100mA Ultralow Noise LED Supply with Current Adjust

Description: The LTC3201 contains overtemperature protection and can survive an indefinite output short to GND. Low external parts count (one small flying capacitor and three small bypass capacitors) and small MSOP-10 package size make the LTC3201 ideally suited for space constrained applications. An input noise filter further reduces input noise, thus enabling direct connection to the battery. The LTC3201 is an ultralow noise, constant frequency, charge pump DC/DC converter specifically designed for powering white LEDs. The part produces a low noise boosted supply capable of supplying 100mA of output current. LED current is regulated for accurate and stable backlighting. A 3-bit DAC provides output current adjust for brightness control.

The LTC3201 is an advanced charge pump DC/DC converter that operates with high efficiency and low output noise, making it particularly suitable for applications requiring precise LED backlighting, such as in mobile devices and portable electronics. The device integrates several protective features, including overtemperature protection, which ensures reliability during operation under various thermal conditions. The ability to withstand an indefinite short circuit to ground enhances the robustness of the design, allowing it to maintain functionality even in fault conditions.

The use of a minimal external component count is a significant advantage in space-constrained environments. The circuit requires only one flying capacitor and three bypass capacitors, which simplifies the design and reduces the footprint on the printed circuit board (PCB). The MSOP-10 package further contributes to the compactness of the implementation, making it ideal for portable applications where size is critical.

The input noise filter incorporated into the LTC3201 plays a crucial role in minimizing voltage ripple and ensuring stable operation. This feature allows for a direct connection to battery sources, which is particularly beneficial in battery-powered devices. The charge pump operates at a constant frequency, providing a steady output voltage that is essential for the consistent performance of white LEDs.

The device can supply up to 100mA of output current, which is sufficient for driving multiple LEDs or providing enhanced brightness levels. The output current regulation feature ensures that the LEDs receive a stable current, which is vital for maintaining uniform brightness and extending the lifespan of the LEDs. The addition of a 3-bit digital-to-analog converter (DAC) allows for adjustable output current, enabling dynamic brightness control based on user preferences or ambient light conditions.

Overall, the LTC3201 is a highly effective solution for applications requiring low-noise, efficient LED power supplies, combining compact design with advanced features for enhanced performance and reliability.The LTC3201 contains overtemperature protection and can survive an indefinite output short to GND. Low external parts count (one small flying capacitor and three small bypass capacitors) and small MSOP-10 package size make the LTC3201 ideally suited for space constrained applications. An input noise filter further reduces input noise,thus enabling direct connection to the battery. The LTC®3201 is an ultralow noise, constant frequency, charge pump DC/DC converter specifically designed for powering white LEDs.

The part produces a low noise boosted supply capable of supplying 100mA of output current. LED current is regulated for accurate and stable backlighting. A 3-bit DAC provides output current adjust for brightness control.