The MAX9730 is a mono Class G power amplifier with an integrated inverting charge-pump power supply. The charge pump can supply up to 500mA of peak output current over a 2.7VDC to 5.5VDC supply voltage range, guaranteeing up to 2.4W output power into an 8Ω load. The MAX9730 maximizes battery life by offering high-performance efficiency. Maxim’s proprietary output stage provides efficiency levels greater than Class AB devices without the EMI penalties commonly associated with Class D amplifiers. High efficiency allows the MAX9730 to be packaged in a WLP package without derating the output power handling capability. The device utilizes fully differential inputs and outputs, comprehensive click-and-pop suppression, shutdown control, and soft-start circuitry. The MAX9730 is fully specified over the -40°C to +85°C extended temperature range and is available in ultra-small, lead-free, 20-bump WLP (2mm x 2.5mm) and 28-pin TQFN (4mm x 4mm) packages.
The MAX9730 is a single‑supply Class G audio power amplifier that integrates an inverting charge‑pump power supply. It operates from 2.7 V to 5.5 V, provides up to 500 mA peak charge‑pump current, and delivers up to 2.4 W into an 8 Ω load while maintaining high efficiency and click‑free operation.
The device is offered in ultra‑small 20‑bump WLP and 28‑pin TQFN packages, supports fully differential inputs, includes shutdown and soft‑start circuitry, and meets a –40 °C to +85 °C temperature range. Detailed electrical characteristics, pin descriptions, and typical application circuits are provided for designers.
| Maximum Output Power | 2.4 W into 8 Ω |
|---|---|
| Efficiency (VCC=5 V, POUT=1 W) | 63 % |
| Quiescent Current (I_CC) | 81 µA |
Up to 2.4 W of output power.
The efficiency is 63 %.