1 Features

1• Fully Compliant to Thunderbolt™ Technology

Specifications

• True Shutdown for Short-Circuit Protection

• Input Side Current Limit

• Single Enable Pin With Three Modes of

Operation: Boost, Pass-Through, or Shutdown

• Built-in Charge Pump for High-Side NFET

Disconnect Switch

• 1-A Push-Pull Driver for Low-Side NFET

• Peak Current Mode Control

• Simple Slope Compensation

• Protection Features: Thermal Shutdown, Cycleby-

Cycle Current Limit, Short-Circuit Protection,

Output Overvoltage Protection, and Latch-Off

• Internal Soft Start

• Input Voltage Range: 5 V to 18 V

• 600-kHz Fixed Frequency Operation

• ±1% Reference Voltage Accuracy Over

Temperature

• Low Shutdown Current (< 1 μA), 40 nA Typical

• 2.4 mm × 2.7 mm × 0.8 mm, 10-Pin WQFN

Package

2 Applications

• Thunderbolt™ Technology Host Ports

• Notebook and Desktop Computers, Tablets, and

Other Portable Consumer Electronics

• Hard Disc Drives, Solid-State Drives

• Offline Power Supplies

• Set-Top Boxes

3 Description

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.