SNVS397F September   2005  – December 2025 LM5005

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 High-Voltage Start-Up Regulator
      2. 6.3.2 Shutdown and Standby
      3. 6.3.3 Oscillator and Synchronization Capability
      4. 6.3.4 Error Amplifier and PWM Comparator
      5. 6.3.5 RAMP Generator
      6. 6.3.6 Current Limit
      7. 6.3.7 Soft-Start Capability
      8. 6.3.8 MOSFET Gate Driver
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 Standby Mode
      3. 6.4.3 Light-Load Operation
      4. 6.4.4 Thermal Shutdown Protection
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Reducing Bias Power Dissipation
      2. 7.1.2 Input Voltage UVLO Protection
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1  Custom Design With WEBENCH® Tools
        2. 7.2.2.2  Frequency Set Resistor (RT)
        3. 7.2.2.3  Inductor (LF)
        4. 7.2.2.4  Ramp Capacitor (CRAMP)
        5. 7.2.2.5  Output Capacitors (COUT)
        6. 7.2.2.6  Schottky Diode (DF)
        7. 7.2.2.7  Input Capacitors (CIN)
        8. 7.2.2.8  VCC Capacitor (CVCC)
        9. 7.2.2.9  Bootstrap Capacitor (CBST)
        10. 7.2.2.10 Soft Start Capacitor (CSS)
        11. 7.2.2.11 Feedback Resistors (RFB1 and RFB2)
        12. 7.2.2.12 RC Snubber (RS and CS)
        13. 7.2.2.13 Compensation Components (RC1, CC1, CC2)
        14. 7.2.2.14 Bill of Materials
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 PCB Layout for EMI Reduction
        2. 7.4.1.2 Thermal Design
        3. 7.4.1.3 Ground Plane Design
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Third-Party Products Disclaimer
    2. 8.2 Device Support
      1. 8.2.1 Development Support
        1. 8.2.1.1 Custom Design With WEBENCH® Tools
    3. 8.3 Documentation Support
      1. 8.3.1 Related Documentation
        1. 8.3.1.1 PCB Layout Resources
        2. 8.3.1.2 Thermal Design Resources
    4. 8.4 Receiving Notification of Documentation Updates
    5. 8.5 Support Resources
    6. 8.6 Trademarks
    7. 8.7 Electrostatic Discharge Caution
    8. 8.8 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

3 Description

The LM5005 high-voltage buck converter features all of the functions necessary to implement an efficient high-voltage switching regulator with a minimum number of external components. This easy-to-use converter operates over an input voltage range from 7V to 75V and delivers a maximum output current of 2.5A. The control loop architecture is based upon current-mode control using an emulated current ramp for high noise immunity. Current-mode control provides inherent line feed-forward, cycle-by-cycle overcurrent protection and straightforward loop compensation. The use of an emulated control ramp reduces noise sensitivity of the PWM circuit, allowing reliable control of small duty cycles necessary in high input voltage applications.

The switching frequency is resistor-programmable from 50kHz to 500kHz. To reduce EMI, an oscillator synchronization pin allows multiple LM5005 regulators to self-synchronize or be synchronized to an external clock signal. Additional protection features include configurable soft start, external power supply tracking, thermal shutdown with automatic recovery, and remote shutdown capability.

The LM5005 is available in an 20-pin HTSSOP package with an exposed pad that is soldered to the PCB to achieve a low junction-to-board thermal impedance. To create a custom regulator design, use the LM5005 with WEBENCH® Power Designer.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LM5005 PWP (HTSSOP, 20) 6.50mm × 4.40mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LM5005 Typical Application Circuit Typical Application Circuit
LM5005 Typical Efficiency, VOUT = 5V Typical Efficiency, VOUT = 5V