FDA803U-KBT

Overview

The FDA803U-KBT is a single-channel Class D automotive power amplifier manufactured by STMicroelectronics. It operates within a supply voltage range of 3.3V to 18V and delivers up to 45W into a 2-ohm load. The device features integrated digital-to-analog conversion with I2S and TDM inputs, supporting sampling frequencies up to 192 kHz. It includes comprehensive diagnostics via an I2C bus, such as short-to-VCC/GND, open/short load detection, and thermal warnings. Qualified under AEC-Q100 standards, it functions reliably between -40°C and 125°C in a PowerSSO-36 package.

Feature Summary

• Integrates high-performance 108 dB D/A conversion with I2S and TDM digital input interfaces for direct digital audio processing.
• Provides extensive diagnostic capabilities including open load and DC offset detection during playback, accessible via the I2C bus.
• Complies with CISPR 25 Class V standards to minimize electromagnetic interference in automotive environments.
• Features configurable power limiting and legacy mode operation for flexible system integration.

Applications

• Car radio systems
• Automotive telematics units
• E-call emergency communication modules

Procurement Notes

Verify the specific suffix 'KBT' against official STMicroelectronics documentation to confirm tape-and-reel packaging and exact marking codes. Ensure compatibility with existing PCB footprints for the PowerSSO-36 package. Confirm that the design supports the required I2C voltage levels (1.8V or 3.3V) for proper configuration and diagnostic access.

Selection Notes

Select this component for applications requiring a compact, single-channel solution with integrated digital audio interfaces. It is suitable where space constraints prevent external DACs and where robust automotive-grade diagnostics are mandatory. Consider the wide supply voltage range if the application involves varying battery conditions or step-down converter outputs.

Part Context

This part belongs to the FDA803U family of Class D amplifiers designed for automotive use. The family utilizes advanced BCD technology to combine powerful MOSFET outputs with digital control logic. These devices are engineered to replace traditional analog amplifiers, offering higher efficiency and reduced component count by integrating filtering and conversion stages directly on-chip.

Replacement Considerations

Direct substitutes include other FDA803U variants with different packaging options, such as FDA803U-KBX (tube). Verify pinout compatibility and software configuration requirements when migrating between packaging types. No alternative functional equivalents from other manufacturers are confirmed in the provided data.