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Texas Instruments LM4675SD/NOPB — Analog & Data Acquisition

LM4675SD/NOPB Class D Audio Amplifier, 2.7W Mono, 8-WSON

MPNLM4675SD/NOPB
End of Life

Texas Instruments Boomer®, PowerWise® series, LM4675SD/NOPB, Class D Audio Amplifier, 1-Channel (Mono), 2.7W x 1 @ 4Ohm, 2.4V ~ 5.5V supply, Surface Mount, 8-WFDFN Exposed Pad, -40°C ~ 85°C.

$2.18Ref. price · indicative, final on quote
Texas Instruments LM4675SD/NOPB datasheet (PDF)
Packaging8-WFDFN Exposed Pad
RoHSROHS3 Compliant
SeriesBoomer®, PowerWise®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM4675SD/NOPB specifications
ParameterValue
TypeClass D
SeriesBoomer®, PowerWise®
Output type1-Channel (Mono)
MountingSurface Mount
Supply voltage2.4V ~ 5.5V
Max output power x channels @ load2.7W x 1 @ 4Ohm
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesDepop, Differential Inputs, PWM, Short-Circuit and Thermal Protection, Shutdown
Case8-WFDFN Exposed Pad

Product details

Class D mono amplifier for portable audio

The Texas Instruments LM4675SD/NOPB is a Class D mono audio amplifier from the Boomer® and PowerWise® series, delivering 2.7W into a 4Ω load from a single 2.4V to 5.5V supply. Typical applications include portable speakers, mobile phones, GPS units, and other battery-powered audio devices where efficiency and board space are tight.

The 2.7W output into 4Ω is the maximum continuous power before clipping at the rated supply and THD. For a 3.7V Li-ion battery, expect around 1.5W into 4Ω at lower distortion — still enough for a small enclosure. The 2.4V to 5.5V supply range covers single-cell Li-ion down to near-depletion and 5V USB rails, so the amplifier keeps running as the battery sags.

The NOPB suffix confirms lead-free soldering compatibility with standard reflow profiles.

Frequently asked questions

Does LM4675SD/NOPB require an external output filter?

For long speaker wires or EMI-sensitive applications, a small ferrite bead and capacitor may still be added, but the part is designed for filterless operation in most cases.