SBVS300A November   2016  – September 2021 TPS3851

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Timing Diagrams
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 RESET
      2. 7.3.2 Manual Reset MR
      3. 7.3.3 UV Fault Detection
      4. 7.3.4 Watchdog Mode
        1. 7.3.4.1 CWD
        2. 7.3.4.2 Watchdog Input WDI
        3. 7.3.4.3 Watchdog Output WDO
        4. 7.3.4.4 SET1
    4. 7.4 Device Functional Modes
      1. 7.4.1 VDD is Below VPOR ( VDD < VPOR)
      2. 7.4.2 Above Power-On-Reset, But Less Than VDD(min) (VPOR ≤ VDD < VDD(min))
      3. 7.4.3 Normal Operation (VDD ≥ VDD(min))
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 CWD Functionality
        1. 8.1.1.1 Factory-Programmed Timing Options
        2. 8.1.1.2 Adjustable Capacitor Timing
      2. 8.1.2 Overdrive Voltage
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Monitoring the 1.8-V Rail
        2. 8.2.2.2 Calculating RESET and WDO Pullup Resistor
        3. 8.2.2.3 Setting the Watchdog
        4. 8.2.2.4 Watchdog Disabled During Initialization Period
      3. 8.2.3 Glitch Immunity
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

at VITN + VHYST ≤ VDD ≤ 6.5 V over the operating temperature range of –40°C ≤ TA, T A ≤ 125°C (unless otherwise noted); the open-drain pullup resistors are 10 kΩ for each output; typical values are at TA = 25°C
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
GENERAL CHARACTERISTICS
VDD(1)(2)(3)Supply voltage1.66.5V
IDDSupply current 1019µA
RESET FUNCTION
VPOR(2)Power-on reset voltageIRESET = 15 µA, VOL(MAX) = 0.25 V 0.8V
VUVLO(1)Undervoltage lockout voltage1.35V
VITNUndervoltage threshold accuracy, entering RESETVDD fallingVITN – 0.8%VITN + 0.8%
VHYSTHysteresis voltageVDD rising0.2%0.5%0.8%
IMRMR pin internal pullup currentVMR = 0 V500620700nA
WATCHDOG FUNCTION
ICWDCWD pin charge currentCWD = 0.5 V 347 375403nA
VCWDCWD pin threshold voltage1.1961.211.224 V
VOLRESET, WDO output lowVDD = 5 V, ISINK = 3 mA0.4V
IDRESET, WDO output leakage current, open-drainVDD = VITN + VHYST,
VRESET = VWDO = 6.5 V		1µA
VILLow-level input voltage ( MR, SET1)0.25V
VIHHigh-level input voltage ( MR, SET1)0.8V
VIL(WDI)Low-level input voltage (WDI)0.3 × VDDV
VIH(WDI)High-level input voltage (WDI)0.8 × VDDV
(1) When VDD falls below VUVLO, RESET is driven low.
(2) When VDD falls below VPOR, RESET and WDO are undefined.
(3) During power-on, VDD must be a minimum 1.6 V for at least 300 µs before RESET correlates with VDD.