The TPA2028D1 device is a mono, filter-free Class-D audio power amplifier with volume
control, fast gain ramp SmartGain, dynamic range compression
(DRC), and automatic gain control (AGC). It is available in a 1.63 mm × 1.63 mm wafer chip-scale
The DRC/AGC function in the TPA2028D1 device is programmable through a digital
I2C interface. The DRC/AGC function can be configured to automatically
prevent distortion of the audio signal and enhance quiet passages that are normally not heard. The
DRC/AGC can also be configured to protect the speaker from damage at high power levels and compress
the dynamic range of music to fit within the dynamic range of the speaker. The gain can be selected
from 28 dB to +30 dB in 1-dB steps. The TPA2028D1 is capable of driving 3 W at 5 V into a
4-Ω load or 880 mW at 3.6 V into an 8-Ω load. The device features hardware and software
shutdown controls and also provides thermal and short-circuit protection. The TPA2028D1 has a
faster AGC gain ramp during start-up than TPA2018D1.
In addition to these features, a fast start-up time and small package size make the
TPA2028D1 an ideal choice for cellular handsets, PDAs and other portable applications.
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