LM2794TL

Overview

The LM2794TL is a current-regulated switched capacitor LED driver IC from Texas Instruments, designed for efficient white LED drive applications. It features a charge pump topology with four independent constant current outputs, each capable of delivering up to 80 mA. The device operates within an input voltage range of 2.7 V to 5.5 V and supports analog and PWM mixed dimming control. It functions at a switching frequency between 325 kHz and 675 kHz, housed in a compact 14-DSBGA package suitable for surface mount assembly.

Feature Summary

• Integrates a charge pump topology for efficient current regulation without requiring inductors
• Supports mixed dimming control through combined analog and PWM signal inputs
• Provides four independent constant current channels for multi-string LED driving

Applications

• White LED backlighting systems
• Portable electronic device illumination
• General LED lighting driver circuits

Procurement Notes

Verify the specific suffix (e.g., NOPB) against the manufacturer's official datasheet to confirm lead-free compliance and pinout compatibility. Ensure the ordering quantity matches the required packaging format, such as cut tape or reel, as specified by the distributor. Cross-reference the component marking with the official identification codes to prevent counterfeit substitution.

Selection Notes

Select this component when designing space-constrained LED drivers that require inductor-less solutions. The four-channel architecture is optimal for driving multiple LED strings independently. Consider the 2.7 V to 5.5 V input range compatibility with single-cell lithium-ion power sources. Evaluate the thermal performance requirements relative to the DSBGA package size for the intended application environment.

Part Context

This part belongs to the LM2794 series of LED lighting driver ICs. It is manufactured by Texas Instruments under the National Semiconductor lineage. The device is categorized under LED Lighting Drivers and Driver ICs. It utilizes a capacitive switched capacitor topology, distinguishing it from inductive DC-DC converters commonly used in similar power applications.

FAQ

What type of dimming control does the LM2794TL support?

The LM2794TL supports mixed dimming control, allowing for both analog and PWM dimming signals to adjust LED brightness.

How many output channels are available on this IC?

The LM2794TL provides four independent output channels for regulating current to connected LEDs.