SLVSCM2D October   2014  – December 2019 TPS1H100-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematic
  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 Timing Requirements – Current Sense Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 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 Accurate Current Sense
      2. 7.3.2 Programmable Current Limit
      3. 7.3.3 Inductive-Load Switching-Off Clamp
      4. 7.3.4 Full Protections and Diagnostics
        1. 7.3.4.1  Short-to-GND and Overload Detection
        2. 7.3.4.2  Open-Load Detection
        3. 7.3.4.3  Short-to-Battery Detection
        4. 7.3.4.4  Reverse-Polarity Detection
        5. 7.3.4.5  Thermal Protection Behavior
        6. 7.3.4.6  UVLO Protection
        7. 7.3.4.7  Loss of GND Protection
        8. 7.3.4.8  Loss of Power Supply Protection
        9. 7.3.4.9  Reverse Current Protection
        10. 7.3.4.10 Protection for MCU I/Os
      5. 7.3.5 Diagnostic Enable Function
    4. 7.4 Device Functional Modes
      1. 7.4.1 Working Mode
  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 Distinguishing of Different Fault Modes
        2. 8.2.2.2 AEC Q100-012 Test Grade A Certification
        3. 8.2.2.3 EMC Transient Disturbances Test
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Without a GND Network
      2. 10.2.2 With a GND Network
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    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

7.3.1 Accurate Current Sense

For version B, the high-accuracy current-sense function is internally implemented, which allows a better real-time monitoring effect and more-accurate diagnostics without further calibration. A current mirror is used to source 1 / K of the load current, flowing out to the external resistor between the CS pin and GND, and reflected as voltage on the CS pin.

K is the ratio of the output current and the sense current. It is a constant value across the temperature and supply voltage. Each device was internally calibrated while in production, so post-calibration by users is not required in most cases.

TPS1H100-Q1 K_ratio_lvscm2.gifFigure 29. Current-Sense Accuracy

Ensure the CS voltage is in the linear region (0 to 4 V) during normal operation. Calculate RCS with Equation 1.

Equation 1. TPS1H100-Q1 eq_01_lvscm2.gif

Also, when a fault condition occurs, CS works as a diagnostics report pin. When an open load or short to battery occurs in the on-state, VCS almost equals 0. When current limit, thermal shutdown/swing, open load, or short to battery in the off-state occurs, the voltage is pulled up to VCS,h. Figure 30 shows a typical current-sense voltage according to the operating conditions, including fault conditions.

TPS1H100-Q1 typ_curr_sense_V_lvscm2.gifFigure 30. Voltage Indication on the Current-Sense Pin
TPS1H100-Q1 sch_I_sense_limit_lvscm2.gifFigure 31. Current-Sense and Current-Limit Block Diagram