The TPA321 is a bridging load (BTL) audio power amplifier developed specifically for low-voltage applications requiring built-in speakers. The 8-pin SOIC surface mount package and surface Mount PowerPAD™MSOP reduce board space by 50% and height by 40%. Using a 3.3v power supply, the TPA321 can deliver 250 mW of continuous power to the BTL 8-Ω load at less than 1% THD+N over the entire voice band frequency.
Although the device features at 20 KHZ, its operation is optimized for narrowband applications such as cellular communications. In most applications, the BTL configuration eliminates the need for external coupled capacitors at the output, which is especially important for small battery-powered devices. The device has a shutdown mode for power sensitive applications with a static current of 0.15µa during shutdown.
Test Circuit
This integrated circuit can be damaged by ESD. Texas Instruments recommends handling all integrated circuits with appropriate precautions. Failure to follow proper operation and installation procedures may cause damage. Electrostatic damage can range from minor performance degradation to complete equipment failure. Precision integrated circuits may be more susceptible to damage because very small parameter changes can cause the device to fail to meet its published specifications.
Features
● Fully Specified for 3.3-V and 5-V Operation
● Wide Power Supply Compatibility 2.5V to 5.5V
● Output Power for RL = 8 Ω
- 350 mW at VDD = 5 V
- 250 mW at VDD = 3.3V
● Ultralow Supply Current in Shutdown Mode.. 0.15 µA
● Thermal and Short-Circuit Protection
● Surface-Mount Packaging
- SOIC
- PowerPAD™ MSOP
