st switch overcurrent. If required, the IC can drive an external PFET as an input-disconnect switch that is triggered by integrated current sense. SELECTION GUIDE Part Number Operating Ambient Temperature Range TA (C) Package Packing [1] Leadframe Plating A8522KLPTR-T -40 to 125 28-pin TSSOP with exposed thermal pad 4000 pieces per 13-in. reel 100% matte tin [1] Contact AllegroTM for additional packing options. Features and Benefits Description Applications Package Typical Application Drawing Selection Guide Specifications Absolute Maximum Ratings Thermal Characteristics Functional Block Diagram Pinout Diagram and Terminal List Table Electrical Characteristics Characteristic Performance Fault Handling Input Overcurrent Protection Switch Overcurrent Protection LED String Open Fault Detection Protection Against Open/Missing BOOST Diode Functional Description Enabling the IC PWM Dimming Output Current and Voltage Boost Frequency Dithering 1 1 1 1 1 2 3 3 3 4 5 6 9 14 14 15 15 16 17 17 18 18 22 Table