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Product details

Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 1.67, 1.73, 2.32, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Active-low enable, Manual reset, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 TI functional safety category Functional Safety-Capable Rating Automotive Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

VSON (DRB) 8 9 mm² 3 x 3 open-in-new Find other Supervisor & reset ICs

Features

  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • 1% Voltage Threshold Accuracy
  • Low Supply Current: IDD = 10 µA (typ)
  • User-Programmable Watchdog Timeout
  • Factory Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Open-Drain Outputs
  • Precision Undervoltage Monitoring:
    • Supports Common Rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage Thresholds Available
    • 0.5% Hysteresis
  • Watchdog Disable Feature
  • Available in a Small 3-mm × 3-mm, 8-Pin VSON Package

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Description

The TPS3851-Q1 device combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851-Q1 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold. The TPS3851-Q1 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851-Q1 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3851-Q1 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package. The TPS3851-Q1 features wettable flanks that allow for easy optical inspection.

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Similar but not functionally equivalent to the compared device:
TPS3431-Q1 ACTIVE Automotive, standard programmable watchdog timer with enable Automotive standalone watchdog timer with no built-in voltage monitoring feature
TPS3828-Q1 ACTIVE Automotive voltage monitor with watchdog timer Similar functionality in a smaller SOT-23 package

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet TPS3851-Q1 High-Accuracy Voltage Supervisor with Integrated Watchdog Timer datasheet Mar. 30, 2017
Functional safety information TPS3851-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec. 19, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
29
Description
The TPS3851EVM-780 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS3851 low-quiescent current, 0.8% accuracy supervisor with integrated window watchdog timer. The EVM circuit board is configured to be a reference design for (...)
Features
  • High threshold accuracy: 0.8%
  • Low IQ: 10 µA (typical)
  • Manual reset (MR) input
  • Open-drain RESET output
  • User-programmable watchdog timer

Design tools & simulation

SIMULATION MODEL Download
SBVM650A.ZIP (66 KB) - PSpice Model
SIMULATION MODEL Download
SBVM651A.ZIP (6 KB) - PSpice Model
SIMULATION MODEL Download
SBVM652A.ZIP (66 KB) - PSpice Model
SIMULATION MODEL Download
SBVM653A.ZIP (7 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Efficient, low-heat, CISPR 25 class 5-compliant power reference design for infotainment display
PMP22030 — This reference design is focused on the power tree for an automotive infotainment display unit covering various power supply rails including two off-battery converters providing 5.0-V and 3.3-V, and intermediary system rails of 1.8-V and 1.1-V. The test results demonstrate high efficiency, low heat (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SON (DRB) 8 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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