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 indepe ndent shutdown contro ls 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 rect ification 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 sh utdown pr ot ec tio n.
2. 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 curren t
Low shutdown current
Short-circui t an d therm al pr ot ection
Space savings with 4 mm × 4 mm HVQFN20 package
Low junction to ambient thermal resistance of 24 K/W with exposed die attach paddle
3. Applications
Wireless and cellular handsets and PDAs
Portable DVD player
USB speakers
Notebook PC
Portable radio and gaming
SA58670
2.1 W/channel stereo Class D audio amplifier
Rev. 01 — 22 June 2007 Objective data sheet
