LM3500TL-21/NOPB

Overview

The LM3500TL-21/NOPB is a synchronous step-up DC/DC converter designed for white LED applications. It operates at a fixed switching frequency of 1MHz, enabling the use of compact external inductors and capacitors. The device supports an input voltage range starting from 2.7V and delivers a regulated output current up to 640mA. It functions within a temperature range of -40°C to 85°C and utilizes an 8-DSBGA surface-mount package.

Feature Summary

• Synchronous step-up topology optimized for white LED backlighting
• Fixed 1MHz switching frequency for reduced passive component size
• Integrated internal switch for efficient power conversion

Applications

• White LED backlight drivers
• Portable electronic display illumination
• Mobile phone lighting systems

Procurement Notes

Verify the specific suffix 'TL-21' against the official Texas Instruments datasheet to confirm pinout and electrical characteristics match the design requirements. Ensure the NOPB designation indicates lead-free compliance as per RoHS standards. Cross-reference the 8-DSBGA package dimensions with the mechanical drawing to validate board layout compatibility before finalizing procurement orders.

Selection Notes

Select this component when a compact solution for white LED driving is required with a fixed 1MHz frequency. It is suitable for applications needing up to 640mA output current from low input voltages. Consider the thermal performance within the -40°C to 85°C range and the space constraints offered by the small DSBGA package for portable devices.

Part Context

This part belongs to the LM3500 family of synchronous step-up converters developed by Texas Instruments. The family includes variants like the LM3500 and LM3501, which share similar core functionalities for white LED applications but may differ in package options or specific electrical ratings. The LM3500 series is widely used in consumer electronics for display backlighting.

Replacement Considerations

Publicly confirmed substitute part numbers include the LM3500 and LM3501 from Texas Instruments. Other potential equivalents found in public listings are the APW7071, SP1937, KAB3405T, and SP1938, though functional verification is required.