The MAX13300/MAX13302 combine four high-efficiency Class D amplifiers with integrated diagnostic hardware for reliable automotive audio systems. The MAX13300/ MAX13302 deliver up to 50W at 10% THD+N per channel into 2Ω when operating from a 14.4V supply. The internal diagnostics evaluate each channel’s output impedance to check for shorts across the outputs, to the battery, or to ground. The I²C interface allows the system to query critical device parameters such as device temperature and output clipping. The devices are programmable to four different I²C addresses. The audio amplifiers feature single-ended analog inputs with a common negative input. Three gain settings are internally adjustable through the I²C interface to 13dB, 21.6dB, and 26dB. The Class D amplifier has 10 programmable switching frequencies between 300kHz and 750kHz. The BTL outputs are protected against short circuits and thermal overload. The outputs can be configured as a 2-, 3-, or 4-channel amplifier. All the devices provide 50V load-dump protection, and are offered in the thermally enhanced, 48-pin TSSOP-EPR package operating over the -40°C to +125°C temperature range. Applications * Active Loudspeaker Systems * Car Stereo * Discrete Amplifier Modules * Mobile Surround Systems * Radio Head Units * Rear-Seat Entertainment Units * High Output Power (10% THD+N) * 2 x 100W into 1Ω at 14.4V * 4 x 50W into 2Ω at 14.4V * 4 x 30W into 4Ω at 14.4V * 2 Channels Can Be Paralleled * Feedback After the Filter * Improves THD+N * Low Output Impedance * High-Frequency Response * Improved Damping of Complex Loads * Enables Low-Cost Inductors * 100dB SNR * Low 0.04% THD+N * 70dB PSRR * On-Board Diagnostics * Short-to-Battery/GND * Open/Shorted Load * Tweeter Detect * Protection and Monitoring Functions: * Short-Circuit Protection * 50V Load-Dump Protection * Programmable Clip Detection * DC Offset Detection * Open Battery/GND Tolerant * Thermal-Overload Protection * Thermal Warning Indication * Four-Address I²C Control Interface * Low-Power Shutdown Mode * Up to 90.5% Efficiency * -40°C to +125°C Ambient Operating Temperature * 48-Pin TSSOP-EPR (Top Side Exposed Pad) Package * AEC-Q100 Qualified