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)

• 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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• Audio input type
• Analog Input
• Architecture
• Class-D
• Speaker channels (Max)
• Stereo
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2.7
• Load (Min) (ohms)
• 4
• Output power (W)
• 1.37
• SNR (dB)
• 98
• THD + N @ 1 kHz (%)
• 0.02
• Iq (Typ) (mA)
• 1.15
• Control interface
• I2C
• Closed/open loop
• Open
• Analog supply (Min) (V)
• 2.7
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 93
• Operating temperature range (C)
• -40 to 85

LM49251的完整型号有：LM49251TL/NOPB、LM49251TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM49251TL/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-30，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM49251TL/NOPB的批量USD价格：1.133（1000+）

LM49251TLX/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-30，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM49251TLX/NOPB的批量USD价格：.944（1000+）

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