TPA311

The TPA311 is a bridge-tied load (BTL) or ingle-ended (SE) audio power amplifier developed specially for low-voltage applications here internal speakers and external earphone peration are required. Operating with a 3.3-V upply, the TPA311 can deliver 250-mW of ontinuous power into a BTL 8- load at less than 1% THD+N throughout voice band frequencies. Although his device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as ellular communications. The BTL configuration eliminates the need for external coupling capacitors on the utput in most applications, which is particularly important for small battery-powered equipment. A unique eature of the TPA311 is that it allows the amplifier to switch from BTL to SE on the fly when an earphone drive s required. This eliminates complicated mechanical switching or auxiliary devices just to drive the external load. his device features a shutdown mode for power-sensitive applications with special depop circuitry to virtually liminate speaker noise when exiting shutdown mode and during power cycling. The TPA311 is available in an pin SOIC surface-mount package and the surface-mount PowerPAD MSOP, which reduces board space by 0% and height by 40%.