SNVS499I February   2007  – November 2023 LM5116

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 Performance 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 Enable
      3. 6.3.3 UVLO
      4. 6.3.4 Oscillator and Sync Capability
      5. 6.3.5 Error Amplifier and PWM Comparator
      6. 6.3.6 Ramp Generator
      7. 6.3.7 Current Limit
      8. 6.3.8 HO Output
      9. 6.3.9 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Soft-Start and Diode Emulation
  8. 7 Application and Implementation
    1. 7.1 Application Information
    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  Timing Resistor
        3. 7.2.2.3  Output Inductor
        4. 7.2.2.4  Current Sense Resistor
        5. 7.2.2.5  Ramp Capacitor
        6. 7.2.2.6  Output Capacitors
        7. 7.2.2.7  Input Capacitors
        8. 7.2.2.8  VCC Capacitor
        9. 7.2.2.9  Bootstrap Capacitor
        10. 7.2.2.10 Soft Start Capacitor
        11. 7.2.2.11 Output Voltage Divider
        12. 7.2.2.12 UVLO Divider
        13. 7.2.2.13 MOSFETs
        14. 7.2.2.14 MOSFET Snubber
        15. 7.2.2.15 Error Amplifier Compensation
        16. 7.2.2.16 Comprehensive Equations
          1. 7.2.2.16.1 Current Sense Resistor and Ramp Capacitor
          2. 7.2.2.16.2 Modulator Transfer Function
          3. 7.2.2.16.3 Error Amplifier Transfer Function
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design with WEBENCH® Tools
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 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

7.2.1 Design Requirements

The procedure for calculating the external components is illustrated with the following design example. The Bill of Materials for this design is listed in Table 7-1. The circuit shown in Figure 7-1 is configured for the following specifications:

  • Output voltage = 5 V
  • Input voltage = 7 V to 60 V
  • Maximum load current = 7 A
  • Switching frequency = 250 kHz

Simplified equations are used as a general guideline for the design method. See Comprehensive Equations.

Table 7-1 Bill of Materials for 7-V – 60-V Input, 5-V 7-A Output, 250 kHz
ID Part Number Type Size Parameters Qty Vendor
C1, C2, C14 C2012X7R1E105K Capacitor, Ceramic 0805 1 µF, 25 V, X7R 3 TDK
C3 VJ0603Y103KXAAT Capacitor, Ceramic 0603 0.01 µF, 50 V, X7R 1 Vishay
C4 VJ0603A271JXAAT Capacitor, Ceramic 0603 270 pF, 50 V, COG, 5% 1 Vishay
C5, C15 VJ0603Y101KXATW1BC Capacitor, Ceramic 0603 100 pF, 50 V, X7R 2 Vishay
C6 VJ0603Y332KXXAT Capacitor, Ceramic 0603 3300 pF, 25 V, X7R 1 Vishay
C7 Capacitor, Ceramic 0603 Not ssed 0
C8, C9, C10, C11 C4532X7R2A225M Capacitor, Ceramic 1812 2.2 µF, 100 V X7R 4 TDK
C12 C3225X7R2A105M Capacitor, Ceramic 1210 1 µF, 100 V X7R 1 TDK
C13 C2012X7R2A104M Capacitor, Ceramic 0805 0.1 µF, 100 V X7R 1 TDK
C16, C17, C18, C19, C20 C4532X6S0J107M Capacitor, Ceramic 1812 100 µF, 6.3 V, X6S, 105°C 5 TDK
C21, C22 Capacitor, Tantalum D Case Not used 0
C23 Capacitor, Ceramic 0805 Not used 0
D1 CMPD2003 Diode, Switching SOT-23 200 mA, 200 V 1 Central Semi
D2 CMPD2003 Diode, Switching SOT-23 Not used 0 Central Semi
JMP1 Connector, Jumper 2 pin sq. post 1
L1 HC2LP-6R0 Inductor 6 µH, 16.5 A 1 Cooper
P1-P4 1514-2 Turret Terminal .090” dia. 4 Keystone
TP1-TP5 5012 Test Point .040” dia. 5 Keystone
Q1, Q2 Si7850DP N-CH MOSFET SO-8 Power PAK 10.3 A, 60 V 2 Vishay Siliconix
R1 CRCW06031023F Resistor 0603 102 kΩ, 1% 1 Vishay
R2 CRCW06032102F Resistor 0603 21.0 kΩ, 1% 1 Vishay
R3 CRCW06033741F Resistor 0603 3.74 kΩ, 1% 1 Vishay
R4 CRCW06031211F Resistor 0603 1.21 kΩ, 1% 1 Vishay
R5 Resistor 0603 Not used 0
R6, R7 CRCW06030R0J Resistor 0603 0 Ω 2 Vishay
R8 CRCW0603103J Resistor 0603 10 kΩ, 5% 1 Vishay
R9 CRCW06031242F Resistor 0603 12.4 kΩ, 1% 1 Vishay
R10 CRCW0603183J Resistor 0603 18 kΩ, 5% 1 Vishay
R11 LRC-LRF2010-01-R010-F Resistor 2010 0.010 Ω, 1% 1 IRC
R12 Resistor 0603 Not used 0
R13 CRCW0603105J Resistor 0603 1 MΩ, 5% 1 Vishay
R14 Resistor 1206 Not used 0
U1 LM5116MHX Synchronous Buck Controller HTSSOP-20 1 TI