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The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.
The LM4673 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.
The LM4673 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 88% at 400mW output power.
The LM4673 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).
The gain of the LM4673 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier datasheet (Rev. D) | 01 May 2013 | |
| Application note | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 26 Aug 2019 | ||
| Application note | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 27 Jun 2019 | ||
| Application note | AN-1497 Filterless Class D Amplifiers (Rev. A) | 01 May 2013 | ||
| Application note | AN-1614 LM48510 Speaker AN- (Rev. B) | 01 May 2013 | ||
| Application note | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 01 May 2013 |
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The LM4673 is a filterless 2.65W class D fully differential audio amplifier in an 8 pin LLP package. The LM4673 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.24 Watts of average power to an 8 ohm load with less than 1% (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFQ) | 9 | Ultra Librarian |
| WSON (NGQ) | 8 | Ultra Librarian |
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