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.


  • 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, Cycle-by-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

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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)
Iout (Max) (A)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
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   
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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

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