Linear Technology
DC544A - LT1934ES6/LT1934ES6-1 Demo Board | 2 Circuits, 4.5V ≤ VIN ≤ 34V, Vout = 3.3V/5V @ 250mA (LT1934) and 50mA (LT1934-1)
Manual
LT1934 - Product Info
LTspice - Software