HFA80A-F2Y

Overview

The HFA80A-F2Y is a quad-channel, analog input Class-D BTL audio amplifier designed for automotive applications using BCD9s technology. It features a 2 MHz switching PWM frequency and supports a supply operating range of 4.5 V to 18 V, with battery load dump compatibility up to 40 V. The device delivers high output power capabilities, including typical ratings of 4 x 28.5 W into 4 Ω loads at 14.4 V (THD=10%) and 4 x 39 W into 2 Ω loads at 14.4 V (THD=1%). Audio performance specifications include a typical THD of 0.015% at 1 W on 4 Ω loads, an output noise of 52 μV at 26 dB gain, crosstalk of 86 dB, and PSRR of 80 dB. It operates within an ambient temperature range of -40 °C to 125 °C.

Feature Summary

• Advanced diagnostics matrix supporting independent channel DC/AC load detection, startup shorts detection, overcurrent protection, thermal warnings, and clipping detection via I2C or CD/DIAG pin.
• EMI compliance to CISPR25 level V achieved through 2 MHz switching PWM and spread spectrum technology, allowing reduced output LC filter size and cost.
• Full I2C configurability with four selectable addresses, enabling channel-independent mute/play/gain selection and legacy backup mode without I2C control.
• Low latency signal processing pipeline suitable for high-speed audio applications such as noise cancelling, with fast turn-on and immunity to pop/tick noise.

Applications

• Automotive in-vehicle infotainment systems requiring Hi-Fi audio quality
• Multi-speaker configurations driving 4 Ω or 2 Ω speaker loads
• Line driver applications for high impedance loads
• Noise cancelling systems due to low latency processing

Procurement Notes

Verify the specific ordering suffix F2Y corresponds to the tray packing format when sourcing components. Confirm that the LQFP48L package dimensions and exposed pad requirements align with the target PCB layout. Ensure the design accounts for the 4.5 V minimum operating voltage during start/stop cranking scenarios. Validate EMI filtering requirements against CISPR25 Level V standards given the 2 MHz switching frequency.

Selection Notes

Select this component for automotive audio designs requiring high integration and advanced diagnostic capabilities. The 2 MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the I2C interface for flexible gain and mute control. The device supports both differential and single-ended inputs without affecting gain. Verify thermal management strategies given the junction-to-case thermal resistance and maximum junction temperature limits.

Part Context

The HFA80A belongs to STMicroelectronics' portfolio of Class-D audio amplifiers tailored for the automotive sector. Built on BCD9s technology, it integrates power MOSFET outputs with digital control logic. The family emphasizes robustness against automotive electrical disturbances, including load dumps and ESD events. It is part of a broader suite of smart driving solutions aimed at enhancing vehicle connectivity and safety.

Replacement Considerations

No direct public substitute part numbers are documented in the provided datasheet. Designers should evaluate other STClass-D amplifiers based on channel count, power output, and package compatibility if replacement is necessary.

FAQ

How does the HFA80A handle EMI interference?

The device achieves EMI compliance to CISPR25 Level V through its 2 MHz switching PWM frequency combined with spread spectrum technology, which pushes PWM tones outside the AM band.

What diagnostic features are available?

It includes a broad diagnostics matrix with independent channel DC/AC load detection, startup shorts detection, overcurrent protection, thermal warnings, and a clipping detector accessible via I2C or the CD/DIAG pin.

Can the amplifier operate without I2C control?

Yes, the HFA80A supports a legacy backup mode that allows operation without I2C control, ensuring functionality even if the communication bus fails.