LP3944ISQ/NOPB Integrated Circuits (ICs)

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LP3944ISQ/NOPB belongs to the PMIC - LED Drivers family. It offers a wide range of features to control LED lighting and offers an integrated solution to help reduce overall design complexity. The device is designed to provide a constant current or voltage output, based on a wide-range of external control options such as button, potentiometer and digital logic. It is intended primarily for LED lighting applications with high accuracy, lower quiescent current, full protection and good EMC performance.

Description of LP3944ISQ/NOPB

The LP3944ISQ/NOPB is a low-power, low-voltage power management integrated circuit. It is a single-stage voltage regulator that is capable of delivering a wide range of output current and voltage with excellent regulation accuracy. It includes an adjustable current-sense circuit and a dynamic voltage scaling function. The device operates with a wide input voltage range from 0.8V to 6V, with an output voltage range from 0.8V to 4V and a maximum output current of 100mA. It has a quiescent current of 10uA making it highly suitable for battery-powered applications.

The LP3944ISQ/NOPB has a built-in over-voltage, over-current, and brown-out protection. These are essential requirements for stable and reliable performance in open and closed loop applications. In addition, the device includes a slew-rate and turn-on time to control the transition of the device from a shutdown to active mode. It also has an integrated power saving mode allowing the output voltage to be reduced and the LED current to be adjusted when the LED is not illuminated.

Application Field

The LP3944ISQ/NOPB is ideal for those applications that require low-power and cost-effective power management solutions. It is suitable for powering LEDs in backlighting applications such as displays, keypads, button illumination, and illumination of automotive displays. Furthermore, the device is suitable for powering LEDs in general lighting and industrial lighting applications such as dimming, flicker-less dimming, and constant current and constant frequency control. It is also applicable for powering LEDs in mobile and wearable devices, as well as any other application where low-power and cost-effective power management solutions are required.

Working Principle

The LP3944ISQ/NOPB works by controlling the output voltage and current by adjusting the internal reference voltage and ramp voltage. The adjustable current-sense input monitors the LED output current, and the dynamic voltage scaling adjusts the output voltage based on external parameters such as button, potentiometer and digital logic input. It is integrated with a shutdown control to enable the device to enter a low-power mode when not required.

In terms of safety, the LP3944ISQ/NOPB is constructed with over-voltage, over-current, and brown-out protection or thermal protection. In addition, a power saving mode reduces the output voltage and LED current when the LED is not illuminated. All these features provide improved light stability, excellent EMC performance, and lower cost.

Conclusion

The LP3944ISQ/NOPB is an ideal device to power LEDs in battery-powered LED lighting applications. It offers superior control accuracy, full protection, low quiescent current, wide input and output voltage range, and excellent EMC performance. The device operates with an adjustable current-sense circuit and dynamic voltage scaling, providing an integrated solution to reduce design complexity and cost. This device is the perfect choice for general lighting and industrial applications.

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