LM2792LD-L

Overview

The LM2792LD-L is a dual-output LED driver and DC-DC regulator manufactured by National Semiconductor. It utilizes a switched capacitor (charge pump) topology with internal switches to regulate current for backlight applications. The device operates from a minimum supply voltage of 3V and functions at a frequency of 1.1MHz. Each output channel provides a regulated current of 34mA. It supports both analog and PWM dimming methods. The component is housed in a 10-WSON (3x3) package, also described as a 10-WFDFN Exposed Pad, and is designed for surface mount mounting. It operates within a temperature range of -30°C to 85°C.

Feature Summary

• Dual-output current regulation for independent LED channel control
• Integrated switched capacitor charge pump topology eliminates external inductors
• Supports both analog and pulse-width modulation (PWM) dimming interfaces
• Compact surface-mount packaging suitable for space-constrained designs

Applications

• LCD backlight drivers
• Mobile phone display illumination
• Portable electronic device lighting systems

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor's semiconductor division was acquired by Texas Instruments. Ensure the part number matches the specific suffix requirements for your project. Confirm the package type corresponds to the 10-WSON or 10-WFDFN specification. Check for equivalent NOPB variants if lead-free compliance is required. Validate supplier authenticity through authorized distribution channels.

Selection Notes

Select this component when designing circuits requiring two independently regulated LED outputs from a single low-voltage source. The absence of external inductors makes it suitable for noise-sensitive or space-limited environments. Consider the 34mA output current limit and 3V minimum input voltage during power budgeting. Ensure the chosen dimming method aligns with the system controller capabilities.

Part Context

This component belongs to the family of precision LED drivers designed for portable electronics. It integrates the necessary regulation and switching elements into a small footprint. The design focuses on efficiency and simplicity by using a charge pump architecture rather than inductive boost converters. This approach reduces component count and board area while maintaining stable current regulation for LED loads.

Replacement Considerations

The LM2792LD-L/NOPB is a verified lead-free variant of this component. Verify pin compatibility and electrical specifications before substituting with other dual-output LED drivers. Ensure any replacement maintains the 1.1MHz switching frequency and 34mA output current capability.