TDA8589BJ/N3,112

Overview

The TDA8589BJ/N3,112 is an I2C-bus controlled quad audio power amplifier and multiple voltage regulator. It features four amplifiers configured in Bridge Tied Load (BTL) to drive front and rear speakers. The device includes five voltage regulators, two power switches, and comprehensive diagnostic capabilities via the I2C interface. Key specifications include a maximum output power of 46 W at 14.4 V with a 4 Ω load, and 69 W at 15.2 V with a 2 Ω load. Operating supply voltages range from 8 V to 18 V, with protection against short circuits, thermal overload, and load dumps.

Feature Summary

• I2C-bus control for independent configuration and diagnostic reading of each amplifier channel and speaker status.
• Integrated multiple voltage regulator section with selectable outputs and backup functionality for microcontroller supply stability.
• Comprehensive protection mechanisms including soft thermal clipping, low battery detection, and DC/AC load detection.
• Dual power switches providing unregulated current for auxiliary loads such as antenna motors.

Applications

• Boost amplifier and voltage regulator modules for car radios
• Power amplifier sections for CD and MD players
• Multi-channel audio systems requiring integrated diagnostics

Procurement Notes

Verify the specific suffix N3,112 corresponds to the required RoHS compliance and packaging format. Confirm that the BJ variant matches the system's voltage regulator requirements, specifically the fixed 3.3 V outputs for Regulator 2 and Regulator 3. Ensure the DBS37P package footprint aligns with the printed circuit board design before finalizing procurement.

Selection Notes

Select this component when a single IC solution is needed for both high-power audio amplification and system voltage regulation. The TDA8589BJ is suitable for applications requiring fixed 3.3 V supplies for microcontrollers and digital signal processors. Consider the BTL configuration and I2C diagnostic features if system monitoring and simplified wiring are priorities over discrete component designs.

Part Context

This part belongs to the TDA8589xJ family of automotive audio power amplifiers. It is manufactured by Philips Semiconductors, now NXP Semiconductors. The device integrates complementary quad audio power amplifiers using BCDMOS technology with a dedicated voltage regulator section. It is designed specifically for automotive environments, offering robust protection against vehicle-specific electrical disturbances.

Replacement Considerations

TDA8589J

FAQ

What is the function of the backup capacitor connected to pin BUCAP?

The backup capacitor stores energy to maintain the Regulator 2 output voltage during brief periods when the main battery supply voltage is absent, allowing the microcontroller time to prepare for a loss-of-voltage event.

How does the device handle thermal protection pre-warning?

If the average junction temperature rises to a set value, the DIAG pin goes LOW to indicate a pre-warning. If the temperature continues to rise, the device activates soft thermal clipping to reduce output power or shuts down all channels to prevent damage.