LM27951SDX/NOPB

Overview

The LM27951SDX/NOPB is a four-channel white LED driver IC from Texas Instruments, designed for adaptive charge pump applications. It operates within an input voltage range of 2.8 V to 5.5 V and delivers up to 30 mA per channel. The device utilizes a switched capacitor topology with a fixed switching frequency of 750 kHz. It supports direct PWM dimming and features an output voltage range of 2.5 V to 3.9 V. Packaged in a 14-LLP (WSON) surface-mount case, it functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates a four-channel constant current source with adaptive charge pump regulation for efficient white LED driving.
• Supports direct pulse-width modulation (PWM) dimming control for precise brightness adjustment.
• Utilizes a compact 14-pin LLP package suitable for space-constrained portable electronic designs.

Applications

• Backlight drivers for mobile phones and handheld devices
• White LED illumination in portable consumer electronics
• Battery-powered lighting systems requiring low input voltage operation

Procurement Notes

Verify the specific suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the ordering part number with the latest datasheet revision to avoid discrepancies in pinout or electrical characteristics during procurement.

Selection Notes

Select this component when designing circuits that require multiple white LEDs driven from a single-cell lithium-ion battery. The integrated charge pump eliminates the need for external inductors, simplifying layout. Consider the 750 kHz switching frequency for EMI management and the 30 mA output limit for appropriate LED string sizing.

Part Context

This part belongs to the LM27951 series of LED lighting drivers. It is specifically engineered for portable applications where size and efficiency are critical. The device integrates high-side switches and control logic into a small footprint, distinguishing it from discrete solutions or larger regulator ICs.

Replacement Considerations

Consult the manufacturer's cross-reference guide for verified substitutes. No public substitute part numbers are confirmed in the provided data.

FAQ

What is the maximum output current per channel?

The LM27951 provides a constant current of up to 30 mA per channel.

Does the device support dimming functionality?

Yes, it supports direct PWM dimming for controlling LED brightness.