High Efficiency Low-Side Controller with True Shutdown

The LM3017 device is a versatile low-side NFET controller incorporating true shutdown and

input side current limiting. The LM3017 is designed for simple implementation of boost conversions

in Thunderbolt™ Technology. The LM3017 can also be configured for flyback or SEPIC designs. The

input voltage range of 5 V to 18 V accommodates a two- or three-cell lithium ion battery or a 12-V

rail. The enable pin accepts a single input to drive three different modes of operation: boost,

pass-through, or shutdown mode. The LM3017 draws very low current in shutdown mode, typically 40 nA

from the input supply.

The LM3017 provides an adjustable output to drive the Power Load Switch or MUX for the

host Thunderbolt™ port. The ability to drive an external high-side NMOS provides for true isolation

of the load from the input. Current limiting on the input ensures that inrush and short-circuit

currents are always under control. The LM3017 incorporates built-in thermal shutdown,

cycle-by-cycle current limit, short-circuit protection, output overvoltage protection, and soft

start. It is available in a 10-pin WQFN package.