LM27951SD/NOPB

Overview

The LM27951SD/NOPB is a white LED adaptive driver IC from Texas Instruments, utilizing a switched capacitor (charge pump) topology. It features four constant current outputs capable of delivering 30 mA per channel. The device operates within an input voltage range of 2.8 V to 5.5 V and supports PWM dimming for brightness control. Designed for compact applications, it is housed in a 14-WSON package with dimensions of 4x3 mm. The integrated charge pump allows for efficient voltage boosting to drive series-connected LEDs from a single-cell lithium-ion battery source.

Feature Summary

• Integrates a high-efficiency switched capacitor charge pump to boost voltage for driving multiple white LEDs in series.
• Provides four independent constant current channels with precise output regulation for uniform LED brightness.
• Supports pulse-width modulation (PWM) dimming for flexible backlight intensity control without color shift.

Applications

• Mobile phone LCD backlighting
• Smartphone camera flash illumination
• Portable media player displays

Procurement Notes

Verify the specific suffix 'NOPB' confirms RoHS compliance and absence of lead. Confirm the package marking matches the 14-WSON (4x3) footprint. Ensure the design accounts for the external capacitors required for the charge pump operation as specified in the datasheet schematics. Check for any obsolescence notices or lifecycle status updates directly from Texas Instruments before finalizing procurement.

Selection Notes

Select this component when designing portable devices requiring a compact solution for driving four series-connected white LEDs from a single-cell power source. It is suitable for applications needing precise current matching across multiple channels and PWM dimming capabilities. Consider the thermal performance within the small WSON package and ensure adequate PCB copper area for heat dissipation during continuous operation at maximum current loads.

Part Context

This part belongs to the LM27951 family of LED drivers designed specifically for mobile communication devices. It complements other Texas Instruments PMIC solutions by providing dedicated lighting control. The device integrates protection features such as open-load detection and thermal shutdown to ensure reliability in consumer electronics environments where space and power efficiency are critical constraints.

Replacement Considerations

LM27952SD/NOPB is a direct replacement option available from Texas Instruments. Verify pin-to-pin compatibility and identical electrical specifications before substitution. Ensure the alternative part meets the same RoHS requirements and package dimensions for seamless integration into existing designs.