LM49153 - Mono Audio Subsys w/ class G Headphone Amp Class D Speaker Amp Noise Gate & Speaker Protection

The LM49153 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of Texas Instruments' PowerWise family of products, the LM49153 combines an earpiece switch, a high efficiency 25mW class G headphone amplifier, and a high efficiency 1.35W class D loudspeaker into a single device.

The headphone amplifiers feature Texas Instruments' class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The class D amplifier features an ALC (Automatic Level Control) with a noise gate that provides both no-clip and speaker protection.

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 LM49153 is available in an ultra-small 25-bump 0.4mm pitch DSBGA package (2.30mm x 2.42mm).

Products containing the "LM49153" keyword are: LM49153TME , LM49153TME/NOPB , LM49153TME/NOPB , LM49153TMEVAL , LM49153TMX , LM49153TMX/NOPB , LM49153TMX/NOPB

• Class G Ground Referenced Headphone Outputs
• High Efficiency Class D Amplifier with Spread Spectrum
• No Clip
• Speaker Protection
• Noise Gate
• I²C Volume and Mode Control
• Advanced Click-and-Pop Suppression
• Micro-Power Shutdown

Key Specifications

• Class G Headphone Amplifier,
  HPV_DD = 1.8V, R_L = 32Ω
  • IDDQ_HP, 1.2mA (Typ)
  • P_OUT, THD+N ≤ 1%, 25mW (Typ)
  • HP V_OS, 0.5mV (Typ)
• Mono Class D Speaker Amplifier,
  R_L = 8Ω, THD+N < 1%
  • P_OUT, LSV_DD = 5.0V, 1.35W (Typ)
  • P_OUT, LSV_DD = 3.6V, 680mW (Typ)
  • Efficiency 88% (Typ)

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