General description
The SA58671 is a stereo, filter-free class-D audio amplifier which is available in a 16 bump WLCSP (Wafer Level Chip-Size Package).
The SA58671 features independent shutdown controls for each channel. The gain can be set at 6 dB, 12 dB, 18 dB or 24 dB using 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 very small WLCSP package makes it an ideal choice for both cellular handsets and PDAs.
The SA58671 delivers 1.3 W/channel at 5 V and 720 mW/channel at 3.6 V into 8 Ω. It delivers 1.2 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 SA58671 provides thermal and short-circuit shutdown protection.

Features
■ Output power:
   ◆ 1.2 W/channel into 4 Ω at 5 V
   ◆ 1.3 W/channel into 8 Ω at 5 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 2.06 mm × 2.11 mm 16 bump WLCSP package
■ Low junction to ambient thermal resistance of 110 K/W with adequate heat sinking of
   WLCSP

Applications
■ Wireless and cellular handsets and PDA
■ Portable DVD player
■ USB speaker
■ Notebook PC