SLVSB90C January   2012  – November 2023 TPS40170-Q1

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 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  LDO Linear Regulators and Enable
      2. 6.3.2  Input Undervoltage Lockout (UVLO)
      3. 6.3.3  Equations for Programming the Input UVLO
      4. 6.3.4  Overcurrent Protection and Short-Circuit Protection (OCP and SCP)
      5. 6.3.5  Oscillator and Voltage Feed-Forward
        1. 6.3.5.1 Calculating the Timing Resistance (RRT)
      6. 6.3.6  Feed-Forward Oscillator Timing Diagram
      7. 6.3.7  Soft-Start and Fault-Logic
        1. 6.3.7.1 Soft-Start During Overcurrent Fault
        2. 6.3.7.2 Equations for Soft-Start and Restart Time
      8. 6.3.8  Overtemperature Fault
      9. 6.3.9  Tracking
      10. 6.3.10 Adaptive Drivers
      11. 6.3.11 Start-Up Into Pre-Biased Output
      12. 6.3.12 31
      13. 6.3.13 Power Good (PGOOD)
      14. 6.3.14 PGND and AGND
      15. 6.3.15 Bootstrap Capacitor
      16. 6.3.16 Bypass and Filtering
    4. 6.4 Device Functional Modes
      1. 6.4.1 Frequency Synchronization
  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  Select A Switching Frequency
        2. 7.2.2.2  Inductor Selection (L1)
        3. 7.2.2.3  Output Capacitor Selection (C9)
        4. 7.2.2.4  Peak Current Rating of Inductor
        5. 7.2.2.5  Input Capacitor Selection (C1, C6)
        6. 7.2.2.6  MOSFET Switch Selection (Q1, Q2)
        7. 7.2.2.7  Timing Resistor (R7)
        8. 7.2.2.8  UVLO Programming Resistors (R2, R6)
        9. 7.2.2.9  Bootstrap Capacitor (C7)
        10. 7.2.2.10 VIN Bypass Capacitor (C18)
        11. 7.2.2.11 VBP Bypass Capacitor (C19)
        12. 7.2.2.12 SS Timing Capacitor (C15)
        13. 7.2.2.13 ILIM Resistor (R19, C17)
        14. 7.2.2.14 SCP Multiplier Selection (R5)
        15. 7.2.2.15 Feedback Divider (R10, R11)
        16. 7.2.2.16 Compensation: (R4, R13, C13, C14, C21)
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Bootstrap Resistor
      2. 7.3.2 SW-Node Snubber Capacitor
      3. 7.3.3 Input Resistor
      4. 7.3.4 LDRV Gate Capacitor
    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. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.2 Detailed Design Procedure

Table 7-2 Design Example List of Materials
REFERENCE DESIGNATORQTYVALUEDESCRIPTIONSIZEPART NUMBERMANUF
C142.2 µFCapacitor, ceramic, 100-V, X7R, 15%1210StdStd
C61120 µFCapacitor, aluminum, 63-V, 20%, KZE series0.315 inch (0.8 cm)KZE63VB121M10X16LLChemi-con
C710.1 µFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
C92 ea22 µF
10 µF		Capacitor, ceramic, 16-V, X7R, 15%1210StdStd
C1318200 pFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
C141220 pFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
C15147 nFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
C1611 µFCapacitor, 16-V, X7R, 15%603StdStd
C1711000 pFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
C1811 µFCapacitor, ceramic, 100-V, X7R, 15%1206StdStd
C1914.7 µFCapacitor, ceramic, 16-V, X5R, 15%805StdStd
C2111500 pFCapacitor, ceramic, 50-V, X7R, 15%603StdStd
L118.2 µHInductor, SMT, 10-A, 16-mΩ0.51 inch2 (1.3 cm2)IHLP5050FDER8R2M01Vishay
Q11MOSFET, N-channel, 60-V, 50-A, 11-mΩBSC110N06NS3GInfineon
Q21MOSFET, N-channel, 60-V, 50-A, 7.6-mΩBSC076N06NS3GInfineon
R1012.74 kΩResistor, chip, 1/16W, 1%603StdR603
R413.83 kΩResistor, chip, 1/16W, 1%603StdR603
R5110.0 kΩResistor, chip, 1/16W, 1%603StdR603
R9112.1 kΩResistor, chip, 1/16W, 1%603StdR603
R11120.0 kΩResistor, chip, 1/16W, 1%603StdR603
R6122.1 kΩResistor, chip, 1/16W, 1%603StdR603
R7131.6 kΩResistor, chip, 1/16W, 1%603StdR603
R21200 kΩResistor, chip, 1/16W, 1%603StdR603
R131511 kΩResistor, chip, 1/16W, 1%603StdR603
U1IC, 4.5 V–60 V wide input sync. PWM buck controllerTPS40170-Q1RGYTexas Instruments