SLVSH18B December   2024  – July 2025 TPS4HC120-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 Timing Characteristics, SNS
    7. 6.7 Switching Characteristics
    8. 6.8 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 Pin Current and Voltage Conventions
      2. 7.3.2 Low Power Mode
        1. 7.3.2.1 Entry into LPM
        2. 7.3.2.2 During LPM
        3. 7.3.2.3 Exiting LPM
      3. 7.3.3 Accurate Current Sense
      4. 7.3.4 Adjustable Current Limit
      5. 7.3.5 Inductive-Load Switching-Off Clamp
      6. 7.3.6 Fault Detection and Reporting
        1. 7.3.6.1 Diagnostic Enable Function
        2. 7.3.6.2 Multiplexing of Current Sense
        3. 7.3.6.3 FAULT Reporting
        4. 7.3.6.4 Fault Table
      7. 7.3.7 Full Diagnostics
        1. 7.3.7.1 Short-to-GND and Overload Detection
        2. 7.3.7.2 Open-Load Detection
          1. 7.3.7.2.1 Channel On
          2. 7.3.7.2.2 Channel Off
        3. 7.3.7.3 Short-to-Battery Detection
        4. 7.3.7.4 Reverse-Polarity and Battery Protection
        5. 7.3.7.5 Thermal Fault Detection
          1. 7.3.7.5.1 Thermal Protection Behavior
      8. 7.3.8 Full Protections
        1. 7.3.8.1 UVLO Protection
        2. 7.3.8.2 Loss of GND Protection
        3. 7.3.8.3 Loss of Power Supply Protection
        4. 7.3.8.4 Reverse Polarity Protection
        5. 7.3.8.5 Protection for MCU I/Os
    4. 7.4 Device Functional Modes
      1. 7.4.1 Working Modes
        1. 7.4.1.1 SLEEP
        2. 7.4.1.2 DIAGNOSTIC
        3. 7.4.1.3 ACTIVE
        4. 7.4.1.4 STANDBY DELAY
        5. 7.4.1.5 LOW POWER MODE
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 EMC Transient Disturbances Test
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      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 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.6.2 Multiplexing of Current Sense

SELx pins are used to multiplex the shared current-sense function among the four channels within the same device. Pulling each pin high or low sets the corresponding channel to be output on the SNS pin if DIAG_EN is high. FLT still represents a global interrupt that goes low if a fault occurs on any channel.

If current sense information is multiplexed across different devices, do not directly tie the SNS pins together across multiple devices. When the DIAG_EN is LOW, there is an internal clamp at SNS pin that clamps the voltage to approximately 2V. One device SNS pin is able to affect the SNS readback of other devices if tied directly.

To use the SNS pin across multiple devices, connect individual SNS pin to different analog input pins of MCU; see Figure 7-13. Alternatively, use an external analog MUX to connect to a single MCU pin; see Figure 7-14.

TPS4HC120-Q1 SNS Sharing Across Multiple Devices Method 1Figure 7-13 SNS Sharing Across Multiple Devices Method 1
TPS4HC120-Q1 SNS Sharing Across Multiple Devices Method 2Figure 7-14 SNS Sharing Across Multiple Devices Method 2
Table 7-2 Diagnosis Configuration Table
DIAG_ENENxSEL0SEL1SNS ACTIVATED CHANNELSNS FLTPROTECTIONS AND DIAGNOSTICS
LH———0V. Clamp to 2V internally if external voltage is applied to the pin.See Table 7-3SNS disabled, FLT reporting, full protection
LHigh-ZDiagnostics disabled, no protection
H—00Channel 1See Table 7-3See Table 7-3See Table 7-3
01Channel 2
10Channel 3
11Channel 4