Automotive-Grade, Constant-Current 2.0 AALT80800PWM Dimmable Synchronous Buck LED Driver VIN VIN VOUT VIN Boot BOOT Charger C VIN IN TON CBOOT On-Time Gate L1 Select R Driver SW ON On-Time R EN SENSE Buck 17 ms Converter VCCINPGND Duty Cycle VOUT VCC Control LED+ LDO Up to 14 mA LED CSH external load C Internal 5.0 V bias CBIAS Current Differential VCSREG V Amp CSL RADJ CC UVLO PWM PWM CLED V ALT80800 REF ADIM ADIM i_LED (0 – 200 mV) reference VIN Other Faults FDSET + LED Open VCC - Fault FFn REF1 LED Short Fault FFn VOUT Fault Handling SGNDFigure 2: Functional Block Diagram 4 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Document Outline Features and Benefits Description Applications Package Typical Application Circuit Selection Guide Specifications Absolute Maximum Ratings Thermal Characteristics Pinout Diagrams and Terminal List Tables Functional Block Diagrams Electrical Characteristics Functional Description Application Circuit Diagrams
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