The TPA751 is a bridging load (offline) audio power amplifier developed specifically for low-voltage applications requiring built-in speakers. The amplifier comes in a 3.0 x 3.0 mm Microstar Primary (BGA), 8-pin SOIC surface mount package and surface mount PowerPAD MSOP. Using a 3.3v power supply, the TPA751 can deliver 250 mw of continuous power to offline 8-Ω loads at less than 0.6% (THD + N) over the entire voice band frequency.
Although the device features at 20 KHZ, its operation is optimized for narrowband applications such as wireless communications. In most applications, the off-line 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 power current of 1.5 nA when shut down.
Pin description
BTL Mode Test Circuit
TPA751 Application Circuit
Features
● Fully Specified for 3.3-V and 5-V Operation
● Wide Power Supply Compatibility 2.5 V − 5.5 V
● Power Supply Rejection at 217 Hz
− 84 dB at VDD = 5 V
− 81 dB at VDD = 3.3V
● Output Power for RL = 8 Ω
− 700 mW at VDD = 5 V
− 250 mW at VDD = 3.3V
● Ultralow Supply Current in Shutdown Mode.. 1.5 nA
● Thermal and Short-Circuit Protection
● Surface-Mount Packaging
− SOIC
− PowerPAD MSOP
− MicroStar Junior (BGA)
