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  D-class Mono Audio Amp
   1.Genernal Description
The ALL-SOUND® is an Audio Amplifier Series, so that it is the most suitable LSI as a sound source output device which is used in mobile phones for high functional game sounds or quality ringing melodies, and so on.
It can be adapted to any portable devices and 1-channel speaker systems.
No additional processing hardware device or software algorithm is needed for the established bell contents (16-, 40-, 64-poly), stereo midi, MP3 and any audio contents when it is used. This device is a 2.5-W stereo bridge-tied-load (BTL) class-D amplifier designed to drive a speaker with at least 4-Ω impedance in a 1.43mm X 1.43mm Wafer Level Chip Scale Package (WLCSP).
It also allows the device to be connected directly to the speaker without the use of the LC output filter commonly associated with class-D amplifiers (this results in EMI that must be shielded at the system level). management control.
These features make the device ideal for use in devices where high efficiency is needed to extend battery run time.
The class-D BTL amplifier includes depop circuitry to reduce the amount of turnon pop at power up,
and when cycling SD#. It combines a Class-D stereo speaker amplifier delivering 700mW per channel into 4-Ω load.
It integrates the audio amplifiers, power
1. +2.7V to +5.5V Single-Supply Operation .
2. 2.5W/channel Output Power at 5V with 4-Ω load .
3. 700mW/Channel Output Power at 3.6V with 4-Ω load .
4. 84% Efficiency (RL = 8Ω, Po = 1W) .
5. Pointchips Audio enhancement .
6. Ultra low shutdown current .
7. Click and Pop Suppr