General description
The SA58670 is a stereo, filter-free Class D audio amplifier which is available in an HVQFN20 package with the exposed Die Attach Paddle (DAP).
The SA58670 features independent shutdown controls for each channel. The gain may be set at 6 dB, 12 dB, 18 dB or 24 dB utilizing G0 and G1 gain select pins. Improved immunity to noise and RF rectification is increased by high PSRR and differential circuit topology. Fast start-up time and small package, makes it an ideal choice for both cellular handsets and PDAs.
The SA58670 delivers 1.4 W/channel at 5 V and 720 mW/channel at 3.6 V into 8 Ω. It delivers 2.1 W/channel at 5 V into 4 Ω. The maximum power efficiency is excellent at 70 % to 74 % into 4 Ω and 84 % to 88 % into 8 Ω. The SA58670 provides thermal and short circuit shutdown protection.

FEATUREs
■ Output power
■ 2.1 W/channel into 4 Ω at 5 V
■ 1.4 W/channel into 8 Ω at 5 V
■ 720 mW/channel into 8 Ω at 3.6 V
■ Power supply range: 2.5 V to 5.5 V
■ Independent shutdown control for each channel
■ Selectable gain of 6 dB, 12 dB, 18 dB and 24 dB
■ High PSSR: 77 dB at 217 Hz
■ Fast start-up time of 3.5 ms
■ Low supply current
■ Low shutdown current
■ Short-circuit and thermal protection
■ Space savings with 4 mm × 4 mm HVQFN20 package
■ Low junction to ambient thermal resistance of 24 K/W with exposed die attach paddle

APPLICATIONs
■ Wireless and cellular handsets and PDAs
■ Portable DVD player
■ USB speakers
■ Notebook PC
■ Portable radio and gaming