LM3502SQX-25/NOPB

Overview

The LM3502SQX-25/NOPB is a synchronous step-up DC/DC converter designed for white LED applications. It operates with an input voltage range of 2.5V to 5.5V and provides a fixed output voltage of 25V. The device integrates an internal power switch capable of delivering up to 400mA of output current. It functions at a switching frequency of 1MHz, enabling the use of small external inductors and capacitors. The component supports PWM dimming control for brightness adjustment and includes protection features such as over-current protection and thermal shutdown.

Feature Summary

• Integrates a synchronous boost topology for high efficiency in LED driving applications
• Supports PWM dimming control for precise brightness management
• Includes built-in over-current protection and thermal shutdown mechanisms

Applications

• White LED backlight drivers
• Portable electronic device illumination systems
• General-purpose step-up DC/DC conversion for low-power LED loads

Procurement Notes

Verify the exact suffix '25' confirms the fixed 25V output variant, as other suffixes indicate different voltage levels. Ensure the package type matches the design requirements, as this model uses a specific surface-mount footprint. Confirm RoHS compliance status through official Texas Instruments documentation prior to procurement to meet environmental standards.

Selection Notes

Select this component when a fixed 25V output is required from a single-cell lithium battery or similar low-voltage source. The 1MHz switching frequency allows for compact passive components compared to lower-frequency alternatives. Consider the 400mA current limit when sizing the load; higher current demands may require parallel configurations or different device families.

Part Context

This part belongs to the LM3502 family of synchronous step-up converters from Texas Instruments. Variants within this series, such as the LM3502SQX-16/NOPB or LM3502SQX-44/NOPB, offer different fixed output voltages (16V and 44V respectively) while sharing the same core architecture and pinout compatibility for easy substitution in designs requiring different LED forward voltage sums.

Replacement Considerations

Direct substitutes include LM3502SQX-16/NOPB for 16V output and LM3502SQX-44/NOPB for 44V output, provided the circuit layout supports the voltage change. Other TI devices like the LM3402 series may serve as functional replacements but often require schematic modifications due to differences in control architecture.