1A Low Noise High Current LED Torch/Flash

An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. The LTC3216 is available in a small 3mm x 4mm 12-Lead DFN package. The LTC®3216 is a low noise, high current charge pump DC/DC converter designed to power high current LEDs. The part includes an accurate programmable current source capable of driving loads up to 1A from a 2.9V to 4.4V input. Low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3216 ideally suited for small, battery-powered applications.

The LTC3216 operates as a highly efficient charge pump, utilizing a dual-mode architecture to optimize performance across varying load conditions. In automatic mode, the device continuously monitors the voltage drop across the LED to determine if a transition to a different operational mode is necessary. This feature is particularly beneficial in applications where the input voltage may fluctuate, ensuring that the LED receives a consistent current while minimizing power loss.

The programmable current source within the LTC3216 allows for precise control over the LED current, adjustable via external resistors. By selecting appropriate resistor values, the current can be set to any desired level up to 1A, providing flexibility for various LED configurations. The device's input voltage range of 2.9V to 4.4V makes it compatible with a wide array of power sources, including lithium-ion batteries commonly found in portable electronics.

The compact 3mm x 4mm 12-Lead DFN package contributes to the overall space efficiency of the circuit design, making the LTC3216 an ideal choice for applications where board space is at a premium. The reduced external component count not only simplifies the layout but also enhances reliability, as fewer components lead to fewer potential points of failure. The inclusion of only two flying capacitors, two programming resistors, and two bypass capacitors streamlines the design process while maintaining high performance.

In summary, the LTC3216 is a sophisticated solution for driving high current LEDs in compact and battery-operated devices, combining low dropout characteristics, automatic mode switching for efficiency, and a straightforward design that minimizes component requirements.An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. The LTC3216 is available in a small 3mm x 4mm 12-Lead DFN package. The LTC®3216 is a low noise, high current charge pump DC/DC converter designed to power high current LEDs.

The part includes an accurate programmable current source capable of driving loads up to 1A from a 2.9V to 4.4V input. Low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3216 ideally suited for small, battery-powered applications.

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