1. General description
The SA58670A is a stereo, filter-free class-D audio amplifier which is available in an
HVQFN20 package with the exposed Die Attach Paddle (DAP).
The SA58670A features independent shutdown controls for each channel. The gain may
beset at 6 dB,12 dB,18 dB or 24 dBwith 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 SA58670A 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 SA58670A provides thermal and
short-circuit shutdown protection.
2. Features
nOutput power:
u2.1 W/channel into 4 Ω at 5.0 V
u1.4 W/channel into 8 Ω at 5.0 V
u720 mW/channel into 8 Ω at 3.6 V
nSupply voltage: 2.5 V to 5.5 V
nIndependent shutdown control for each channel
nSelectable gain: 6 dB, 12 dB, 18 dB and 24 dB
nHigh SVRR: −77 dB at 217 Hz
nFast start-up time: 3.5 ms
nLow supply current
nLow shutdown current
nShort-circuit and thermal protection
nSpace savings with 4 mm ×4 mm HVQFN20 package
nLow junction to ambient thermal resistance of 24 K/W with exposed DAP
3. Applications
nWireless and cellular handset and PDA
nPortable DVD player
nUSB speaker
nNotebook PC
nPortable radio and gaming
SA58670A