SLVSB90B January   2012  – December 2014 TPS40170-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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  LDO Linear Regulators and Enable
      2. 7.3.2  Input Undervoltage Lockout (UVLO)
      3. 7.3.3  Equations for Programming the Input UVLO
      4. 7.3.4  Overcurrent Protection and Short-Circuit Protection (OCP and SCP)
      5. 7.3.5  Oscillator and Voltage Feed-Forward
        1. 7.3.5.1 Calculating the Timing Resistance (RRT)
      6. 7.3.6  Feed-Forward Oscillator Timing Diagram
      7. 7.3.7  Soft-Start and Fault-Logic
        1. 7.3.7.1 Soft-Start During Overcurrent Fault
        2. 7.3.7.2 Equations for Soft-Start and Restart Time
      8. 7.3.8  Overtemperature Fault
      9. 7.3.9  Tracking
      10. 7.3.10 Adaptive Drivers
      11. 7.3.11 Start-Up Into Pre-Biased Output
      12. 7.3.12 Power Good (PGOOD)
      13. 7.3.13 PGND and AGND
      14. 7.3.14 Bootstrap Capacitor
      15. 7.3.15 Bypass and Filtering
    4. 7.4 Device Functional Modes
      1. 7.4.1 Frequency Synchronization
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Select A Switching Frequency
        2. 8.2.2.2  Inductor Selection (L1)
        3. 8.2.2.3  Output Capacitor Selection (C9)
        4. 8.2.2.4  Peak Current Rating of Inductor
        5. 8.2.2.5  Input Capacitor Selection (C1, C6)
        6. 8.2.2.6  MOSFET Switch Selection (Q1, Q2)
        7. 8.2.2.7  Timing Resistor (R7)
        8. 8.2.2.8  UVLO Programming Resistors (R2, R6)
        9. 8.2.2.9  Bootstrap Capacitor (C7)
        10. 8.2.2.10 VIN Bypass Capacitor (C18)
        11. 8.2.2.11 VBP Bypass Capacitor (C19)
        12. 8.2.2.12 SS Timing Capacitor (C15)
        13. 8.2.2.13 ILIM Resistor (R19, C17)
        14. 8.2.2.14 SCP Multiplier Selection (R5)
        15. 8.2.2.15 Feedback Divider (R10, R11)
        16. 8.2.2.16 Compensation: (R4, R13, C13, C14, C21)
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bootstrap Resistor
    2. 9.2 SW-Node Snubber Capacitor
    3. 9.3 Input Resistor
    4. 9.4 LDRV Gate Capacitor
  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 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    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

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 1C
    • Device CDM ESD Classification Level C4B
  • 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
  • Bidirectional Frequency Synchronization With Master and 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
  • Power Good
  • ENABLE With 1-µA Low-Current Shutdown
  • 8-V and 3.3-V LDO Output
  • Integrated Bootstrap Diode
  • 20-Pin 4.5-mm × 3.5-mm VQFN (RGY) Package

2 Applications

  • Advanced Driver Assistance System (ADAS)
  • Automotive Infotainment and Cluster

3 Description

The TPS40170-Q1 device is a full-featured, synchronous PWM buck controller that operates at an input voltage between 4.5 V and 60 V and is optimized for high-power-density, high-reliability dc-dc converter applications. The controller implements voltage-mode control with input-voltage feed-forward compensation that enables instant response to an input voltage change. The switching frequency is programmable from 100 kHz to 600 kHz.

The TPS40170-Q1 device has a complete set of system protection and monitoring features such as programmable UVLO, programmable overcurrent protection (OCP) by sensing the low-side FET, selectable short-circuit protection (SCP) by sensing the high-side FET, and thermal shutdown. The ENABLE pin allows for system shutdown in a low-current (1-µA typical) mode. The controller supports pre-biased output, provides an open-drain PGOOD signal, and has closed-loop soft-start, output-voltage tracking, and adaptive dead-time control.

The TPS40170-Q1 device provides accurate output-voltage regulation within 1% accuracy. Additionally, the controller implements a novel scheme of bidirectional synchronization with one controller acting as the master and other downstream controllers acting as slaves, synchronized to the master in-phase or 180° out-of-phase. Slave controllers can be synchronized to an external clock within ±30% of the free-running switching frequency.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS40170-Q1 VQFN (20) 4.50 mm × 3.50 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

v09219_lus970.gif

4 Revision History

Changes from A Revision (March 2012) to B Revision

  • Added Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

Changes from * Revision (January 2012) to A Revision

  • Changed RHDHI, RHDLO and RLDLO MAX valuesGo
  • Changed IILIM and IILIM(ss) valuesGo