Linear Technology
DC970A-A - LTC3541 Demo Board | 3V ≤ VIN ≤ 5.5V, Vout1 (Buck) = 1.8V or 2.5V @ 500mA, Vout2 (VLDO) = 0.8V/1.2V/1.5V/1.8V @ 300mA
Manual
LTC3541 - Product Info
LTspice - Software