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
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