SNVSB03D December   2018  – January 2020 TPS3840


  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Typical Application Circuit
      2.      TPS3840 Typical Supply Current
  4. Revision History
  5. Device Comparison
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Voltage (VDD)
        1. VDD Hysteresis
        2. VDD Transient Immunity
      2. 8.3.2 User-Programmable Reset Time Delay
      3. 8.3.3 Manual Reset (MR) Input
      4. 8.3.4 Output Logic
        1. RESET Output, Active-Low
        2. RESET Output, Active-High
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation (VDD > VDD(min))
      2. 8.4.2 VDD Between VPOR and VDD(min)
      3. 8.4.3 Below Power-On-Reset (VDD < VPOR)
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design 1: Dual Rail Monitoring with Power-Up Sequencing
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curves
      2. 9.2.2 Design 2: Battery Voltage and Temperature Monitor
        1. Design Requirements
        2. Detailed Design Procedure
      3. 9.2.3 Design 3: Fast Start Undervoltage Supervisor with Level-shifted Input
        1. Design Requirements
        2. Detailed Design Procedure
      4. 9.2.4 Design 4: Voltage Monitor with Back-up Battery Switchover
        1. Design Requirements
        2. Detailed Design Procedure
      5. 9.2.5 Application Curve: TPS3840EVM
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Nomenclature
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Design Requirements

This design requires voltage and temperature supervision on a battery voltage rail and the requirements may 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 50 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- = 3.0 V 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 3.1 V or when the battery temperature is outside the range from 0°C to 60°C.

Battery Voltage Supervision Monitor 3.3-V battery for undervoltage condition TPS3840 provides voltage monitoring with 1% accuracy with device options available in 0.1 V variations. TPS3840DL30 triggers a reset when VDD falls below 3 V. TPS3840PH30 triggers a reset when VDD rises above 3 V plus hysteresis setting the overvoltage threshold to 3.1 V.
Monitor 2.8-V battery for overvoltage condition
Battery Temperature Supervision Monitor battery temperature between 0°C and 60°C with 1°C resolution for undervoltage design TMP303A monitors temperature within 0°C to 60°C with 1°C resolution. Note this is a push-pull, active-high output device.
Output Topology Undervoltage: Active-Low, Open-Drain TPS3840 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 consumption 10 µA TPS3840 requires 350 nA (typical) and TMP303 requires 3.5 µA (typical)
Delay when returning from fault condition Delay of at least 6 seconds when returning from the fault to prevent operation in fault conditions CCT = 10 µF sets 6.18 second delay