SNVSB03E December   2018  – May 2026 TPS3840

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  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 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 Input Voltage (VDD)
        1. 7.3.1.1 VDD Hysteresis
        2. 7.3.1.2 VDD Transient Immunity
      2. 7.3.2 User-Programmable Reset Time Delay
      3. 7.3.3 Manual Reset (MR) Input
      4. 7.3.4 Output Logic
        1. 7.3.4.1 RESET Output, Active-Low
        2. 7.3.4.2 RESET Output, Active-High
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation (VDD > VDD(min))
      2. 7.4.2 VDD Between VPOR and VDD(min)
      3. 7.4.3 Below Power-On-Reset (VDD < VPOR)
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design 1: Dual Rail Monitoring with Power-Up Sequencing
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2: Battery Voltage and Temperature Monitor
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
      3. 8.2.3 Design 3: Fast Start Undervoltage Supervisor with Level-shifted Input
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
      4. 8.2.4 Design 4: Voltage Monitor with Back-up Battery Switchover
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
      5. 8.2.5 Application Curve: TPS3840EVM
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Nomenclature
    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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.2.1 Design Requirements

This design requires voltage and temperature supervision on a battery voltage rail and the requirements can differ depending on if undervoltage or overvoltage monitoring is required. For this design, both requirements are considered to show the flexibility of the TPS3840 device. The first application example shown in Figure 8-3 uses TPS3840DL30, an open-drain active-low voltage supervisor to monitoring undervoltage and TMP303, a push-pull active-high window temperature switch to monitor under and over temperature. For the undervoltage application, the TPS3840DL30 is operating in the inactive logic high region so an overvoltage fault occurs when the battery voltage falls below VIT- = 3.0V or when the battery temperature is outside the range from 0°C to 60°C. The second application example uses TPS3840DL30 operating in the active-low region to monitor overvoltage and TMP303 to monitor under and over temperature. For the overvoltage requirement, the fault occurs when the battery voltage rises above 3.1V or when the battery temperature is outside the range from 0°C to 60°C.

PARAMETERDESIGN REQUIREMENTDESIGN RESULT
Battery Voltage SupervisionMonitor 3.3V battery for undervoltage conditionTPS3840 provides voltage monitoring with 1% accuracy with device options available in 0.1V variations. TPS3840DL30 triggers a reset when VDD falls below 3V. TPS3840PH30 triggers a reset when VDD rises above 3V plus hysteresis setting the overvoltage threshold to 3.1V.
Monitor 2.8V battery for overvoltage condition
Battery Temperature SupervisionMonitor battery temperature between 0°C and 60°C with 1°C resolution for undervoltage designTMP303A monitors temperature within 0°C to 60°C with 1°C resolution. Note this is a push-pull, active-high output device.
Output TopologyUndervoltage: Active-Low, Open-DrainTPS3840 is offered in Active-Low Open-drain, Active-Low Push-Pull, and Active-High Push-Pull topologies
Overvoltage: Active-High, Push-Pull
Maximum device current consumption10µATPS3840 requires 350nA (typical) and TMP303 requires 3.5µA (typical)
Delay when returning from fault conditionDelay of at least 6 seconds when returning from the fault to prevent operation in fault conditionsCCT = 10µF sets 6.18 second delay