General Description
G1421 is a stereo audio power amplifier in 24pin TSSOP thermal pad package. It can drive 1.8W continuous RMS power into 4Ω load per channel in Bridge-Tied Load (BTL) mode at 5V supply voltage. Its THD is smaller than 1% under the above operation condition. To simplify the audio system design in the notebook application, G1421 supports the Bridge-Tied Load (BTL) mode for driving the speakers, Single-End (SE) mode for driving the headphone. In the HP-IN mode, it can support a DC value to the phone-jacket and drive the headphone without the audio amplifier outputs coupling capacitors. G1421 can mute the output when Mute-In is activated. For the low current consumption applications, the SHDN mode is supported to disable G1421 when it is idle. The current consumption can be further reduced to below 5µA.

Features
■ Depop Circuitry Integrated
■ Output Power at 1% THD+N, VDD=5V
    --1.8W/CH (typical) into a 4Ω Load
    --1.2W/CH (typical) into a 8Ω Load
■ Eliminates Headphone Amplifier Output Coupling Capacitors
■ Maximum Output Power Clamping Circuitry Integrated
■ Bridge-Tied Load (BTL), Single-Ended (SE), and Stereo Headphone Amplifier (HP-IN) modes Supported
■ Stereo Input MUX
■ Mute and Shutdown Control Available
■ Surface-Mount Power Package 24-Pin TSSOP-P

Applications
■ Stereo Power Amplifiers for Notebooks or Desktop Computers
■ Multimedia Monitors
■ Stereo Power Amplifiers for Portable Audio Systems