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LM3489EVAL/NOPB application field and working principle

The LM3489EVAL/NOPB, an evaluation board from Texas Instruments, is used for DC/DC & AC/DC (Off-Line)SMPS (Switched Mode Power Supply) applications. This board is designed to aid engineers in understanding the functionality of the LM3489 synchronous boost controller.

Application Field

The applications of the LM3489 include:

• Transient-free ultra-low-power and low-voltage (down to 0.4V) boost applications
• Battery-based systems
• Synchronous Boost Controllers
• USB On-The-Go (OTG) applications

Features

The LM3489 evaluation board offers a wide range of features including:

• Direct 3.3V input
• Direct 5V output
• Active current sharing
• Light load efficiency optimization
• Thermal shutdown
• Input supply UVLO protection

Working Principle

The LM3489 is a synchronous boost step-up controller, designed for battery-powered devices. The LM3489 integrates two N-channel MOSFETs, reducing the amount of external components required. The LM3489 operates from an input voltage of 0.40V up to 18.0V and produces a regulated output voltage up to 80V with high efficiency. It can be used for a wide range of applications, from very low power to high power, providing an adjustable output voltage.

The LM3489 includes an enhanced Current Mode PWM controller with an adjustable frequency up to 1.2 MHz. The input voltage is regulated by the duty cycle of the output switches. The regulation of the output voltage is achieved by adjusting the output voltage feedback. The LM3489 also includes built-in features such as soft-start, output short circuit protection, over temperature protection, over voltage clamping, and thermal shutdown.

Conclusion

The LM3489EVAL/NOPB is an evaluation board from Texas Instruments which aids engineers in evaluating the performance of the LM3489 synchronous boost controller. The applications of the LM3489 include battery-based systems, ultra-low-power boost applications, and USB On-The-Go (OTG) applications. The LM3489 integrates two N-channel MOSFETs, operates from an input voltage of 0.40V up to 18.0V and produces a regulated output voltage up to 80V with high efficiency. It also includes built-in features such as soft-start, output short circuit protection, over temperature protection, over voltage clamping, and thermal shutdown.

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