Using the LTC1149 synchronous switching regulator to deliver both 3.3V and 5V outputs is described.
Synchronous switching regulator
This design note shows how one LTC1149 synchronous switching regulator can deliver both 3.3V and 5V outputs. The design’s simplicity, low cost, and high efficiency make it a strong contender for portable, battery-powered applications. The circuit described accepts input voltages from 8V to 24V, to power any combination of 3.3V and 5V loads totalling 17W or less. For input voltages in the 8V to 16V range, the LTC1148 may be used, reducing both quiescent current and cost. For operation at input voltages below 8V, please contact ...