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LM4674A

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Filterless 2.5 Stereo Class D Audio Power Amplifier

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Data sheet

LM4674A

ACTIVE
Data sheet Order now

Product details

Audio input type Analog Input Architecture Class-D Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.4 Load (min) (Ω) 4 Output power (W) 1.2 SNR (dB) 96 THD + N at 1 kHz (%) 0.07 Iq (typ) (mA) 5 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 73 Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.4 Load (min) (Ω) 4 Output power (W) 1.2 SNR (dB) 96 THD + N at 1 kHz (%) 0.07 Iq (typ) (mA) 5 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 73 Operating temperature range (°C) -40 to 85
DSBGA (YZR) 16 5.0625 mm² 2.25 x 2.25
  • Output Short Circuit Protection
  • Stereo Class D Operation
  • No Output Filter Required
  • Logic Selectable Gain
  • Independent Shutdown Control
  • Minimum External Components
  • Click and Pop Suppression
  • Micro-Power Shutdown
  • Available in Space-Saving 2mm x 2mm x 0.6mm DSBGA Package

Key Specifications

  • Efficiency at 3.6V, 100mW into 8Ω 80% (typ)
  • Efficiency at 3.6V, 500mW into 8Ω 85% (typ)
  • Efficiency at 5V, 1W into 8Ω 85% (typ)
  • Quiescent Power Supply Current at 3.6V Supply 4mA
  • Power Output at VDD = 5V, RL = 4Ω, THD ≤ 10% 2.5W (typ)
  • Power Output at VDD = 5V, RL = 8Ω, THD ≤ 10% 1.5W (typ)
  • Shutdown Current 0.1μA (typ)

All trademarks are the property of their respective owners.

  • Output Short Circuit Protection
  • Stereo Class D Operation
  • No Output Filter Required
  • Logic Selectable Gain
  • Independent Shutdown Control
  • Minimum External Components
  • Click and Pop Suppression
  • Micro-Power Shutdown
  • Available in Space-Saving 2mm x 2mm x 0.6mm DSBGA Package

Key Specifications

  • Efficiency at 3.6V, 100mW into 8Ω 80% (typ)
  • Efficiency at 3.6V, 500mW into 8Ω 85% (typ)
  • Efficiency at 5V, 1W into 8Ω 85% (typ)
  • Quiescent Power Supply Current at 3.6V Supply 4mA
  • Power Output at VDD = 5V, RL = 4Ω, THD ≤ 10% 2.5W (typ)
  • Power Output at VDD = 5V, RL = 8Ω, THD ≤ 10% 1.5W (typ)
  • Shutdown Current 0.1μA (typ)

All trademarks are the property of their respective owners.

The LM4674A is a single supply, high efficiency, 2.5W/channel, filterless switching audio amplifier. A low noise PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4674A is designed to meet the demands of mobile phones and other portable communication devices. Operating from a single 5V supply, the device is capable of delivering 2.5W/channel of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V.

The LM4674A features high efficiency compared to conventional Class AB amplifiers. When driving an 8Ω speaker from a 3.6V supply, the device features 85% efficiency at PO = 500mW. Four gain options are pin selectable through the GAIN0 and GAIN1 pins.

Output short circuit protection prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Independent left/right shutdown controls maximizes power savings in mixed mono/stereo applications.

The LM4674A is a single supply, high efficiency, 2.5W/channel, filterless switching audio amplifier. A low noise PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4674A is designed to meet the demands of mobile phones and other portable communication devices. Operating from a single 5V supply, the device is capable of delivering 2.5W/channel of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V.

The LM4674A features high efficiency compared to conventional Class AB amplifiers. When driving an 8Ω speaker from a 3.6V supply, the device features 85% efficiency at PO = 500mW. Four gain options are pin selectable through the GAIN0 and GAIN1 pins.

Output short circuit protection prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Independent left/right shutdown controls maximizes power savings in mixed mono/stereo applications.
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Type Title Date
* Data sheet LM4674A  Filterless 2.5W Stereo Class D Audio Power Amplifier datasheet (Rev. A) 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-1737 Managing EMI in Class D Audio Applications (Rev. A) 01 May 2013

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