Texas Instruments LED Drivers LM3502SQ-44

The LM3502SQ-44 is a step-up converter designed for driving white LEDs in backlighting applications. It can drive up to 10 white LEDs and operates with an input voltage range of 2.5V to 5.5V. The device features a high efficiency of over 80%, which is beneficial for battery-powered devices. It includes internal soft start functionality to minimize inrush current and has built-in protections such as input under-voltage protection and cycle-by-cycle current limiting. The LM3502SQ-44 operates at a constant switching frequency of 1 MHz, allowing for the use of small external components. It is available in a low-profile 16-pin WQFN package, making it suitable for compact designs. The output voltage options for this part number can reach up to 44V, providing flexibility for various LED configurations. This product is particularly suitable for applications in portable devices, such as cellular phones and PDAs, where space and efficiency are critical.