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LM48512

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2.7-W, mono, analog input Class-D audio amp with integrated boost converter & EMI suppression

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Data sheet

LM48512

ACTIVE
Data sheet Order now

Product details

Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.3 Load (min) (Ω) 4 Output power (W) 2.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 14.5 Control interface GPIO Closed/open loop Closed Analog supply (min) (V) 2.3 Analog supply voltage (max) (V) 5.5 PSRR (dB) 90 Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Boosted Speaker channels (max) Mono Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.3 Load (min) (Ω) 4 Output power (W) 2.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 14.5 Control interface GPIO Closed/open loop Closed Analog supply (min) (V) 2.3 Analog supply voltage (max) (V) 5.5 PSRR (dB) 90 Operating temperature range (°C) -40 to 85
DSBGA (YZR) 16 5.0625 mm² 2.25 x 2.25

  • E 2 S System Reduces EMI while Preserving Audio Quality and Efficiency
  • Integrated Boost Converter
  • Supply Voltage Level Detection on Boost Converter
  • Low Power Shutdown Mode
  • "Click and Pop" suppression
    •

  • E 2 S System Reduces EMI while Preserving Audio Quality and Efficiency
  • Integrated Boost Converter
  • Supply Voltage Level Detection on Boost Converter
  • Low Power Shutdown Mode
  • "Click and Pop" suppression
    •

    Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.

    The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.

    The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.

    Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

    Key Specifications

    ■  Power Output at VDD = 3.6V   RL = 8Ω, THD+N ≤ 1% 1.8W (typ)
    ■   Efficiency at 3.6V, 800mW into 8Ω 82% (typ)
    ■  Quiescent Power Supply Current   at 3.6V 14.5mA
    ■  Shutdown current 0.04μA (typ)

    Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.

    The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.

    The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.

    Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

    Key Specifications

    ■  Power Output at VDD = 3.6V   RL = 8Ω, THD+N ≤ 1% 1.8W (typ)
    ■   Efficiency at 3.6V, 800mW into 8Ω 82% (typ)
    ■  Quiescent Power Supply Current   at 3.6V 14.5mA
    ■  Shutdown current 0.04μA (typ)

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    Type Title Date
    * Data sheet PowerWise Boosted, Ultra Lo-EMI, Mono, E2S Class D Audio Pwr Amp datasheet (Rev. A) 09 Apr 2012
    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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