ADP1821 PWM buck controller uses 14.4 V to 20.0 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 3.7 V to 20 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