DC1389A - LTC3521EUF Demo Board | Buck-Boost Plus Dual Buck, 2.4V ≤ VIN ≤ 5V, Vout1 = 3.3V @ 0.8A, Vout2=1.2V @ 0.6A, Vout3 = 1.8V @ 0.6A
Manual LTC3521 - Product Info LTspice - Software