LM2755TM/NOPB

Overview

The LM2755TM/NOPB is a charge-pump-based constant current LED driver from Texas Instruments, housed in an 18-bump DSBGA package. It operates on a DC input voltage range of 2.7V to 5.5V with a switching frequency of 1.25MHz. The device features three independent channels, each capable of delivering up to 30mA, for a total output current of 90mA. It supports PWM dimming and includes built-in soft-start and over-temperature protection (OTP). The operating temperature range spans from -30°C to +85°C.

Feature Summary

• Integrates an I2C-compatible interface for programmable trapezoidal diode current waveforms, allowing precise control over timing parameters such as rise time, fall time, delay, and high/low levels.
• Employs an inductorless charge pump topology that automatically selects between gain 3/2 and gain 1 based on LED forward voltage requirements to maximize efficiency across the input voltage range.
• Provides 32 exponentially spaced brightness levels designed to align with human eye response characteristics, ensuring perceptually uniform dimming adjustments.

Applications

• Indicator LEDs
• Keyboard LED backlights
• Display LED backlights
• Fun lighting LEDs

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and functional equivalence. Ensure the component meets the required thermal management specifications for the intended application environment. Confirm RoHS compliance status through the manufacturer's latest datasheet or certification documents before finalizing procurement decisions.

Selection Notes

Select this component when designing circuits requiring compact, inductorless LED driving solutions with digital control capabilities. It is suitable for applications where space constraints preclude the use of magnetic components and where precise, software-defined light intensity profiles are necessary. Consider the maximum output current limits and thermal dissipation requirements of the DSBGA package during the initial design phase.

Part Context

This part belongs to the LM2755 series of LED drivers manufactured by Texas Instruments. It is specifically engineered for portable electronics and consumer devices where low profile and efficient power conversion are critical. The series utilizes advanced charge pump technology to drive multiple LEDs from a single-cell battery source without external inductors.

Replacement Considerations

Public confirmed substitute part numbers: None identified in provided data.