Linear Technology has announced LT3686, a 1.2A, 37Vin step-down switching regulator.

It operates down to 3.6Vin and has over-voltage lockout, protecting the regulator and load from transients as high as 55V, making it suitable for automotive load dump and cold-crank conditions, as well as 24V industrial supplies.

Its internal 1.85A (680mV) switch can deliver up to 1.2A of continuous output current at voltages as low as 0.8V.
Low minimum on-time enables it to offer high switching frequencies with high step-down ratios. For example: at 16V and 2MHz it can deliver a 3.3V.

The switching frequency is user-programmable from 300kHz to 2.5MHz, and constant frequency switching is maintained at light loads.

A catch diode current sense pin protects the circuit during input voltage transients even at high switching frequencies.
Packaging is 3x3mm DFN-10.

For more info, see www.linear.com