105V, 2.3A Low-EMI Synchronous Step-Down Regulator

Today, many electronic systems require power processing at higher voltages, while simultaneously demanding increased efficiency and low EMI/EMC emissions. The LTC7103 meets all of these challenges, with an unprecedented combination versatility and simplicity.

The LTC7103 is a 105V, 2.3A, synchronous step-down regulator that incorporates a proprietary architecture in a small 5mm × 6mm QFN package to achieve ultra-low EMI/EMC emissions without sacrificing efficiency. Operating from an input voltage between 4.4V and 105V, the LTC7103 has a no-load input current of only 2µA when regulating 48VIN to 3.3VOUT.

A low minimum on-time of 40ns, together with 100% maximum duty cycle operation, allow practical use at any output voltage between 1V and VIN. Switching frequency can be set between 200kHz and 2MHz and synchronized anywhere over this range use the internal phase-locked loop.

Utilizing a unique average current mode architecture, the LTC7103 offers fast and accurate output current programming and monitoring without the need for an external sense resistor. Eight, pin-selectable fixed output voltages and optional internal loop compensation save board space and quiescent current while making the LTC7103 extremely easy to use.