LT3795IFE#PBF

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PMIC - LED Drivers: LT3795IFE#PBF Application Field and Working Principle

LT3795IFE#PBF is one of the products of Linear Technology, a leader in the development of high performance Analog and mixed-signal integrated circuits. It is a powerful and efficient LED driver that can provide non- dimmable constant-current LED operation with low power consumption. In addition, it can operate at a switching frequency up to 2 MHz.

The LT3795IFE#PBF LED driver consists of an LED driver control IC, an efficiency-enhancing high-side FET, and a low-side synchronous buck regulator with a 320 mA integrated ideal diode. it comes in a compact, thermally-efficient, 3 mm × 3 mm DFN package, and is optimized for the driving of up to 4 LEDs. This device has been designed to drive LEDs in automotive, industrial, commercial, and consumer lighting applications.

Applications

The LT3795IFE#PBF LED driver is used in applications such as residential/ commercial/ industrial lighting, power/ ambient/ architectural lighting, interior/ exterior automotive lighting, and medical lighting. Furthermore, it is suitable for applications that require low power consumption, such as handheld or battery-powered portable lighting. Other applications include step-up or step-down converters for LEDs, LED matrix and backlighting.

Operating Principle

The LT3795IFE#PBF LED driver is based on an integrated 4-channel (RGB) LED Constant Current Controller and a step-down high-efficiency synchronous buck converter. The LED current is regulated by a MOSFET functioning as a source resistor that modulates the LED current. The integrated buck converter reduces the voltage ripple of the LED current, resulting in reduced LED power consumption. The device also features input voltage protection, over-temperature protection and an under-voltage lockout (UVLO) protection. The UVLO ensures that the power source is properly regulated and that the LED driver is not operating at a higher voltage than the LEDs can handle.

This LED driver features a PWM-controlled boost and a PWM-controlled dimming feature for low-power LED operation. The addition of a built-in PWM dimmer enables LED brightness to be tuned to the desired level.

Conclusion

The LT3795IFE#PBF LED driver from Linear Technology is a powerful and efficient LED driver that combines the benefits of excellent efficiency and low power consumption in a compact, thermally-efficient package. It is designed for driving up to 4 LEDs in a variety of automotive, industrial, commercial and consumer lighting applications. The device integrates a 4-channel constant current controller, an efficiency-enhancing high-side FET, and a low-side synchronous buck regulator with a 320 mA integrated ideal diode. In addition, the device features PWM-controlled boost and dimming functions as well as input voltage protection, over-temperature protection, and an under-voltage lockout (UVLO) protection.

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