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LM4665

ACTIVE

1.4-W, mono, analog input Class-D audio amp with selectable gain

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Data sheet

LM4665

ACTIVE
Data sheet Order now

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) 2.7 Load (min) (Ω) 4 Output power (W) 1.4 THD + N at 1 kHz (%) 0.8 Iq (typ) (mA) 14 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 PSRR (dB) 52 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) 2.7 Load (min) (Ω) 4 Output power (W) 1.4 THD + N at 1 kHz (%) 0.8 Iq (typ) (mA) 14 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 PSRR (dB) 52 Operating temperature range (°C) -40 to 85
DSBGA (YZR) 9 3.0625 mm² 1.75 x 1.75
  • No Output Filter Required for Inductive Transducers
  • Selectable Gain of 6dB (2V/V) or 12dB (4V/V)
  • Very Fast Turn On Time: 5ms (typ)
  • User Selectable Shutdown High or Low Logic Level
  • Minimum External Components
  • "Click and Pop" Suppression Circuitry
  • Micro-Power Shutdown Mode
  • Short Circuit Protection
  • DSBGA, WSON, and VSSOP Packages (No Heat Sink Required)

Key Specifications

  • Efficiency at 100mW into 8Ω Transducer 75%(typ)
  • Efficiency at 400mW into 8Ω Transducer 80%(typ)
  • Total Quiescent Power Supply Current (3V) 3mA(typ)
  • Total Shutdown Power Supply Current (3V) 0.01µA(typ)
  • Single Supply Range (VSSOP & WSON) 2.7V to 5.5V
  • Single Supply Range (DSBGA) (Note 11) 2.7V to 3.8V

All trademarks are the property of their respective owners.

  • No Output Filter Required for Inductive Transducers
  • Selectable Gain of 6dB (2V/V) or 12dB (4V/V)
  • Very Fast Turn On Time: 5ms (typ)
  • User Selectable Shutdown High or Low Logic Level
  • Minimum External Components
  • "Click and Pop" Suppression Circuitry
  • Micro-Power Shutdown Mode
  • Short Circuit Protection
  • DSBGA, WSON, and VSSOP Packages (No Heat Sink Required)

Key Specifications

  • Efficiency at 100mW into 8Ω Transducer 75%(typ)
  • Efficiency at 400mW into 8Ω Transducer 80%(typ)
  • Total Quiescent Power Supply Current (3V) 3mA(typ)
  • Total Shutdown Power Supply Current (3V) 0.01µA(typ)
  • Single Supply Range (VSSOP & WSON) 2.7V to 5.5V
  • Single Supply Range (DSBGA) (Note 11) 2.7V to 3.8V

All trademarks are the property of their respective owners.

The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.

The LM4665 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 400mW with less than 2%THD+N.

The LM4665 has high efficiency with an 8Ω transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW output power.

The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either a logic high or low depending on the mode selection. Connecting the Shutdown Mode pin to either VDD (high) or GND (low) enables the Shutdown pin to be driven in a likewise manner to activate shutdown.

The LM4665 has fixed selectable gain of either 6dB or 12dB. The LM4665 has short circuit protection against a short from the outputs to VDD, GND or across the outputs.

The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.

The LM4665 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 400mW with less than 2%THD+N.

The LM4665 has high efficiency with an 8Ω transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW output power.

The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either a logic high or low depending on the mode selection. Connecting the Shutdown Mode pin to either VDD (high) or GND (low) enables the Shutdown pin to be driven in a likewise manner to activate shutdown.

The LM4665 has fixed selectable gain of either 6dB or 12dB. The LM4665 has short circuit protection against a short from the outputs to VDD, GND or across the outputs.
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Type Title Date
* Data sheet LM4665  Filterless High Efficiency 1W Switching Audio Amplifier datasheet (Rev. E) 02 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
White paper Digital Microphones - Applications and System Partitioning 01 Apr 2003

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