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.