SNOSC66D MARCH   2012  – September 2016 LM3017

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 True Shutdown
      2. 7.3.2 Operation of the EN/MODE Pin
      3. 7.3.3 EN/MODE Control
      4. 7.3.4 Overvoltage Protection
      5. 7.3.5 Thermal Protection
      6. 7.3.6 Current Limit Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Boost Mode
      3. 7.4.3 Standby Mode
      4. 7.4.4 Start-Up Boost Mode
      5. 7.4.5 Pass-Through Mode
      6. 7.4.6 Start-Up Pass-Through Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Programming the Output Voltage
        2. 8.2.2.2  Power Inductor Selection
        3. 8.2.2.3  Setting the Output Current
        4. 8.2.2.4  Additional Slope Compensation
        5. 8.2.2.5  Current Limit With Additional Slope Compensation
        6. 8.2.2.6  Power Diode Selection
        7. 8.2.2.7  Low-Side MOSFET Selection (Switching MOSFET)
        8. 8.2.2.8  Pass MOSFET Selection (High-Side MOSFET)
        9. 8.2.2.9  Input Capacitor Selection
        10. 8.2.2.10 Output Capacitor Selection
        11. 8.2.2.11 VCC Decoupling Capacitor
        12. 8.2.2.12 Slope Compensation Ramp
        13. 8.2.2.13 Control Loop Compensation
          1. 8.2.2.13.1 Compensation Network Components Calculations
          2. 8.2.2.13.2 Compensation Design Example
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Filter Capacitors
      2. 10.1.2 Sense Lines
      3. 10.1.3 Compact Layout
      4. 10.1.4 Ground Plane and Vias
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 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

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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM3017 WQFN (10) 2.40 mm × 2.70 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

LM3017 typ_app_cir_nosc66.gif