LM3500TLX-21/NOPB

Overview

The LM3500TLX-21/NOPB is a synchronous step-up DC-DC converter designed for white LED applications. It operates with an input voltage range of 2.7 V to 7 V and delivers a switch current of 640 mA. The device features a fixed output voltage of 21 V and operates at a switching frequency between 850 kHz and 1.15 MHz. It is housed in an 8-DSBGA package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Synchronous boost topology for efficient power conversion
• Integrated internal power switch
• Fixed 21 V output voltage configuration

Applications

• White LED lighting drivers
• Portable electronic device illumination
• Battery-powered LED modules

Procurement Notes

Verify component status as the LM3500TLX-21/NOPB is listed as obsolete by Texas Instruments. Confirm availability through authorized distributors or surplus suppliers, noting that new production may be limited. Ensure compatibility with existing PCB footprints and thermal requirements before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring a fixed 21 V output from low-voltage inputs up to 7 V. The 640 mA switch current capability suits medium-power LED strings. Consider the 8-DSBGA package size for space-constrained designs. Evaluate the 850 kHz to 1.15 MHz frequency range for EMI and filter component sizing.

Part Context

This part belongs to the LM3500 series of LED drivers from Texas Instruments. It is specifically engineered for high-efficiency white LED driving in portable devices. The device integrates a synchronous rectifier to minimize power loss compared to asynchronous solutions.

Replacement Considerations

• LM3500TLX-16/NOPB
• LM3500TLX-21