SNVSCP5C April   2025  – August 2026 TPS7H3024-SP , TPS7H3034-SP , TPS7H3124-SP , TPS7H3134-SP

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 Requirements
    7. 6.7 Quality Conformance Inspection
    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 Input Voltage (IN), VLDO, and REFCAP
        1. 8.3.1.1 Undervoltage Lockout (VPOR_IN < VIN < UVLO)
        2. 8.3.1.2 Power-On Reset (VIN < VPOR_IN)
      2. 8.3.2 SR_UVLO
      3. 8.3.3 SENSEx Inputs
        1. 8.3.3.1 VTH_SENSEX and VOUTx_RISE
        2. 8.3.3.2 IHYS_SENSEx and VOUTx_FALL
        3. 8.3.3.3 Input to Output Time Diagrams
        4. 8.3.3.4 Top and Bottom Resistive Divider Design Equations
      4. 8.3.4 MODE
      5. 8.3.5 Output Stages (RESETx, PWRGD, WDO, PULL_UP1, and PULL_UP2)
        1. 8.3.5.1 Push-Pull Outputs
        2. 8.3.5.2 Open-Drain Outputs (TPS7H3124 and TPS7H3134)
      6. 8.3.6 WDI
      7. 8.3.7 User-Programmable TIMERS
        1. 8.3.7.1 DLY_TMR
        2. 8.3.7.2 WD_TMR
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Window Voltage Monitoring
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Input Power Supplies and Decoupling Capacitors
          2. 9.2.1.2.2 SR_UVLO Threshold
          3. 9.2.1.2.3 SENSEx Thresholds
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Supervision of Negative Voltage Rails
        1. 9.2.2.1 Negative Voltage Monitoring Example
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 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

8.3.3.1 VTH_SENSEX and VOUTx_RISE

The TPS7H3024 voltage supervisor integrates four input comparators, with an accurate (±1%) threshold voltage of 599.7mV (VTH_SENSEx) typical. VTH_SENSEx is measured at the RESETx outputs to account for comparator offsets in the threshold. Maximum flexibility is provided as external resistive dividers can be adjusted to sense a desired voltage rail (VOUTx). Figure 8-5 shows a conceptual diagram of the comparators connected to the SENSEx inputs. As can be observed, the sensed voltage rail (VOUTx) is attenuated (using an external resistive divider, RTOPx and RBOTTOMx) and compared against the VTH_SENSEx voltage. Is recommended to maintain the steady-state SENSEx voltage below 1.6V, to maintain good threshold (VTH_SENSEx) accuracy over lifetime.

TPS7H3024-SP TPS7H3034-SP TPS7H3124-SP TPS7H3134-SP SENSEx Comparators Inputs
Note: The comparator by itself does not have a built-in voltage hysteresis. The hysteresis is controlled externally using the hysteresis current (IHYS_SENSEx) and the top resistor (RTOPx). For more details, refer to Section 8.3.3.4. The input comparator does not change for the undervoltage or overvoltage type. The overvoltage is implemented by inverting the signal that drives the output stage.
Figure 8-5 SENSEx Comparators Inputs
When the voltage at the monitored rail (VOUTx) is rising, the hysteresis current (IHYS_SENSEx) is not connected to the SENSEx input. The SENSEx (attenuated VOUTx) voltage is compared to the internal reference (VTH_SENSEx). When VSENSEx > VTH_SENSEx the voltage is considered as:
  1. In regulation: for an undervoltage channel (UV).
  2. Not in regulation: for an overvoltage channel (OV)

Calculate the rising voltage threshold voltage on VOUTx by doing a simple voltage divider as:

Equation 9. V OUTx _ R I S E _ N O M I N A L ( V ) = 1 + R T O P x R B O T T O M x × V T H _ S E N S E x

Where:

  • VTH_SENSEx is the typical sense threshold voltage of 599.7mV.
    • If it is desired to minimize the error on the monitored voltage across temperature, the centered value can be used instead of the typical as:
    Equation 10. V TH_SENSEx =   V TH_SENSEx M I N + V TH_SENSEx M A X 2 = 599 m V
  • RTOPx is the top resistor in Ω.
  • RBOTTOMx is the bottom resistor in Ω.

As with any system, there is some variation (or errors) of the design variables, in this case the top resistor, bottom resistors and the SENSEx threshold voltage (VTH_SENSEx). Using the derivative method to calculate the total error (with the assumption that all variables are uncorrelated and both resistors have the same tolerance value), the VTH_RISEx_NOMINAL error can be calculated as:

Equation 11. V OUTx _ RISE _ E R R O R ( V ) = ± V T H _ S E N S E x 2 × 2 × R T O L 2 × R T O P x 2 + V T H _ S E N S E x _ A C C 2 × R T O P x + R B O T T O M x 2 R B O T T O M x 2

Where:

  • RTOL is the resistors tolerance (same for top and bottom resistors) as numeric value. For example, for 0.1% tolerance resistors, we use 0.001.
  • VTH_SENSEx_ACC is the SENSEx threshold accuracy as numeric value (in this case 0.01).
  • RTOPx and RBOTTOMx are in Ω.
  • VTH_SENSEx is 0.599 Volts (center across temperature).

Using Equation 9 and Equation 11, calculate the rising voltage threshold range as:

Equation 12. V OUTx_RISE = V OUTx_RISE _ N O M I N A L   ±   V OUTx_RISE _ E R R O R

Note: Remember VTH_SENSEx is the reference voltage when accounting for the comparator offsets VTH_SENSEx = VREF + VIOx.

Although it is not required, in noisy applications it is good analog design practice to place a small bypass capacitor at the SENSEx inputs to reduce sensitivity to transient voltages on the monitored signal.