LM3489MMX/NOPB

Introduction

The LM3489MMX/NOPB is a monolithic integrated circuit (IC) used for DC/DC converter applications. It is a highly integrated device that provides a wide range of features, including output voltage range, adjustable in-rush current limiting and under-voltage lockout.

Application Field

The LM3489MMX/NOPB can be used as either a synchronous step-down controller or a step-up controller. It also offers a wide input voltage range of up to 36V, making it suitable for automotive, telecommunications, industrial, medical and consumer applications. It is a high-performance controller designed to precisely regulate output voltages to tight tolerances, so it is well-suited for applications such as power management, battery charging, and adaptive charging.

Working Principle

The LM3489MMX/NOPB works on the principle of a buck-boost converter. It works in the same manner as an ordinary buck regulator, with the additional step of \'boosting\' the output voltage when the input voltage is lower than the desired output voltage. This allows the LM3489MMX/NOPB to maintain the required output voltage in both low- and high-input voltage environments. The LM3489MMX/NOPB offers two methods of adjustable in-rush current limiting: a resistor across the ENABLE pin and a programmable current limit resistor. The output voltage is adjustable using a resistive divider and is controlled by a single external resistor. Under-voltage lockout can be programmed to protect against voltage dips.

Conclusion

In summary, the LM3489MMX/NOPB is a versatile and powerful IC for DC/DC converters that can be used for a variety of applications. It offers a wide range of features, such as adjustable input voltage range, adjustable in-rush current limiting and under-voltage lockout, as well as precise output voltage control. The LM3489MMX/NOPB is an example of a DC/DC controller that demonstrates the importance of precise voltage regulation in modern applications.