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