FDA903U 1 x 45 W class D digital input automotive power amplifier with I current Load 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 3RZHU662 6OXJ XS radio, telematics and e-call, noise and tone * * 36 generators, etc). The FDA903U integrates a high performance D/A Features converter together with powerful MOSFET AEC-Q100 qualified outputs in class D, so it is very compact and Integrated 108 dB D/A conversion powerful, moreover it reaches outstanding 2 efficiency performances (90%). I S and TDM digital input (4/8/16CH TDM) Input sampling frequency: 44.1 kHz, 48 kHz, It has a very wide operating range: it can be 96 kHz, 192 kHz operated both with standard car battery levels 2 Full I C bus driving (3.3/1.8 V) (5.5-18 V operating, compatible to load dump pulse) and with external step-down generated CISPR 25 - Class V (Fourth edition) voltages or emergency battery (since it is Very low quiescent current compatible to minimum 3.3 V operative). Output lowpass filter included in the feedback allowing outstanding audio performances The feedback loop includes the output L-C low- Wide operating supply range from 3.3 to 18 V, pass filter, allowing superior frequency response suitable for car radio, telematics and e-call linearity and lower distortion. MOSFET power outputs allowing high output 2 FDA903U is configurable through I C bus power capability interface and integrates a complete diagnostics 1 x 25 W /4 14.4 V, 1 kHz THD = 1% array specially intended for automotive 1 x 30 W /4 14.4 V, 1 kHz THD = 10% applications including innovative open load and 2 loads driving DC offset detection in play mode. 2 Power limiting function (configurable through I C) Thanks to the solutions implemented to solve the 2 I C bus diagnostics: EMI problems, the device is intended to be used Short to V /GND in the standard single DIN car-radio box together CC with the tuner. Short load and open load detection (also in play mode) Moreover FDA903U features a configurable Four thermal warnings power limiting function, and can be optionally 2 DC offset detector (also in play) and hot spot operated under no I C mode ( legacy mode ). detection T able 1. Device summary Clipping detector Integrated thermal protection Order code Package Packing 2 Legacy mode ( no I C mode), 4 configurable FDA903U-KBT Tape & reel PowerSSO-36 settings (Slug-up) FDA903U-KBX Tube Short circuit and ESD integrated protections Package: PowerSSO-36 exposed pad up July 2019 DS12498 Rev 2 1/80 This is information on a product in full production. www.st.comContents FDA903U Contents 1 Block diagram 8 2 Pins description 9 3 Application diagram 11 4 Electrical specifications . 12 4.1 Absolute maximum ratings 12 4.2 Thermal data 12 4.3 Electrical characteristics 12 4.4 Typical curves of the main electrical parameters . 15 5 General information 22 5.1 LC filter design . 22 5.2 Load possibilities . 22 6 Finite state machine 23 6.1 Device state and address selection . 24 6.2 Standby state 25 6.3 Diagnostic Vcc-Gnd state . 25 6.4 ECO-mode state 25 6.5 MUTE-PLAY and diagnostic states . 26 6.6 Operation compatibility vs battery 27 7 Muting function architecture . 28 7.1 Command dependence 28 7.2 Analog-Mute . 29 7.3 Digital-Mute . 29 7.4 Mixed mute advantages 30 8 Hardware mute pin . 32 9 Power limiter function . 33 9.1 Power limiter control . 34 2/80 DS12498 Rev 2