Texas Instruments

TPS61040DBVRG4

TPS61040DBVRG4 Description

The TPS61040DBVRG4 from Texas Instruments is a high-efficiency, DC-DC boost regulator designed for driving LED backlighting applications. This obsolete but historically significant IC integrates an internal power switch, enabling a compact solution with minimal external components. Operating from a 1.8V to 6V input, it delivers a regulated output voltage up to 28V, making it suitable for driving multiple LEDs in series. With a fixed switching frequency of 1MHz, it ensures stable performance while minimizing external component size. The device supports PWM dimming for precise brightness control, a critical feature in display applications. Packaged in a SOT23-5 form factor, it is optimized for space-constrained designs.

TPS61040DBVRG4 Features

• Integrated Power Switch: Eliminates the need for an external MOSFET, reducing BOM cost and PCB footprint.
• Wide Input Voltage Range (1.8V–6V): Supports operation from low-voltage sources like single-cell Li-ion batteries.
• High Output Voltage (Up to 28V): Enables driving multiple LEDs in series for uniform illumination.
• 1MHz Switching Frequency: Reduces inductor size while maintaining efficiency.
• PWM Dimming Support: Allows precise brightness adjustment for display backlighting.
• Compact SOT23-5 Package: Ideal for portable and space-sensitive applications.
• RoHS3 & REACH Compliant: Meets environmental and regulatory standards.

TPS61040DBVRG4 Applications

The TPS61040DBVRG4 excels in LED backlighting for:

• LCD Displays in smartphones, tablets, and portable devices.
• Handheld Instruments requiring efficient, high-voltage LED drivers.
• Battery-Powered Systems where low input voltage and high efficiency are critical.
• Automotive Displays (non-safety-critical) due to its stable output and dimming capability.
  Its PWM dimming feature makes it particularly suitable for applications demanding dynamic brightness control, such as adaptive displays in varying ambient light conditions.

Conclusion of TPS61040DBVRG4

While now obsolete, the TPS61040DBVRG4 remains a benchmark for compact, high-performance LED drivers. Its integrated switch, wide input range, and PWM dimming set it apart from discrete solutions, offering designers a balance of efficiency, size, and control. Though newer alternatives exist, its legacy in backlighting applications underscores its reliability and technical merit. For engineers working with legacy designs or evaluating replacements, understanding its capabilities provides valuable context for modern LED driver selection.