MAX1971EEE

PMIC - Voltage Regulators - DC DC Switching Regulators

The MAX1971EEE is a step-down DC/DC switching regulator that comes from Maxim Integrated. It is a simple, low-cost solution for a wide range of DC-to-DC applications. The MAX1971EEE\'s constant frequency, peak current-mode architecture enable it to provide excellent dynamic response and standard-regulation accuracy over a wide line and load-transient range. With a wide 4.4 V to 32 V input range and up to 30-A output-current enabled by a low-resistance, 0.2-Ohm, N-channel MOSFET, the MAX1971EEE is an ideal solution for high-current point-of-load regulations such as distributed power systems and industrial DC/DC converters.

Applications

The MAX1971EEE can be employed in a wide range of DC/DC conversion applications, such as telecom and computing systems, distributed power systems and motor drives. Furthermore, it provides precise regulation of load voltages and excellent transient performance in a variety of high-current applications. It can provide a clean, constant-voltage output with variable switching frequency across a wide range of load currents. Also, since the MAX1971EEE is designed for peak-current mode, it does not require a sense resistor nor an external compensation network, reducing design complexity and increasing design flexibility.

Working Principle

The MAX1971EEE is a high-performance DC-DC step-down switching regulator. It utilizes peak-current-mode control to regulate an output voltage from a 4.4V to 32V input. By sensing the current (peak or average) across a single external N-channel power MOSFET, the internal controller is able to accurately regulate the output voltage regardless of changes in load or line conditions. The MAX1971EEE also features a low-current keep-out circuit to ensure the converter starts without a burst of large inrush current. In addition, the input under-voltage and output over-current protection will protect the load from any hazardous conditions.

The MAX1971EEE offers an adjustable switching frequency from as low as 400kHz to as high as 2.2MHz, which enables designers to optimize current ripple, efficiency, and EMI performance.

The MAX1971EEE also provides several user-friendly features to reduce power-supply design time. It has an adaptive-on-time control scheme that reduces switching losses and improves light-load efficiency. Its precision enable-input voltage control allows the enable threshold voltage to be adjusted for a different enable voltage level. The MAX1971EEE also comes with an accurate internal reference and can operate at warm temperatures up to 125°C for extended reliability.

Conclusion

The MAX1971EEE is a great solution for high-current applications, due to its peak-current-mode architecture and its easily adjustable switching frequency. With its wide input voltage range, accurate reference voltage, excellent load-transient performance, and user-friendly features such as enable-input control and adaptive-on-time control, the MAX1971EEE is an excellent choice for advanced power-supply designs. Additionally, its features ensure the converter will be reliable and provide the benefits of reduced design complexity, low noise, and efficient operation.