LM3434SQ/NOPB Integrated Circuits (ICs)

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The LM3434SQ/NOPB is a power management integrated circuit (PMIC) developed by Texas Instruments (TI). It is part of TI\'s LED drivers product family and its main function is driving LEDs.

The LM3434SQ/NOPB integrates two constant current drivers into a single integrated circuit. It is designed to drive up to four white LEDs, in a step-up, step-down or fixed-frequency operating mode. It also features a boost control pin, which provides a boost control signal to each of the two constant current drivers.

The LM3434SQ/NOPB can be used in a variety of applications such as LCD backlighting, keyboards, automotive dash lighting, and general lighting. It has a wide range of output power from 0.3 W to 3 W and can drive up to 36 V when in boost mode. Operating efficiency is up to 97%, making it suitable for low power applications.

Working Principle

The LM3434SQ/NOPB works by controlling the current in an LED that is connected to its output pins. When the voltage is applied to the input of the device the boost pin of the device helps the LM3434SQ/NOPB to convert the input voltage into a higher output voltage. The current is regulated by controlling the switching of the high voltage MOSFETs. When the current through the LEDs reach a certain level the LM3434SQ/NOPB automatically shuts off the MOSFETs and prevents them from operating beyond their ability.

The LM3434SQ/NOPB also features a slew rate control pin, which can be used to reduce the LED brightness in the low light conditions and increase the LED brightness in high light conditions. This helps to conserve power and reduce system power consumption when in darker environments.

The LM3434SQ/NOPB also offers a number of other features such as over-temperature and over-voltage protection, overtemperature limit pre-warning, EMI protection, and thermal shut-down. This makes it suitable for applications such as automotive, medical, industrial, and consumer electronics.

Conclusion

The LM3434SQ/NOPB is an ideal solution for driving up to four white LEDs. Its wide range of output power, high operating efficiency, slew rate control pin, and other protection features make it suitable for a wide variety of applications. This power management integrated circuit offers an all-in-one solution for LED driving and is especially suited for low power applications.

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