SLVSE16E May   2019  – September 2026 TPS1HB08-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
    1. 5.1 Recommended Connections for Unused Pins
  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 SNS Timing Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Protection Mechanisms
        1. 8.3.1.1 Thermal Shutdown
        2. 8.3.1.2 Current Limit
          1. 8.3.1.2.1 Current Limit Foldback
          2. 8.3.1.2.2 Programmable Current Limit
          3. 8.3.1.2.3 Undervoltage Lockout (UVLO)
          4. 8.3.1.2.4 VBB During Short-to-Ground
        3. 8.3.1.3 Voltage Transients
          1. 8.3.1.3.1 Load Dump
          2. 8.3.1.3.2 Driving Inductive Loads
        4. 8.3.1.4 Reverse Battery
        5. 8.3.1.5 Fault Event – Timing Diagrams - Version A and B
        6. 8.3.1.6 Fault Event – Timing Diagrams - Version F
      2. 8.3.2 Diagnostic Mechanisms
        1. 8.3.2.1 VOUT Short-to-Battery and Open-Load
          1. 8.3.2.1.1 Detection With Switch Enabled
          2. 8.3.2.1.2 Detection With Switch Disabled
        2. 8.3.2.2 SNS Output
          1. 8.3.2.2.1 RSNS Value
            1. 8.3.2.2.1.1 High Accuracy Load Current Sense
            2. 8.3.2.2.1.2 SNS Output Filter
        3. 8.3.2.3 Fault Indication and SNS Mux
        4. 8.3.2.4 Resistor Sharing
        5. 8.3.2.5 High-Frequency, Low Duty-Cycle Current Sensing
    4. 8.4 Device Functional Modes
      1. 8.4.1 Off
      2. 8.4.2 Standby
      3. 8.4.3 Diagnostic
      4. 8.4.4 Standby Delay
      5. 8.4.5 Active
      6. 8.4.6 Fault
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Ground Protection Network
      2. 9.1.2 Interface With Microcontroller
      3. 9.1.3 I/O Protection
      4. 9.1.4 Inverse Current
      5. 9.1.5 Loss of GND
      6. 9.1.6 Automotive Standards
        1. 9.1.6.1 ISO7637-2
        2. 9.1.6.2 TPS1HB08-Q1 AEC-Q100-012 Short-Circuit Reliability
      7. 9.1.7 Interference on Device Pins
      8. 9.1.8 Thermal Information
    2. 9.2 Typical Application: Resistive Heater Loads
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Thermal Considerations
        2. 9.2.2.2 RILIM Calculation
        3. 9.2.2.3 Diagnostics
          1. 9.2.2.3.1 Selecting the RISNS Value
    3. 9.3 Typical Application: Headlight Bulb Loads
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
      3. 9.3.3 Application Curves
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

8.3.2.3 Fault Indication and SNS Mux

The following faults are communicated through the SNS output:

  • Switch shutdown, due to:
    • Thermal shutdown
    • Current limit
  • Open-Load and VOUT shorted-to-battery

Open-load and Short-to-battery are not indicated while the switch is enabled, although these conditions can still be detected through the sense current. Hence, if there is a fault indication while the channel is enabled, then it must be either due to an overcurrent or overtemperature event.

The SNS pin will only indicate the fault if the SEL1 pins is low. When the SEL1 pin is high and the device is set to measure temperature, the pin is measuring the channel FET temperature.

For device version F, the FLT pin pulls low when the device is in any of these fault states.

Table 8-2 Device Version A/B SNS Mux
INPUTSOUTPUTS
DIA_ENSEL1FAULT DETECT(1)SNS
0XXHigh-z
100Output current
110Device temperature
101ISNSFH
111Device temperature
(1) Fault Detect encompasses multiple conditions:
  • Switch shutdown and waiting for retry
  • Open Load and Short To Battery

For device version F, the SEL1 pin has no functionality so the device cannot output a temperature sense current. In this case, SEL1 must be connected to ground through an RPROT resistor and the SNS behavior follows the table below.

Table 8-3 Device Version F SNS Mux
INPUTS OUTPUTS
DIA_EN SEL1 FAULT DETECT(1) SNS FLT(2)
0 X X High-z High-z
1 X 0 Output current High-z
1 X 1 ISNSFH Open-drain
(1) Fault Detect encompasses multiple conditions:
  • Switch shutdown and waiting for retry
  • Open Load / Short To Battery
(2) Version F Only