SA58670BS音频放大器 2.1W/CH CLASS D类

1. 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 with gain select pins G0 and G1. 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 5.0 V and 720 mW/channel at 3.6 V into 8 Ω. It

delivers 2.1 W/channel at 5.0 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.

■ Output power:

◆ 2.1 W/channel into 4 Ω at 5.0 V

◆ 1.4 W/channel into 8 Ω at 5.0 V

◆ 720 mW/channel into 8 Ω at 3.6 V

■ Supply voltage: 2.5 V to 5.5 V

■ Independent shutdown control for each channel

■ Selectable gain: 6 dB, 12 dB, 18 dB and 24 dB

■ High SVRR: −77 dB at 217 Hz

■ Fast start-up time: 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 DAP

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