TPA321
www.ti.com SLOS312C – JUNE 2000 – REVISED JUNE 2004 350-mW MONO AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS Fully Specified for 3.3-V and 5-V Operation
Wide Power Supply Compatibility
2.5 V – 5.5 V
Output Power for RL = 8 Ω
– 350 mW at VDD = 5 V
– 250 mW at VDD = 3.3 V
Ultralow Supply Current in Shutdown
Mode . 0.15 ВµA
Thermal and Short-Circuit Protection
Surface-Mount Packaging
– SOIC
– PowerPAD™ MSOP D OR DGN PACKAGE
(TOP VIEW) SHUTDOWN
BYPASS
IN+
IN-1 8 2 7 3 6 4 5 VOGND
VDD
VO+ DESCRIPTION
The TPA321 is a bridge-tied load (BTL) audio power amplifier developed especially for low-voltage applications
where internal speakers are required. Operating with a 3.3-V supply, the TPA321 can deliver 250 mW of
continuous power into a BTL 8-Ω load at less than 1% THD+N throughout voice band frequencies. Although this
device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as cellular …
