SNVS583H March   2009  – October 2018 LM5008A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application, Basic Step-Down Regulator
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Switching Characteristics
    7. 6.7 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 Control Circuit Overview
      2. 7.3.2 Start-Up Regulator (VCC)
      3. 7.3.3 Regulation Comparator
      4. 7.3.4 Overvoltage Comparator
      5. 7.3.5 On-Time Generator and Shutdown
      6. 7.3.6 Current Limit
      7. 7.3.7 N-Channel Buck Switch and Driver
      8. 7.3.8 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active 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 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Selection Of External Components
        3. 8.2.2.3 Low-Output Ripple Configurations
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Custom Design With WEBENCH® Tools
      3. 11.1.3 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
        1. 11.2.1.1 PCB Layout Resources
        2. 11.2.1.2 Thermal Design Resources
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.1 Design Requirements

A guide for determining the component values is shown in Figure 10. Table 1 lists the bill of materials for this application example. The following steps configure the LM5008A:

  • Input voltage range (VIN): 12 V to 95 V
  • Output voltage (VOUT1): 10 V
  • Load current (for continuous conduction mode): 100 mA to 300 mA

Table 1. Bill of Materials

ITEM DESCRIPTION PART NUMBER VALUE
C1 Ceramic Capacitor TDK C4532X7R2A105M 1 µF, 100 V
C2 Ceramic Capacitor TDK C4532X7R1E226M 22 µF, 25 V
C3 Ceramic Capacitor Kemet C1206C474K5RAC 0.47 µF, 50 V
C4 Ceramic Capacitor Kemet C1206C103K5RAC 0.01 µF, 50 V
C5 Ceramic Capacitor TDK C3216X7R2A104M 0.1 µF, 100 V
D1 Schottky Power Diode Diodes Inc. DFLS1100 100 V, 1 A
L1 Power Inductor COILTRONICS DR125-221-R or
TDK SLF10145T-221MR65		 220 µH
RFB2 Resistor Vishay CRCW12063011F 3.01 kΩ
RFB1 Resistor Vishay CRCW12061001F 1.0 kΩ
R3 Resistor Vishay CRCW12063R00F 3.0 Ω
RT Resistor Vishay CRCW12063243F 324 kΩ
RCL Resistor Vishay CRCW12063323F 332 kΩ
U1 Switching Regulator LM5008A