Product details

Audio input type Analog Input Architecture Class-D Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.4 Load (min) (Ω) 4 Output power (W) 2.65 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 2.6 Control interface Hardware Closed/open loop Closed Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 78 Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.4 Load (min) (Ω) 4 Output power (W) 2.65 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 2.6 Control interface Hardware Closed/open loop Closed Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 78 Operating temperature range (°C) -40 to 85
DSBGA (YFQ) 9 1.96000000000000028000000000000001 mm² 1.4000000000000001 x 1.4000000000000001 WSON (NGQ) 8 9 mm² 3 x 3
  • Mono Class D Operation
  • No Output Filter Required for Inductive Loads
  • Externally Configurable Gain
  • Very Fast Turn On Time: 17μs (typ)
  • Minimum External Components
  • "Click and Pop" Suppression Circuitry
  • Micro-Power Shutdown Mode
  • Available in Space-Saving 0.4mm Pitch DSBGA and WSON Packages

Key Specifications

  • Efficiency at 3.6V, 400mW into 8Ω Speaker 88% (typ)
  • Efficiency at 3.6V, 100mW into 8Ω Speaker 80% (typ)
  • Efficiency at 5V, 1W into 8Ω Speaker 86% (typ)
  • Quiescent Current, 3.6V Supply 2.1mA (typ)
  • Total Shutdown Power Supply Current
    0.01µA (typ)
  • Single Supply Range 2.4V to 5.5V
  • PSRR, f = 217Hz 78dB

All trademarks are the property of their respective owners.

  • Mono Class D Operation
  • No Output Filter Required for Inductive Loads
  • Externally Configurable Gain
  • Very Fast Turn On Time: 17μs (typ)
  • Minimum External Components
  • "Click and Pop" Suppression Circuitry
  • Micro-Power Shutdown Mode
  • Available in Space-Saving 0.4mm Pitch DSBGA and WSON Packages

Key Specifications

  • Efficiency at 3.6V, 400mW into 8Ω Speaker 88% (typ)
  • Efficiency at 3.6V, 100mW into 8Ω Speaker 80% (typ)
  • Efficiency at 5V, 1W into 8Ω Speaker 86% (typ)
  • Quiescent Current, 3.6V Supply 2.1mA (typ)
  • Total Shutdown Power Supply Current
    0.01µA (typ)
  • Single Supply Range 2.4V to 5.5V
  • PSRR, f = 217Hz 78dB

All trademarks are the property of their respective owners.

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.

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.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 6
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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM4673TMBD — LM4673TMBD Filterless, 2.65W, Mono, Class D Audio Power Amplifier Evaluation Board

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% (...)

Not available on TI.com
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins CAD symbols, footprints & 3D models
DSBGA (YFQ) 9 Ultra Librarian
WSON (NGQ) 8 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos