The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49151 combines a 1.25W mono E²S class D amplifier, 125mW Class AB earpiece driver, 42mW/channel stereo ground referenced headphone drivers, volume control, input mixer/multiplexer, and speaker protection into a single device.

The LM49151 class D speaker amplifier features Texas Instruments' unique Automatic Level Control (ALC) that provides both a I²C programmable no-clip feature with Clip Controls and speaker protection. The E²S (Enhanced Emission Suppression) class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency while delivering 1.25W into an 8? load with <1% THD+N with a 5V supply. The 42mW/channel headphone drivers feature Texas Instruments' ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost.

The LM49151 features separate volume controls for the loudspeaker and headphone inputs. Mode selection, shutdown control, and volume are controlled through an I²C compatible interface. The LM49151's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

• E2S Class D Amplifier
• Ground Referenced Outputs — Eliminates Output Coupling Capacitors
• I2C Programmable No Clip Function with Clip Control
• Voltage Limiter Speaker Protection
• I2C Volume and Mode Control
• Ear Piece Amplifier
• Advanced Click-and-Pop Suppression
• Low Supply Current
• Micro-Power Shutdown
• 20-bump DSBGA Package

Key Specifications

• Output Power at VDD = 3.3V THD+N ≤ 1%
  • LS Mode, RL = 8? 520mW (Typ)
  • HP Mode, RL = 32Ω 40mW (Typ)
• Output Power at VDD = 5V THD+N ≤ 1%
  • LS Mode, RL = 8? 1.25W (Typ)
  • HP Mode, RL = 32? 42mW (Typ)
• Output Offset
  • LS Mode 15 6mV (Typ)
  • HP Mode 15 2mV (Typ)

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• Audio input type
• Analog Input
• Architecture
• Class-D
• Speaker channels (Max)
• Mono
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2.7
• Load (Min) (ohms)
• 8
• Output power (W)
• 1.25
• SNR (dB)
• 102
• THD + N @ 1 kHz (%)
• 0.015
• Iq (Typ) (mA)
• 4
• Control interface
• I2C
• Closed/open loop
• Open
• Analog supply (Min) (V)
• 1.7
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 91
• Operating temperature range (C)
• -40 to 85

LM49151的完整型号有：LM49151TL/NOPB、LM49151TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM49151TL/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-20，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LM49151TL/NOPB的批量USD价格：1.021（1000+）

LM49151TLX/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-20，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LM49151TLX/NOPB的批量USD价格：.851（1000+）

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