ADP1821 PWM buck controller uses 15.2 V to 16.8 V for the input voltage

ADP1821 is a versatile, dual output, interleaved, synchronous PWM buck controller that generates two independent outputs from an input voltage of 3.0 V to 18 V. Each channel can be configured to provide output voltage from 0.6V to 85% of the input voltage. The two channels operate 180 out of phase, which reduces the current stress on the input capacitor and allows the use of a smaller and lower cost input capacitor