A8498 Wide Input Voltage 3.0 A Step Down Regulator Features and Benefits Description 8 to 50 V input range The A8498 is a step down regulator that will handle a wide Integrated DMOS switch input operating voltage range. Adjustable fixed off-time The A8498 is supplied in a low-profile 8-lead SOIC with Highly efficient exposed pad (package LJ). Applications include: Adjustable 0.8 to 24 V output Applications with 8 to 50 V input voltage range needing buck regulator for 3.0 A output current Consumer equipment power Uninterruptible power supplies (lead acid battery charger) Automotive telematics: 9 to 16 V input, with higher voltage protection 12 V lighter-powered applications (portable DVD, etc.) Point of Sale (POS) applications Industrial applications with 24 or 36 V bus Package: 8-Lead SOIC with exposed thermal pad (suffix LJ) Approximate Scale 1:1 Typical Application +42 V CBOOT Efficiency vs. Output Current 0.01 F CIN2 CIN1 90.0 220 F 0.22 F 50 V 88.0 BOOT VIN 86.0 84.0 82.0 ENB LX L1 A8498 80.0 68 H VOUT 3.3 V / 3 A 78.0 TSET VBIAS V (V) OUT 76.0 RTSET R1 5 74.0 63.4 k7 6.34 k7 3.3 ESR 72.0 GND FB 70.0 R2 COUT 0 500 1000 1500 2000 2500 3000 D1 220 F 2 k7 25 V I (mA) OUT Circuit for 42 V step down to 3.3 V at 3 A. Efficiency data from circuit shown in left panel. Data is for reference only. A8498-DS, Rev. 2 Efficiency %A8498 Wide Input Voltage 3.0 A Step Down Regulator Absolute Maximum Ratings Characteristic Symbol Conditions Min. Typ. Max. Units Load Supply Voltage, VIN pin V 50 V IN Input Voltage, VBIAS pin V 0.3 7 V BIAS Switching Voltage V 1 V S Input Voltage Range, ENB pin V ENB Operating Ambient Temperature Range T 2085C A Junction Temperature T (max) 150 C J Storage Temperature T 55 150 C S *Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current ratings, or a junction temperature, T , of 150C. J Package Thermal Characteristics* R JA Package PCB (C/W) LJ 35 4-layer * Additional information is available on the Allegro website. Ordering Information Use the following complete part numbers when ordering: a b Part Number Packing Description A8498SLJTR-T 13 in. reel, 3000 pieces/reel LJ package, SOIC surface mount with exposed thermal pad A8498SLJ-T 98 pieces/tube a Leadframe plating 100% matte tin. b Contact Allegro for additional packing options. Allegro MicroSystems, Inc. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com