The MAX98500 is a high-efficiency, Class D audio amplifier that features an integrated boost converter to deliver a constant output power over a wide range of battery supply voltages. It has automatic level control with a battery tracking function that reduces the output swing as the supply voltage drops, preventing collapse of battery voltage. The MAX98500 also features three selectable gain settings. This product is suitable for applications such as cell phones, smartphones, GPS devices, mobile internet devices, and active speaker accessories.
The MAX9850 is a high‑efficiency Class D audio amplifier that integrates a 2 MHz boost converter to maintain constant output power across a wide battery voltage range. It offers three selectable gain settings (6 dB, 15.5 dB, 20 dB) and automatic level control that reduces output swing as the supply voltage drops, protecting the battery.
The document provides electrical characteristics, typical operating curves, pin descriptions, and layout recommendations. It includes guidance on component selection for the boost converter, grounding, and PCB routing to minimize EMI and achieve optimal audio performance.
| Output Power | 2.2 W into 8 Ω, 10 % THD+N |
|---|---|
| Efficiency | 87 % |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Switching Frequency | 2 MHz |
| Gain Settings | 6 dB, 15.5 dB, 20 dB |
| Operating Temperature Range | -40 °C to +85 °C |
| Recommended Inductor | 2.2 µH nominal |
The device operates over a wide supply voltage range of 2.5 V to 5.5 V.
It provides three gain settings—6 dB, 15.5 dB, and 20 dB—selectable via the GAIN input pin (ground, unconnected, or V_BAT respectively).
The amplifier achieves a total efficiency of about 87 % under typical conditions.
A nominal inductance of 2.2 µH is recommended for the boost converter.