FDA903U-KBT

Overview

The FDA903U-KBT is a single-bridge Class-D digital input automotive power amplifier designed for car audio, telematics, and e-call applications. It integrates a high-performance D/A converter with powerful MOSFET outputs in Class-D configuration, achieving outstanding efficiency of 90%. The device supports a wide operating supply range from 3.3 V to 18 V, compatible with standard car battery levels and load dump pulses. It features I2S and TDM digital inputs with sampling frequencies up to 192 kHz, full I2C bus driving, and integrated diagnostics including open load and DC offset detection.

Feature Summary

• Integrates a high-performance D/A converter with powerful MOSFET outputs for compact and efficient audio amplification
• Supports wide voltage operation from 3.3 V to 18 V, suitable for various automotive power environments
• Features complete diagnostic array including innovative open load and DC offset detection in play mode
• Configurable via I2C bus interface with optional legacy mode operation without I2C

Applications

• Car radio audio systems
• Telematics units
• e-Call emergency systems
• Noise and tone generators

Procurement Notes

Verify the specific suffix 'KBT' against official STMicroelectronics documentation to confirm package type, temperature grade, and reel specifications. Ensure compatibility with existing board designs regarding the PowerSSO-36 slug-up package dimensions and thermal requirements. Confirm that the integrated D/A converter and digital input interfaces match the system's audio source requirements.

Selection Notes

Select this component for applications requiring high efficiency and integrated digital-to-analog conversion in a compact form factor. The wide voltage range makes it suitable for direct battery connection or step-down generated voltages. Consider the integrated diagnostics and EMI solutions if deploying within standard single DIN car-radio boxes alongside tuners.

Part Context

The FDA903U belongs to STMicroelectronics' family of advanced BCD technology automotive amplifiers. It is designed to replace discrete solutions by integrating the DAC, control logic, and power stage into a single chip. This integration reduces board space and simplifies design while maintaining high audio quality through feedback loops that include the output L-C low-pass filter.

Replacement Considerations

Check for FDA803U as a potential variant within the same family, noting differences in current monitoring capabilities. Verify pinout and software compatibility if migrating from previous generation FDA series amplifiers.