LM49151 - Mono Class D Subsys w/ Earpiece Drv, Gnd Ref Headph Amp, Speaker Protection & No Clip w/ Clip Cn

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 8Ω 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.

Products containing the "LM49151" keyword are: LM49151TL , LM49151TL/NOPB , LM49151TL/NOPB , LM49151TLX , LM49151TLX/NOPB , LM49151TLX/NOPB

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

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