The HFA80A is a new STMicroelectronics class-D audio amplifier, specifically designed for automotive applications in BCD9s technology.

The HFA80A integrates advanced solutions for an excellent radiated noise immunity combined with the advantages of 2 MHz switching PWM class-D output stages. This configuration allows outstanding audio performances while designing a compact and inexpensive application.

The HFA80A supports wide band applications with extremely low level of noise and low THD. Moreover, it features a broad diagnostics matrix able to support the most demanding OEM requirements in terms of speaker control and system robustness/reliability. The HFA80A supports start/stop cranking down to 4.5 V and is housed in a very compact and thin LQFP 7x7 package, making it suitable for any level of automotive application.

• AEC-Q100 qualified
• Supply operating range: 4.5 V - 18 V
• EMI compliant to CISPR25 level V
• Class-D BTL outputs
• Battery load dump compatible (40 V)
• Reduced size and cost of output LC thanks to 2 MHz switching PWM
• Extended audio band support
• Multiple load configurations:
  • Able to drive 4 Ω and 2 Ω speaker loads
  • Both speaker and line driver options
• MOSFET power outputs allowing high output power capability:
  • Typ 4 x 28.5 W/4 Ω at 14.4 V, 1 kHz, THD = 10%
  • Typ 4 x 23 W/4 Ω at 14.4 V, 1 kHz, THD = 1%
  • Typ 4 x 49 W/2 Ω at 14.4 V, 1 kHz, THD = 10%
  • Typ 4 x 39 W/2 Ω at 14.4 V, 1 kHz, THD = 1%
• Audio performances at 4 Ω, 14.4 V, 1 kHz:
  • THD 0.015% typ at 1 W, 1 kHz on 4 Ω loads
  • Output noise 52 typ μV at 26 dB gain
  • Crosstalk 86 dB typ at 1 W, 1 kHz on 4 Ω loads
  • PSRR 80 dB typ at 1 W, 1 kHz on 4 Ω loads
• Fast turn-on and very low latency for high-speed audio processing applications
• I²C full configurability with channel independent mute/play/gain selection/diagnostic
• 4 I²C addresses
• I²C bus driving: fast I²C (1Mhz clock) option
• Output PWM clock spread spectrum
• Full diagnostic matrix with info available both on I²C and CD/DIAG pin:
  • Independent by-channel DC and AC load detection diagnostic with selectable threshold
  • Startup diagnostic for shorts to VCC/GND
  • Overcurrent protection with configurable threshold (2 selectable)
  • Input voltage DC offset detector
  • Free-running output current offset detector
• Thermal protection and thermal warning (4 thermal warnings)
• DAM (digital admittance meter)
• Synchronization input/output pin
• Immune to pop/tick noise at turn on/off, battery variations, during diagnostic
• Legacy (backup mode without I²C control)
• ESD integrated protections (2 kV HBM, 500 V/750 V corner CDM)
• LQFP48L exposed pad up package