Targeting the makers of LCD monitors, all-in-one PCs and video projectors, the PAM8009 from Diodes Incorporated is a 3W stereo class-D audio amplifier and class-AB headphone driver. Featuring power-limit technology for speaker protection and an advanced dc volume control for precise 64-step gain adjustment, this amplifier minimizes external components to achieve a highly-integrated solution in compact 20-pin QFN or 24-pin SOP packages. With an output power rating of up to 2.4W/channel into 4Ω bridge-tied speakers at a THD+N of 1% (up to 3W at 10% THD+N), the PAM8009 provides a high-power, low-cost capability for driving the typical small internal speakers found in these types of application.
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A separate connection provides for single-ended driving of stereo headphones with a power output of 60mW into 32Ω loads. A dc volume control with hysteresis allows for gain adjustment from -80dB to +20dB in 64 steps. Automatic gain control and under-voltage protection functions prevent speaker damage due to output clipping and will shut down the amplifier before an input device generates a ‘pop’.
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