LM5141RGER

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The LM5141RGER is a monolithic broad-range synchronous buck voltage regulator with both a digitally-controlled step-down converter capable of operating from 4V to 28V input voltage range VIN and a 1A integrated power switch, designed to supply a 5V or 3.3V output voltage. It greatly eases design complexity by eliminating the need to detect current mode control, while achieving excellent system-level performance, including low component count, fast transient response and good line/load regulation with low output voltage ripple. The synchronous buck voltage regulator is suitable for use in high efficiency applications that drive a wide range of power loads, such as low voltage systems powered by distributed power architectures.

The LM5141RGER is an integrated circuit solution that combines a wide input voltage range with a high switching frequency and low quiescent current. It also includes one digital control pin to select the output voltage, allowing easy selection and adaptability of the output voltage. By implementing the intelligent switching controller, it achieves excellent system performance including low component count, fast transient response, good line/load regulation, low output voltage ripple, and high efficiency.

At the input, the LM5141RGER includes an on-chip MOSFET transistor as a power switch and an on-chip voltage regulator to provide the gate voltage for the power switch. The power switch drives an inductor with the input voltage and produces an output current. At the same time, the error amplifier with the output voltage feedback produces an analog control signal, which is then compared to a programmed voltage to create the pulse width modulation waveform. This waveform is then used to control the power switch.

At the output, the LM5141RGER includes a voltage regulator to provide the necessary output voltage, either a 5V or 3.3V voltage. The voltage regulator is also equipped with a linear post-regulation stage as well as both current and thermal protection circuits. This makes it possible to provide a reliable and safe operation even in challenging operating conditions.

The LM5141RGER is an efficient, reliable buck switching controller optimized for high frequency applications. It is suitable for low-voltage supply of distributed power architectures and low voltage systems powered by a 4V to 28V input voltage, and it produces either a 5V or 3.3V output voltage, with a high level of flexibility. The extremely low quiescent current makes the LM5141RGER ideal for battery operated applications, while the advanced digitally-controlled switching topology ensures high performance under all load conditions.

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