sD audio amplifier available in a TQFN3x3-16 pins package. The internal gain setting can minimize the external component count and save the PCB space. For the flexible application, the gain can be set to 6dB or 12dB by GAIN control pin. High PSRR and differential architecture provide increase immunity to noise and RF rectification. In addition to these features, short start-up time and small package size make the APA2600 an ideal choice for cellular handsets, PDA, and notebook PCs. The APA2600 is suitable for battery power appication because its operating voltage is from 2.4V to 5V and has very low shutdown current. The filter-free architecture eliminates the output filter compared to the traditional Class-D audio amplifier, and reduces the external component counts. The APA2600 also integrates the de-pop circuitry that reduces the pops and click noises during power on/ off or shutdown enable process. The APA2600 is capable of driving 2.8 W at 5 V or 570 mW at 2.4 V into 4W speaker. In addition, it provides thermal and over-current protections. Features G