2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller

The LM3478 is a versatile Low-Side

N-Channel MOSFET controller for switching regulators. It is suitable for use in

topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc.

Moreover, the LM3478 can be operated at extremely high switching frequency in order

to reduce the overall solution size. The switching frequency of the LM3478 can be

adjusted to any value between 100kHz and 1MHz by using a single external resistor.

Current mode control provides superior bandwidth and transient response, besides

cycle-by-cycle current limiting. Output current can be programmed with a single

external resistor.

The LM3478 has built-in features such

as thermal shutdown, short-circuit protection, over voltage protection, etc. Power

saving shutdown mode reduces the total supply current to 5µA and allows power

supply sequencing. Internal soft-start limits the inrush current at start-up.