4-Channel, Automotive Class D Audio Amplifier

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