LM27951SD

Overview

The LM27951SD is a switched-capacitor white LED driver designed for adaptive 1.5x/1x operation, capable of driving up to four LEDs with 30 mA per channel. It operates within an input voltage range of 2.8 V to 5.5 V and delivers output voltages between 2.5 V and 3.9 V. The device features PWM dimming control and integrates internal switches within a 14-WSON package. It supports a switching frequency of 750 kHz and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Adaptive 1.5x/1x switched-capacitor topology for efficient white LED driving
• Four-channel constant current output capability
• Integrated PWM dimming control interface

Applications

• White LED backlighting systems
• Portable electronic display illumination
• LED lighting modules requiring compact drivers

Procurement Notes

Verify the specific ordering suffix (e.g., NOPB) against official Texas Instruments documentation to confirm RoHS compliance status. Ensure the selected package variant matches the required PCB footprint and thermal performance specifications for the target application environment.

Selection Notes

Select this component for applications requiring multi-channel white LED regulation with minimal external inductance. Evaluate the 30 mA per channel limit against total luminous flux requirements. Confirm that the 2.8 V minimum input voltage aligns with the system power supply architecture.

Part Context

The LM27951 belongs to the Texas Instruments family of switched-capacitor LED drivers. It is specifically engineered for portable devices where space constraints prohibit the use of inductive boost converters. The device provides a compact solution for driving multiple series-connected white LEDs from low-voltage sources.

Replacement Considerations

Consult official cross-reference data for direct substitutes. Verify pin compatibility and electrical parameter alignment before substitution.