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TAS2770: How to reduce power consumption

Part Number: TAS2770

Can we drive a piezo buzzer using TAS2770. 

The issue with speaker is we need about 300mA current to drive the speaker to get about 60dbA @ 1meter distance when speaker is inside the product.

We want to reduce the current but still get the same SPL

So we are exploring buzzer option without changing any h/w.

Or if any other type of buzzers if suggested, that consume lesser current to the same SPL is also good for us to try it out.