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LM4675

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具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 级扬声器放大器

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LM4675

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产品详情

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) 2.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 2.8 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 82 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) 2.7 SNR (dB) 97 THD + N at 1 kHz (%) 0.03 Iq (typ) (mA) 2.8 Control interface Hardware Closed/open loop Open Analog supply (min) (V) 2.4 Analog supply voltage (max) (V) 5.5 PSRR (dB) 82 Operating temperature range (°C) -40 to 85
DSBGA (YZR) 9 3.0625 mm² 1.75 x 1.75 WSON (NGQ) 8 9 mm² 3 x 3
  • Spread Spectrum Architecture Reduces EMI
  • 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 0.5mm Pitch DSBGA and WSON Packages

Key Specifications

  • Efficiency at 3.6V, 400mW into 8Ω Speaker: 89% (typ)
  • Efficiency at 3.6V, 100mW into 8Ω Speaker: 80% (typ)
  • Efficiency at 5V, 1W into 8Ω Speaker: 89% (typ)
  • Quiescent Current, 3.6V Supply: 2.2mA (typ)
  • Total Shutdown Power Supply Current: 0.01µA (typ)
  • Single Supply Range: 2.4V to 5.5V
  • PSRR, f = 217Hz: 82dB

All trademarks are the property of their respective owners.

  • Spread Spectrum Architecture Reduces EMI
  • 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 0.5mm Pitch DSBGA and WSON Packages

Key Specifications

  • Efficiency at 3.6V, 400mW into 8Ω Speaker: 89% (typ)
  • Efficiency at 3.6V, 100mW into 8Ω Speaker: 80% (typ)
  • Efficiency at 5V, 1W into 8Ω Speaker: 89% (typ)
  • Quiescent Current, 3.6V Supply: 2.2mA (typ)
  • Total Shutdown Power Supply Current: 0.01µA (typ)
  • Single Supply Range: 2.4V to 5.5V
  • PSRR, f = 217Hz: 82dB

All trademarks are the property of their respective owners.

The LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4675 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 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.

The LM4675 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 89% at 400mW output power.

The LM4675 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 LM4675 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 LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4675 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 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.

The LM4675 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 89% at 400mW output power.

The LM4675 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 LM4675 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.
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类型 标题 下载最新的英语版本 日期
* 数据表 Ultra-Low EMI, Fltrles, 2.65W, Mono, ClassD Audio Pwr Amp w/Sprd Spectrum 数据表 (Rev. C) 2013年 5月 1日
应用手册 Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) 2019年 8月 26日
应用手册 AN-1849 An Audio Amplifier Power Supply Design (Rev. C) 2019年 6月 27日
应用手册 AN-1737 Managing EMI in Class D Audio Applications (Rev. A) 2013年 5月 1日

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评估板

LM4675SDBD — 超低 EMI、免滤波、2.65W、单声道、D 类音频功率放大器 (LLP-8)

The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. National's new spread spectrum technology has been integrated with the latest BOOMER performance characteristics in a 0.5mm pitch, micro SMD package. The LM4675 is designed for high output, low EMI and space saving (...)

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DSBGA (YZR) 9 Ultra Librarian
WSON (NGQ) 8 Ultra Librarian
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