Linear Technology’s LTC3810 is a synchronous stepdown switching regulator controller that can directly step down voltages from 100 V, to output voltages ranging from 0.8 V to 93% of VIN. This single inductor design eliminates the need for a transformer. The device employs a constant on-time valley current mode control architecture to deliver very low duty cycles and extremely fast transient response with accurate cycle-by-cycle current limit without requiring a sense resistor.
The LTC3810's 1-Ω gate drivers minimize MOSFET switching losses at high frequency and high voltage. The switching frequency is selectable from 100 kHz to 1MHz or can be synchronized to an external source over the same range. The device can also be configured for pulse skipping to maintain high efficiency at light loads. It is offered in a 28-lead SSOP package. Pricing for 1000 pieces is $3.50 each.