3.3W Mono Class DG Multilevel Audio Amplifier

The MAX98307/MAX98308 fully differential mono Class DG multilevel power amplifiers with integrated inverting charge pumps offer highly efficient, high-power audio solutions for portable applications.

Class DG multilevel modulation extends the dynamic range of the output signal by employing a charge-pump-generated negative rail as needed to extend the supply voltage. This scheme results in high efficiency over a wide output power range.

The ICs combine Maxim's active emissions limiting edge rate and overshoot control circuitry with multilevel output modulation to greatly reduce EMI. These features eliminate the need for output filtering as compared to traditional Class D devices, reducing component count and cost.

The MAX98307's 16-pin TQFN package features an adjustable gain set by external resistors. The MAX98308's space-saving 12-bump WLP package features an internally fixed gain of 8.5dB, 11.5dB, 14.5dB, 17.5dB, and 20.5dB set by a single gain input. Both devices operate over the extended -40°C to +85°C temperature range.

Applications

* Cellular Phones * Notebook Computers * Portable Audio * Smartphones * Tablet PCs * VoIP Phones

* High Efficiency Combined with High Output Power

* Class DG Multilevel Modulation Ensures Maximum Efficiency Over Wide Output Power Range

* Improves Battery Life

* Low 1.85mA Quiescent Current

* High Output Power at 1% THD+N

* 1.54W at VPVDD = 3.6V, 8Ω + 68µH Load

* 2.85W at VPVDD = 5V, 8Ω + 68µH Load

* High Output Power at 10% THD+N

* 1.77W at VPVDD = 3.6V, 8Ω + 68µH Load

* 3.3W at VPVDD = 5V, 8Ω + 68µH Load

* 84% Efficiency (VPVDD = 3.6V, at 500mW Output)

* Active Emissions Limiting and Class DG Multilevel Output Modulation Eliminates EMI Output Filtering Requirement

* Integrated Charge Pump and High Efficiency Results in Small Solution Size

* Excellent RF Immunity

* Click-and-Pop Suppression

* Thermal and Overcurrent Protection

* Low-Current Shutdown Mode