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通用型音訊放大器

LM49251

現行

具 20-mW 耳機放大器的 1.37-W、立體聲道類比輸入 AB 類音訊放大器

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產品規格表

LM49251

現行
產品規格表 立即訂購

產品詳細資料

Audio input type Analog Input Architecture Class-D Speaker channels (max) Stereo Control interface I2C Output power (W) 1.37 Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 THD + N at 1 kHz (%) 0.02 Load (min) (Ω) 4 Analog supply voltage (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 85
Audio input type Analog Input Architecture Class-D Speaker channels (max) Stereo Control interface I2C Output power (W) 1.37 Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 THD + N at 1 kHz (%) 0.02 Load (min) (Ω) 4 Analog supply voltage (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 85
DSBGA (YZR) 30 8.9375 mm² (— mm × — mm)
  • Class G Ground Referenced Headphone Outputs
  • E2S Class D Amplifier
  • No Clip Function
  • Power Limiter Speaker Protection
  • I2C Volume and Mode Control
  • Advanced Click-and-Pop Suppression
  • Micro-Power Shutdown

Key Specifications

  • Class G Headphone Amplifier, HPVDD = 1.8V, RL = 32Ω
    • IDDQHP: 1.15 mA (Typ)
    • Output Power, THD+N ≤ 1%: 20 mW (Typ)
  • Stereo Class D Speaker Amplifier RL = 8Ω
    • Output Power, THD+N ≤ 1%, LSVDD = 5.0V: 1.37 W (Typ)
    • Output Power, THD+N ≤ 1%, LSVDD = 3.6V: 680 mW (Typ)
    • Efficiency: 90% (Typ)

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  • Class G Ground Referenced Headphone Outputs
  • E2S Class D Amplifier
  • No Clip Function
  • Power Limiter Speaker Protection
  • I2C Volume and Mode Control
  • Advanced Click-and-Pop Suppression
  • Micro-Power Shutdown

Key Specifications

  • Class G Headphone Amplifier, HPVDD = 1.8V, RL = 32Ω
    • IDDQHP: 1.15 mA (Typ)
    • Output Power, THD+N ≤ 1%: 20 mW (Typ)
  • Stereo Class D Speaker Amplifier RL = 8Ω
    • Output Power, THD+N ≤ 1%, LSVDD = 5.0V: 1.37 W (Typ)
    • Output Power, THD+N ≤ 1%, LSVDD = 3.6V: 680 mW (Typ)
    • Efficiency: 90% (Typ)

All trademarks are the property of their respective owners.

The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.

The headphone amplifiers feature TI’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E2S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions.

The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm)

The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.

The headphone amplifiers feature TI’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E2S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions.

The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm)
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* 資料表 Stereo Audio w/Class G Headphone Amp & Class D Speaker Amp w/Speaker Protection datasheet (Rev. A) 2013/4/6

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