FDA903U-KBX

Overview

The FDA903U-KBX is a single-bridge Class D automotive power amplifier with digital input, manufactured by STMicroelectronics. It integrates a high-performance 108 dB D/A converter and powerful MOSFET outputs to achieve outstanding efficiency of 90%. The device supports I2S and TDM digital inputs with sampling frequencies up to 192 kHz. It features a wide operating supply range from 3.3 V to 18 V, compatible with standard car battery levels and load dump pulses. Output power capability includes 1 x 25 W at 4 Ω (THD=1%) and 1 x 30 W at 4 Ω (THD=10%) at 14.4 V. The unit is housed in a PowerSSO-36 slug-up package.

Feature Summary

• Integrates a high-performance 108 dB D/A converter with I2S and TDM digital input support for direct connection to audio sources.
• Features comprehensive diagnostics including open load detection during play mode, DC offset detection, clipping detection, and real-time load current monitoring via I2C.
• Includes configurable power limiting function and legacy mode operation without I2C interface requirements.
• Designed with EMI solutions compliant with CISPR 25 Class V standards for use in standard single DIN car-radio boxes.

Applications

• Car radio systems
• Telematics units
• Emergency call (e-call) systems

Procurement Notes

Verify the ordering suffix 'KBX' corresponds to tube packing as specified in the device summary table. Confirm that the component is AEC-Q100 qualified for automotive grade reliability. Ensure the design accommodates the PowerSSO-36 slug-up package thermal requirements. Check datasheet for absolute maximum ratings regarding transient supply voltage compatibility with vehicle load dump conditions.

Selection Notes

Select this component for applications requiring high output power with low distortion in a compact form factor. The integrated D/A converter simplifies system architecture by eliminating external DACs. Consider the wide supply voltage range for flexibility in battery-powered or step-down generated voltage environments. Evaluate the diagnostic capabilities for systems requiring robust fault detection and protection mechanisms.

Part Context

The FDA903U belongs to STMicroelectronics' portfolio of automotive audio power amplifiers designed for digital inputs. It utilizes advanced BCD technology to integrate digital control, analog processing, and power stages on a single chip. This integration allows for superior audio performance and reduced board space compared to discrete solutions.

Replacement Considerations

FDA903U-KBT is an alternative version of the same functional device but supplied in tape and reel packaging instead of tubes. No other direct pin-to-pin replacements are explicitly confirmed in the provided documentation.