LT3952EFE#PBF

PMIC - LED Drivers: LT3952EFE#PBF

LT3952EFE#PBF is a member of the LT3950 family of low noise, high efficiency, step-up (boost) switching regulators. It has an adjustable switching frequency up to 500 kHz, allowing for low parts-count implementations and high frequency switching for small inductors. It also exhibits current mode control, which provides better line and load regulation than standard voltage mode control.

Its boost regulator is well suited for single-cell Li-Ion/Li-Pol batteries, with an efficiency rating of up to 93%. In addition, its input voltage range is from 1.8V to 4.2V, making it ideal for solar cell and battery applications. It has an adjustable output voltage range of 3.3V to 28V, providing the flexibility for the designer to configure for the appropriate application.

Application Field

It is a versatile power device which has multiple applications in the field of LED lighting, Wearable devices, PMS, HID bulbs, signage, automotive, medical and consumer electronics. Its application field is for applications which require a high efficiency LED driver with low switching noise and wide input voltage range. LED lighting especially benefits from higher efficiency designs with more dynamic conditions, since LED lighting sources such as headlight, taillight and interior lighting all require a wide input voltage range and high frequency. This device with its adjustable switching frequency provides an easy way to implement low parts-count designs.

Working Principle

The LT3952EFE#PBF is a current-mode step-up switching regulator, which is designed to provide a regulated output voltage, when driven by a regulated or unregulated input voltage. It\'s a device based on an array of 12F integrated circuit, which is divided into two halves - the boost side and the step-up half. The boost side consists of a series of switches, which are connected to an inductor and a diode, and it is responsible for storing energy in the inductor when it is powered up. The step-up side consists of a comparator and a transformer, which are connected to an external resistor and capacitor to regulate the output voltage. When the input voltage reaches a predetermined level, the comparator triggers the transistor of the step-up section and the transformer. This switches the stored energy from the inductor to the regulated output voltage.

Conclusion

The LT3952EFE#PBF is an ideal device for LED lighting applications, due to its high efficiency and low noise operation. It is capable of providing a wide input voltage range and adjustable switching frequency for better efficiency. Its current-mode control ensures better line and load regulation, making it a reliable choice for LED lighting applications.