SLUS970B NOVEMBER   2013  – December 2014 TPS40170

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application
      2.      Efficiency vs. Load Current
  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 Handling 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  LDO Linear Regulators and Enable
      2. 7.3.2  Input Undervoltage Lockout (UVLO)
        1. 7.3.2.1 Equations for Programming the Input UVLO:
      3. 7.3.3  Oscillator and Voltage Feed-Forward
        1. 7.3.3.1 Calculating the Timing Resistance (RRT)
      4. 7.3.4  Overcurrent Protection and Short-Circuit Protection (OCP and SCP)
      5. 7.3.5  Soft-Start and Fault-Logic
        1. 7.3.5.1 Soft-Start During Overcurrent Fault
        2. 7.3.5.2 Equations for Soft-Start and Restart Time
      6. 7.3.6  Over-Temperature Fault
      7. 7.3.7  Tracking
      8. 7.3.8  Adaptive Drivers
      9. 7.3.9  Start-Up into Pre-Biased Output
      10. 7.3.10 Powergood (PGOOD)
      11. 7.3.11 PGND and AGND
    4. 7.4 Device Functional Modes
      1. 7.4.1 Frequency Synchronization
      2. 7.4.2 Operation Near Minimum VIN (VVIN ≤ 4.5 V)
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Bootstrap Resistor
      2. 8.1.2 SW Node Snubber Capacitor
      3. 8.1.3 Input Resistor
      4. 8.1.4 LDRV Gate Capacitor
    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  List of Materials
        3. 8.2.2.3  Select a Switching Frequency
        4. 8.2.2.4  Inductor Selection (L1)
        5. 8.2.2.5  Output Capacitor Selection (C9)
        6. 8.2.2.6  Peak Current Rating of Inductor
        7. 8.2.2.7  Input Capacitor Selection (C1, C6)
        8. 8.2.2.8  MOSFET Switch Selection (Q1, Q2)
        9. 8.2.2.9  Timing Resistor (R7)
        10. 8.2.2.10 UVLO Programming Resistors (R2, R6)
        11. 8.2.2.11 Boot-Strap Capacitor (C7)
        12. 8.2.2.12 VIN Bypass Capacitor (C18)
        13. 8.2.2.13 VBP Bypass Capacitor (C19)
        14. 8.2.2.14 VDD Bypass Capacitor (C16)
        15. 8.2.2.15 SS Timing Capacitor (C15)
        16. 8.2.2.16 ILIM Resistor (R9, C17)
        17. 8.2.2.17 SCP Multiplier Selection (R5)
        18. 8.2.2.18 Feedback Divider (R10, R11)
        19. 8.2.2.19 Compensation: (R4, R13, C13, C14, C21)
      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 Custom Design with WEBENCH Tools
    2. 11.2 Device Support
      1. 11.2.1 Third-Party Products Disclaimer
      2. 11.2.2 Related Devices
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Wide Input Voltage Range from 4.5 V to 60 V
  • 600 mV Reference Voltage with 1% Accuracy
  • Programmable UVLO and Hysteresis
  • Voltage Mode Control With Voltage Feed Forward
  • Programmable Frequency Between 100 kHz and 600 kHz
  • Bi-directional -Frequency Synchronization With Master/Slave Option
  • Low-side FET Sensing Overcurrent Protection and High-Side FET Sensing Short-Circuit Protection With Integrated Thermal Compensation
  • Programmable Closed Loop Soft-Start
  • Supports Pre-Biased Outputs
  • Thermal Shutdown at 165°C with Hysteresis
  • Voltage Tracking
  • Powergood
  • ENABLE with 1-µA Low Current Shutdown
  • 8.0-V and 3.3-V LDO Output
  • Integrated Bootstrap Diode
  • 20-Pin 3.5 mm × 4.5 mm VQFN (RGY) Package
  • Create a Custom Design with WEBENCH Tools