8375 8375 N/B MaintenanceN/B Maintenance
Bridge-Tied Load (BTL) or Single-Ended (SE) Modes Operation
Various 24-Pin Power Packages Available SOP , TSSOP-P
High Supply Voltage Ripple Rejection
Applications General Description
The APA2020A is a stereo bridge-tied audio power amplifier in various 24-pin power packages , including SOP ,
TSSOP-P. When connecting to a 5V voltage supply , the APA2020A is capable of delivering 1.8W/1.2W of
continuous RMS power per channel into 4!/8! loads with less than 1% THD+N, respectively. The APA2020A
simplifies design and frees up board space for other features .
Stereo Audio Power Amplifier for Notebook Computer
The APA2020A also served well in low-voltage applications , which provides 800-mW per channel into 4! loads
with a 3.3V supply voltage . Both of the depop circuitry and the thermal shutdown protection circuitry are
integrated in the APA2020A , that reduces pops and clicks noise during power up and when using the shutdown
or mute modes and protects the chip from being destroyed by over-temperature failure. To simplify the audio
system design in notebook computer applications , the APA2020A combines a stereo bridge-tied loads (BTL)
mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a single chip , where both
modes are easily switched by the SE/BTL input control pin signal . For power sensitive applications , the
APA2020A also features a shutdown function which keeps the supply current only 0.5 !gA (typ)
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