AP68355Q

AP68355Q is a Diodes Incorporated non-synchronous buck converter in an SO-8EP package — the 3.5 A member of the AP68x5Q automotive wide-input buck family, accepting 5.5 V to 80 V input with output adjustable from 1.2 V to 50 V, switching at 300 kHz under constant-on-time control. It is AEC-Q100 Grade 1 qualified for vehicle rails that see load-dump and cold-crank transients. Per datasheet DS47151 (shared with the AP68255Q), the orderable code is AP68355QSP-13 on tape and reel. Selection advice: choose the 3.5 A code over the 2.5 A AP68255Q on this site when the rail feeds several downstream loads or a low output voltage pushes duty cycle and diode stress up — the pair share package and control architecture, so the step is a BOM change, not a redesign, but re-verify inductor saturation and freewheel-diode dissipation at the higher current. The non-synchronous topology keeps the design simple and robust at 80 V; where efficiency at full load dominates, compare a synchronous alternative on a lower-voltage rail. Parameters verified against Diodes Incorporated documentation.