start for output voltage ramp up.
• Protection for under voltage lock out (UVLO), over temperature shut down, and over current protection.

Block Diagram

Working Principle

The LM5035SQX/NOPB controller works in a constant frequency current mode to regulate the output voltage. During each switching cycle of the power switch, the IC\'s sense resistor senses the current flowing in the switch. The LM5035SQX/NOPB then drives the switch on and off using its internal oscillator, so that the voltage across the sense resistor matches the reference voltage generated from its internal Error Amplifier (EA). This method of Current Mode Control also allows the LM5035SQX/NOPB to have fast transient responses, good loop stability, and high efficiency.

The inductor current of the regulated output is sensed with an external low resistance sense resistor (RS) connected between the LW and SW pins of the IC. The IC then controls the power switches (Q1/Q2) to maintain a constant output voltage by adjusting the on/off times of the power switches. The IC uses a high side N-Channel MOSFET (Q1) and a low side N-Channel MOSFET (Q2) to regulate the output current. The LM5035SQX/NOPB also provides protection features such as internal protection for overload, short circuit, overheating, and under voltage lockout (UVLO).

Conclusion

The LM5035SQX/NOPB voltage regulator is a highly integrated DC-DC switching controller from Texas Instruments. It is suitable for use in a variety of applications needing a wide input voltage range, including automotive and industrial applications. The LM5035 offers excellent performance in terms of efficiency and heating dissipation, and it provides a variety of protection features for overload, short-circuit, over-heating, and under-voltage lockout. By using constant frequency current mode control, the LM5035SQX/NOPB can provide excellent transient performance and loop stability, allowing for high efficiency operation.

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