Dual 3A buck in a 4×4 QFN — what the ratings mean for your rail
The LTC3615IUF#PBF: Both channels switch independently from 400 kHz to 4 MHz, letting you place the switching harmonics above the passband of sensitive downstream circuitry or below the AM radio band, depending on the layout.
Board-fit and thermal — the 24-QFN exposed paddle
Synchronous rectification keeps the freewheeling diode drop out of the efficiency curve — the low-side FET's Rds(on) sets the conduction loss, so the efficiency peak sits at moderate loads rather than near zero.