JAJSGF1C October   2018  – June 2021 LM5143-Q1

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 概要 (続き)
  6. 6 Pin Configuration and Functions
    1. 6.1 Wettable Flanks
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Input Voltage Range (VIN)
      2. 8.3.2  High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
      3. 8.3.3  Enable (EN1, EN2)
      4. 8.3.4  Power Good Monitor (PG1, PG2)
      5. 8.3.5  Switching Frequency (RT)
      6. 8.3.6  Clock Synchronization (DEMB)
      7. 8.3.7  Synchronization Out (SYNCOUT)
      8. 8.3.8  Spread Spectrum Frequency Modulation (DITH)
      9. 8.3.9  Configurable Soft Start (SS1, SS2)
      10. 8.3.10 Output Voltage Setpoint (FB1, FB2)
      11. 8.3.11 Minimum Controllable On-Time
      12. 8.3.12 Error Amplifier and PWM Comparator (FB1, FB2, COMP1, COMP2)
      13. 8.3.13 Slope Compensation
      14. 8.3.14 Inductor Current Sense (CS1, VOUT1, CS2, VOUT2)
        1. 8.3.14.1 Shunt Current Sensing
        2. 8.3.14.2 Inductor DCR Current Sensing
      15. 8.3.15 Hiccup Mode Current Limiting (RES)
      16. 8.3.16 High-Side and Low-Side Gate Drivers (HO1/2, LO1/2, HOL1/2, LOL1/2)
      17. 8.3.17 Output Configurations (MODE, FB2)
        1. 8.3.17.1 Independent Dual-Output Operation
        2. 8.3.17.2 Single-Output Interleaved Operation
        3. 8.3.17.3 Single-Output Multiphase Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Standby Modes
      2. 8.4.2 Diode Emulation Mode
      3. 8.4.3 Thermal Shutdown
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Power Train Components
        1. 9.1.1.1 Buck Inductor
        2. 9.1.1.2 Output Capacitors
        3. 9.1.1.3 Input Capacitors
        4. 9.1.1.4 Power MOSFETs
        5. 9.1.1.5 EMI Filter
      2. 9.1.2 Error Amplifier and Compensation
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1 – High Efficiency, Dual-Output Buck Regulator for Automotive Applications
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 9.2.1.2.2 Custom Design With Excel Quickstart Tool
          3. 9.2.1.2.3 Inductor Calculation
          4. 9.2.1.2.4 Current-Sense Resistance
          5. 9.2.1.2.5 Output Capacitors
          6. 9.2.1.2.6 Input Capacitors
          7. 9.2.1.2.7 Compensation Components
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Design 2 – Two-Phase, Single-Output Buck Regulator for Automotive ADAS Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedures
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Power Stage Layout
      2. 11.1.2 Gate-Drive Layout
      3. 11.1.3 PWM Controller Layout
      4. 11.1.4 Thermal Design and Layout
      5. 11.1.5 Ground Plane Design
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
      3. 12.1.3 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
        1. 12.2.1.1 PCB Layout Resources
        2. 12.2.1.2 Thermal Design Resources
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 サポート・リソース
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

9.2.1.1 Design Requirements

Table 9-2 shows the intended input, output, and performance parameters for this automotive design example.

Table 9-2 Design Parameters
DESIGN PARAMETER VALUE
Input voltage range (steady-state) 8 V to 18 V
Min transient input voltage (cold crank) 3.5 V
Max transient input voltage (load dump) 36 V
Output voltages 3.3 V, 5 V
Output currents 7 A
Switching frequency 2.1 MHz
Output voltage regulation ±1%
Standby current, output 1 enabled, no-load < 50 µA
Shutdown current 4 µA

The switching frequency is set at 2.1 MHz by resistor RRT. In terms of control loop performance, the target loop crossover frequency is 60 kHz with a phase margin greater than 50°. The output voltage soft-start times are set at 2 ms by 68-nF soft-start capacitors.

The selected buck regulator powertrain components are cited in Table 9-3, and many of the components are available from multiple vendors. The MOSFETs in particular are chosen for both lowest conduction and switching power loss, as discussed in detail in Section 9.1.1.4. This design uses a low-DCR, metal-powder composite inductor, and ceramic output capacitor implementation.

Table 9-3 List of Materials for Application Circuit 1 (1)
REFERENCE DESIGNATOR QTY SPECIFICATION MANUFACTURER PART NUMBER
CIN 4 10 µF, 50 V, X7R, 1210, ceramic, AEC-Q200 Taiyo Yuden UMJ325KB7106KMHT
10 µF, 50 V, X7S, 1210, ceramic, AEC-Q200 Murata GCM32EC71H106KA03
TDK CGA6P3X7S1H106M
CO 8 47 µF, 6.3 V, X7R, 1210, ceramic, AEC-Q200 Murata GCM32ER70J476KE19L
Taiyo Yuden JMK325B7476KMHTR
47 µF, 6.3 V, X7S, 1210, ceramic, AEC-Q200 TDK CGA6P1X7S0J476M
LO1, LO2 2 0.68 µH, 4.8 mΩ, 25 A, 7.3 × 6.6 × 2.8 mm, AEC-Q200 Würth Electronik 744373460068
0.68 µH, 4.5 mΩ, 22 A, 6.95 × 6.6 × 2.8 mm, AEC-Q200 Cyntec VCMV063T-R68MN2T
0.68 µH, 3.1 mΩ, 20 A, 7 × 6.9 × 3.8 mm, AEC-Q200 Würth Electronik 744311068
0.68 µH, 7.4 mΩ, 12.2 A, 5.4 × 5.0 × 3 mm, AEC-Q200 TDK SPM5030VT-R68-D
0.68 µH, 2.9 mΩ, 15.3 A, 6.71 × 6.51 × 3.1 mm, AEC-Q200 Coilcraft XGL6030-681
Q1, Q2, Q3, Q4 4 40 V, 5.7 mΩ, 9 nC, SON 5 × 6, AEC-Q101 Infineon IPC50N04S5L-5R5
RS1, RS2 2 Shunt, 7 mΩ, 0508, 1 W, AEC-Q200 Susumu KRL2012E-M-R007
U1 1 LM5143-Q1 65-V dual-channel buck controller, AEC-Q100 Texas Instruments LM5143QRGWRQ1