LM2794TLX

Overview

The LM2794TLX is a current-regulated switched capacitor LED driver featuring four independent outputs. It operates with an input voltage range of 2.7V to 5.5V and provides an output voltage range of 4.05V to 7.05V. The device supports a maximum output current of 20mA per channel and utilizes a switching frequency of 675kHz. It is housed in a 14-DSBGA package and functions within an operating temperature range of -30°C to 85°C.

Feature Summary

• Integrates a fractional CMOS charge-pump topology for efficient LED power delivery
• Supports mixed analog and PWM brightness control methods for flexible dimming applications
• Includes active-low or high shutdown input functionality for system power management

Applications

• White LED drive circuits
• Portable electronic lighting systems
• Battery-powered display backlighting

Procurement Notes

Verify the specific suffix designation when ordering, as variations such as NOPB indicate lead-free compliance. Confirm that the requested part matches the exact package outline and thermal characteristics required for the target PCB layout. Ensure compatibility with the intended input voltage source and load configuration before finalizing procurement.

Selection Notes

Select this component for designs requiring multiple regulated LED channels from a single low-voltage source. The integrated charge-pump architecture eliminates the need for external inductors, simplifying the bill of materials. Consider the 20mA current limit and 675kHz switching frequency when evaluating efficiency requirements and electromagnetic interference constraints for the application.

Part Context

This device belongs to the LM2794/LM2795 family of current-regulated switched capacitor supplies. It is manufactured by Texas Instruments, formerly associated with Luminary Micro. The component serves as a specialized solution for driving white LEDs in space-constrained portable devices where inductor-based regulators are impractical.

Replacement Considerations

Public confirmed substitute part numbers include LM2794TL/NOPB and LM2794TLX/NOPB. These variants share identical electrical specifications and pinout configurations. Verify that any alternative selection maintains the same 14-DSBGA package dimensions and thermal performance ratings.