FDA903U 1 x 45 W class D digital input automotive power amplifier with ILoad current monitoring, wide voltage operation range for car audio and telematic Datasheet - production data Description The FDA903U is a single bridge class D amplifier, designed in the most advanced BCD technology, intended for any automotive audio application (car radio, telematics and e-call, noise and tone generators, etc). AEC-Q100 qualified Integrated 108 dB D/A conversion I2S and TDM digital input (4/8/16CH TDM) Input sampling frequency: 44.1 kHz, 48 kHz, 96 kHz, 192 kHz Full I2C bus driving (3.3/1.8 V) CISPR 25 - Class V (Fourth edition) Very low quiescent current Output lowpass filter included in the feedback allowing outstanding audio performances Wide operating supply range from 3.3 to 18 V, suitable for car radio, telematics and e-call MOSFET power outputs allowing high output power capability – 1 x 25 W /4 Ω @ 14.4 V, 1 kHz THD = 1% – 1 x 30 W /4 Ω @ 14.4 V, 1 kHz THD = 10% 2 Ω loads driving Power limiting function (configurable through I2C) I2C bus diagnostics: – Short to VCC/GND – Short load and open load detection (also in play mode) – Four thermal warnings DC offset detector (also in play) and 'hot spot' detection Clipping detector Integrated thermal protection Legacy mode ('no I2C' mode), 4 configurable settings Short circuit and ESD integrated protections Package: PowerSSO-36 exposed pad up July 2019 This is information on a product in full production. The FDA903U integrates a high performance D/A converter together with powerful MOSFET outputs in class D, so it is very compact and powerful, moreover it reaches outstanding efficiency performances (90%). It has a very wide operating range: it can be operated both with standard car battery levels (5.5-18 V operating, compatible to load dump pulse) and with external step-down generated voltages or emergency battery (since it is compatible to minimum 3.3 V operative). The feedback loop includes the output L-C lowpass filter, allowing superior frequency response linearity and lower distortion. FDA903U is configurable through I2C bus interface and integrates a complete diagnostics array specially intended for automotive applications including innovative open load and DC offset detection in play mode. Thanks to the solutions implemented to solve the EMI problems, the device is intended to be used in the standard single DIN car-radio box together with the tuner. Moreover FDA903U features a configurable power limiting function, and can be optionally operated under no I2C mode ('legacy mode'). Table 1. Device summary Order code Tape & reel

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Typical curves of the main electrical parameters . . . . . . . . . . . . . . . . . . . 15 LC filter design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Load possibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Finite state machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.1 6.2 Diagnostic Vcc-Gnd state . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Relation with short circuit protection activation . . . . . . . . . . . . . . . . . . . 36 Diagnostic time-line diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Open load in play detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 10.4.1 Open load in play detector operation overview . . . . . . . . . . . . . . . . . . . 40 Processing bandwidth range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Audio signal evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Input offset detector...

Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Instruction bytes- “I00xxxxx” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Data bytes - “I01xxxxx” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 PowerSSO-36 (slug-up) package information . . . . . . . . . . . . . . . . . . . . . 76 PowerSSO-36 (slug up) marking information . . . . . . . . . . . . . . . . . . . . . . 78

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List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Figure 35. Figure 36. Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. Figure 42. Figure 43. Figure 44. Figure 45. Figure 46. Figure 47. Figure 48. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . ....

Figure 49. Figure 50. Figure 51. Figure 52. Figure 53. Figure 54. Figure 55. Figure 56. Figure 57. Figure 58. Figure 59. Figure 60. Figure 61. Figure 62. Figure 63. Figure 64. Figure 65. Figure 66. Figure 67. Figure 68. Figure 69. Figure 70. Figure 71. Figure 72. Figure 73. Figure 74. Figure 75. Figure 76. Figure 77. Figure 78. Load range detection configured properly setting IB5 d7-d6 . . . . . . . . . . . . . . . . . . . . . . . 36 DC diagnostic before turn on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Short to VCC at device turn on . ....

Block diagram Block diagram Figure 1. Block diagram