LM49251 - 具有 G 类耳机放大器和 D 类扬声器放大器（带扬声器保护）的立体声音频子系统

LM49251是TI德州仪器公司的一款无产品，LM49251是具有 G 类耳机放大器和 D 类扬声器放大器（带扬声器保护）的立体声音频子系统，本站介绍了LM49251的封装应用图解、特点和优点、功能等，并给出了与LM49251相关的TI元器件型号供参考。

LM49251 - 具有 G 类耳机放大器和 D 类扬声器放大器（带扬声器保护）的立体声音频子系统 - 无 - 音频子系统 - 德州仪器

产品描述

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)

产品特性

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 = 32?
- IDDQHP: 1.15 mA (Typ)
- Output Power, THD+N ≤ 1%: 20 mW (Typ)
Stereo Class D Speaker Amplifier RL = 8?
- 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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