High Efficiency Low-Side Controller with True Shutdown - LM3017


High Efficiency Low-Side Controller with True Shutdown



The LM3017 is a versatile low-side NFET controller incorporating true shutdown and input side current limiting. It 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 5V to 18V accommodates a two or three cell lithium ion battery or a 12V 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 40nA from the input supply.

The LM3017 provides an adjustable output in order 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 QFN package.


  • 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
  • 1A Push-pull Driver for Low-side NFET
  • Peak Current Mode Control
  • Simple Slope Compensation
  • Protection Features: Thermal Shutdown, Cycle-by-cycle Current
    Limit, Short Circuit Protection, Output Overvoltage Protection
    and Latch-off
  • Internal Soft-start
  • 2.4mm × 2.7mm × 0.8mm 10-pin QFN Package

Key Specification

  • Input Voltage Range of 5V to 18V
  • 600 kHz fixed Frequency Operation
  • ±1% Reference Voltage Accuracy Over Temperature
  • Low Shutdown Current (< 1µA), 40nA Typical

View more

Parametrics Compare all products in Boost Controller (External Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Special Features
Iout (Max) (A)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Approx. Price (US$)
LM3017 LM3478 LM3481 LM3488
5     2.97     2.97     2.97    
18     40     48     40    
6     1.26     1.275     1.26    
20     500     500     500    
1     10     10     10    
1     1     1     1    
400     100     100     100    
400     1000     1000     1000    
0.001     2.7     3.7     2.7    
Load Disconnect    
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable    
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
1     10     10     10    
85     100     85     100    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog    
0.95 | 1ku     0.80 | 1ku     0.80 | 1ku     0.80 | 1ku    

Related end equipment

  • 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

  • Get more help

  • Device selection assistance
  • Production, ordering, and quality
New! Interactive Design
Click to instantly view a schematic, charts, Bill of Materials, and Operating Values.

WEBENCH® Designer LM3017

  Min   Max Range
Vin  V 5.0 to 18.0V
Vout  V 5.5 to 120.0V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C

Footprint BOM Cost Efficiency

Preview design