LT3954EUHE#PBF

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The LT3954EUHE#PBF is a high performance step-up DC/DC power IC from Linear Technology. It has been designed for powering multiple LEDs from a single DC energy source with up to 95% efficiency. The IC has precise current regulation at each of the LEDs and is used in many applications such as automotive, consumer, industrial, and medical.

This IC provides excellent power conversion efficiency and offers a wide junction temperature operating range of up to 105°C. It is designed with a patented valley-fill algorithm that enables it to operate at higher switching frequencies and provide higher efficiency than other available solutions. Additionally, it offers a wide input voltage range of 2.6V to 22V and output current ranges from 10mA to 10A.

Typical Applications

The LT3954EUHE#PBF is used in many applications and is especially useful in automotive lighting applications such as LED headlights and taillights. It is also well suited for LED bulbs, LED backlighting for LCD displays, LED illuminating signs, LED floodlights, LED strobe lights, LED moving signs, and other LED lighting solutions.

Working Principle

The IC works on the principle of step-up DC/DC power conversion, which is the process of taking a direct or regulated DC input source and converting it into a higher DC output required for the application. In the LT3954EUHE#PBF, the input voltage is boosted to the desired output voltage using a boost converter circuit.

The booster converter consists of two power switches: an inductor, a diode, two capacitors, and an output voltage sense resistor. This circuit works as follows: When the switch is turned on, current flows through the inductor which stores the energy. When the switch is turned off, the current stored in the inductor is discharged and flows through the diode to supply power to the output. The capacitor connected to the output filters the output ripple. By controlling the conduction time of the switch, the output voltage is regulated. The output voltage is also monitored by the output voltage sense resistor, which provides feedback to the controller IC to ensure the output voltage is accurate.

Features and Benefits

The LT3954EUHE#PBF offers several features and benefits that make it ideal for powering multiple LEDs from a single source with up to 95% efficiency.

• Wide input and output voltage range of 2.6V to 22V and 10mA to 10A respectively.
• Wide junction temperature operating range of 0°C to 105°C.
• Patented valley-fill algorithm that enables higher switching frequencies and higher efficiency.
• High efficiency and high power conversion.
• Provides excellent performance and reliability.
• Integrated true current source for each output channel.

Conclusion

The LT3954EUHE#PBF IC from Linear Technology is a high performance step-up DC/DC power IC that is designed for powering multiple LEDs from a single DC energy source with up to 95% efficiency. With its wide input and output voltage ranges, robust construction and patented valley-fill algorithm, it is suitable for applications such as automotive lighting, LED bulbs, and LED backlighting.

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