LT3791MPFE#PBF

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PMIC - LED Drivers refer to controlled LED sources to provide uniform lighting in a variety of applications. LT3791MPFE#PBF is an adjustable current-regulation boost LED driver which provides a precise regulated output current up to 350 mA. It operates with an input voltage range of 2.3 V to 5.5 V, making it suitable for a variety of battery-powered applications such as cell phones, digital cameras, handheld devices, and light systems. The primary applications served by this product include general lighting, automotive lighting, strips, and decorative lighting.

Features

The LT3791MPFE#PBF features advantages including a 0.75 V drop-out voltage and small size. The standby current is less than 10 μA, making it ideal for battery-powered applications. It comes in a small 2.4 mm x 4.2 mm x 0.65 mm DFN package with a lead-free and RoHS-compliant bill of materials (BOM) to reduce costs. Furthermore, the device is designed to handle harsh environments and is specified from -40°C to +125°C junction temperature.

Working Principle

The LT3791MPFE#PBF uses a single inductor and control system to regulate current in the output light-emitting diode (LED). The device contains an error amplifier, a current sense amplifier, a peak current limit comparator, and a bridge driver. The error amplifier monitors and compares the current against the current reference set by the external resistor. The current sense amplifier and peak current limit comparator received the current feedback information from the inductor.

When the LED current level reaches the programmed peak current limit, the peak current limit comparator trips, and it disconnects the LED current sense resistor from the LED, causing the LED current to decrease. To support higher voltages and improving the brightness of the LED, the device can be configured for two times or three times the input voltage, making it a great choice for applications requiring high power output and high efficiency.

Comparison to Alternate Solutions

The LT3791MPFE#PBF offers excellent performance at a low cost when compared to discrete solutions. An all-discrete LED design requires several components, including a separate shunt regulator, PNP/NPN transistors push-pull current source, output series resistor and more. This increases not only the component cost but also the design time and PCB cost due to the increased number of components.

The LT3791MPFE#PBF overcomes these challenges by using a single package to regulate and drive the LEDs, which eliminates additional components and reduces the overall cost. The product also offers superior protection features, such as current sense protection, over-current protection and over-temperature protection. These protection features provide better system reliability and longer product life expectancy.

Conclusion

LT3791MPFE#PBF is an adjustable current-regulation boost LED driver which provides a precise regulated output current up to 350 mA for a variety of battery-powered applications, thanks to its input voltage range of 2.3 V to 5.5 V. High power output and high efficiency can be achieved by the product being configured for two times or three times the input voltage. The LT3791MPFE#PBF offers excellent performance at a low cost when compared to discrete alternatives, and its components are lead-free and RoHS-compliant.

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