LM2794BL

Overview

The LM2794BL is a current-regulated switched capacitor LED driver IC manufactured by Texas Instruments. It utilizes a fractional CMOS charge-pump topology to provide regulated output for backlighting applications, supporting up to four LEDs. The device operates within an input voltage range of 3V to 5.5V and delivers a constant output current of 10mA per channel. It features analog brightness control capabilities and includes a shutdown function with active-low or high logic options. The component is housed in a 14-pin DSBGA package.

Feature Summary

• Fractional CMOS charge-pump topology for efficient power conversion
• Current-regulated outputs designed for driving multiple white LEDs
• Integrated analog brightness control functionality
• Shutdown input support for power management

Applications

• Mobile phone LCD backlighting
• Portable electronic device illumination
• Embedded system display backlights

Procurement Notes

Verify the specific suffix and package configuration against the official datasheet to ensure compatibility with design requirements. Confirm that the component status aligns with project timelines, as availability may vary. Cross-reference pin assignments and electrical characteristics with the manufacturer's documentation before integration.

Selection Notes

Select this component for applications requiring a compact solution for driving multiple LEDs from low-voltage sources. Consider the fixed output current and voltage headroom requirements when designing the LED string. Evaluate the thermal performance and PCB layout constraints associated with the DSBGA package for optimal reliability.

Part Context

The LM2794BL belongs to the LM2794 family of LED drivers from Texas Instruments. This series focuses on providing efficient, space-saving solutions for portable electronics. The BL variant specifically denotes the 14-lead DSBGA package configuration, distinguishing it from other pinout options within the same functional family.

Replacement Considerations

• LM2794TL/NOPB

FAQ

What is the maximum number of LEDs supported by the LM2794BL?

The LM2794BL supports driving up to four LEDs simultaneously.

Does the LM2794BL support dimming control?

Yes, the device features integrated analog brightness control capabilities.