SNVS276I April   2004  – February 2019 LM2743

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Diagram
  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 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  Start Up and Soft-Start
      2. 7.3.2  Normal Operation
      3. 7.3.3  Tracking a Voltage Level
      4. 7.3.4  Tracking Voltage Slew Rate
      5. 7.3.5  Sequencing
      6. 7.3.6  SD Pin Impedance
      7. 7.3.7  MOSFET Gate Drivers
      8. 7.3.8  Power Good Signal
      9. 7.3.9  UVLO
      10. 7.3.10 Current Limit
      11. 7.3.11 Foldback Current Limit
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Synchronous Buck Converter Typical Application using LM2743
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Duty Cycle Calculation
          3. 8.2.1.2.3 Input Capacitor
          4. 8.2.1.2.4 Output Inductor
          5. 8.2.1.2.5 Output Capacitor
          6. 8.2.1.2.6 MOSFETs
          7. 8.2.1.2.7 Support Components
          8. 8.2.1.2.8 Control Loop Compensation
          9. 8.2.1.2.9 Efficiency Calculations
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Example Circuit 1
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Bill of Materials
      3. 8.2.3 Example Circuit 2
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Bill of Materials
      4. 8.2.4 Example Circuit 3
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
        3. 8.2.4.3 Bill of Materials
  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 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    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

8.2.3.3 Bill of Materials

Table 2. Bill of Materials

PART PART NUMBER TYPE PACKAGE DESCRIPTION VENDOR
U1 LM2743 Synchronous Controller TSSOP-14 TI
Q1 FDS6898A Dual N-MOSFET SOIC-8 20 V, 10 mΩ at 4.5 V, 16 nC Fairchild
D1 MBR0520LTI Schottky Diode SOD-123
L1 DO3316P-682 Inductor 6.8 µH, 4.4 Arms, 27 mΩ Coilcraft
CIN1 16SP100M Aluminum Electrolytic 10mm x 6mm 100 µF, 16 V, 2.89 Arms Sanyo
CO1 10SP56M Aluminum Electrolytic 6.3mm x 6mm 56 µF, 10 V, 1.7 Arms Sanyo
CCC, CBOOT, CIN2, CO2 VJ1206Y104KXXA Capacitor 1206 0.1 µF, 10% Vishay
CC3 VJ0805Y182KXXA Capacitor 805 1800 pF, 10% Vishay
CSS VJ0805A123KXAA Capacitor 805 12 nF, 10% Vishay
CC2 VJ0805A821KXAA Capacitor 805 820 pF 10% Vishay
CC1 VJ0805A330KXAA Capacitor 805 33 pF, 10% Vishay
RFB2 CRCW08051002F Resistor 805 10.0 kΩ 1% Vishay
RFB1 CRCW08053161F Resistor 805 3.16 kΩ 1% Vishay
RFADJ CRCW08051103F Resistor 805 110 kΩ 1% Vishay
RC2 CRCW08051301F Resistor 805 1.3 kΩ 1% Vishay
RCS CRCW08052101F Resistor 805 2.1 kΩ 1% Vishay
RCC CRCW080510R0F Resistor 805 10.0 Ω 1% Vishay
RC1 CRCW08053322F Resistor 805 33.2 kΩ 1% Vishay
RPULL-UP CRCW08051003J Resistor 805 100 kΩ 5% Vishay