SLVSFW1 December   2025 TPS1HC120-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 Switching Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 ORing of EN and EN_AUX
      2. 7.3.2 Inductive-Load Switching-Off Clamp
      3. 7.3.3 Full Protections and Diagnostics
        1. 7.3.3.1  Programmable Current Limit
        2. 7.3.3.2  Short-Circuit and Overload Protection
          1. 7.3.3.2.1 Capacitive Charging
        3. 7.3.3.3  On-state Open-Load Detection
        4. 7.3.3.4  Reverse-Polarity and Reverse Battery Protection
        5. 7.3.3.5  Thermal Protection Behavior
        6. 7.3.3.6  UVLO Protection
        7. 7.3.3.7  Loss of GND Protection
        8. 7.3.3.8  Loss of Power Supply Protection
        9. 7.3.3.9  Reverse Current Protection
        10. 7.3.3.10 Protection for MCU I/Os
    4. 7.4 Device Functional Modes
      1. 7.4.1 Working Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Detailed Design Procedure
        1. 8.2.1.1 Dynamically Changing Current Limit
        2. 8.2.1.2 AEC Q100-012 Test Grade A Certification
        3. 8.2.1.3 EMC Transient Disturbances Test
      2. 8.2.2 Power Dissipation Calculation
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Examples
        1. 8.4.2.1 Without a GND Network
        2. 8.4.2.2 With a GND Network
  10. 9 Device and Documentation Support
    1. 9.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.3.1 Programmable Current Limit

A high-accuracy current limit protects the power supply during short circuit or power up and allows higher reliability. Also, a current limit can save system costs by reducing PCB traces, connector size, and the capacity of the preceding power stage.

Current limit offers protection from over-stressing to the load and integrated power FET. Current limit holds the current at the set value, and asserts the FLT1 pin as diagnostic reports. The pin is asserted when the current rises to the ICL_FLT1_RISING level.

The current-limit threshold can be set by either connecting a resistor from the ILIM pin to ground, or by floating the ILIM pin or by shorting the ILIM pin to ground.

  • External programmable current limit: An external resistor, RILIM, is used to set the current limit. This value can be dynamically changed by changing the resistance. This information can be seen in the Applications section.
  • Internal current limit: If the ILIM pin is shorted to ground or kept open, or the RILIM resistor is out of range (< 6.75kΩ or > 67.5kΩ), the internal current limit is fixed and typically 2.1A.

Current limit is active when VBB is powered and EN or EN_AUX is high. Note that if a GND network is used (which leads to the level shift between the device GND and board GND), the ILIM pin must be connected with device GND. Calculate RLIM with Equation 2.

Equation 7. RLIM (kΩ) ≈ 13.5 / ILIM (A)

For more information about the current limiting feature, see the Short-Circuit and Overload Protection section.