Linear Technology
DC2455A-C - LTM4650-1 Demo Board | LTM4650-1 (x4) Buck µModule Regulator, 4.5V ≤ VIN ≤ 15V, Vout = 0.9V to 1.8V @ 200A
Manual
LTM4650-1 - Product Info
LTspice - Software