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TPS3851

ACTIVE

High-accuracy voltage supervisor with Integrated watchdog timer

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Data sheet

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Same functionality with different pin-out to the compared device
TPS35-Q1 ACTIVE Automotive nano-quiescent-current precision supervisor with timeout watchdog timer 250-nA IQ, enhanced watchdog accuracy, compact packaging, and on-the-fly programming

TPS3851

ACTIVE
Data sheet Order now

Product details

Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.674, 1.728, 2.325, 2.4, 2.79, 2.88, 3.069, 3.168, 4.65, 4.8 Features Manual reset capable, Timeout watchdog, Undervoltage monitor only, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Supply voltage (min) (V) 1.6 Supply voltage (max) (V) 6.5 Rating Catalog Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 125
Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.674, 1.728, 2.325, 2.4, 2.79, 2.88, 3.069, 3.168, 4.65, 4.8 Features Manual reset capable, Timeout watchdog, Undervoltage monitor only, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Supply voltage (min) (V) 1.6 Supply voltage (max) (V) 6.5 Rating Catalog Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 125
VSON (DRB) 8 9 mm² 3 x 3
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • 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
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3-mm × 3-mm, 8-Pin VSON package
  • Junction operating temperature range: –40°C to +125°C
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • 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
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3-mm × 3-mm, 8-Pin VSON package
  • Junction operating temperature range: –40°C to +125°C

The TPS3851 combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851 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 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.

TPS3851 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package.

The TPS3851 combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851 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 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.

TPS3851 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package.
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TPS3851-Q1 ACTIVE Automotive, high-accuracy voltage supervisor with Integrated watchdog timer AEC-Q100 qualified version of this device
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TPS3123 ACTIVE Active-low, push-pull, supply voltage supervisor with watchdog timer & manual reset Fixed watchdog and reset time delay in a smaller SOT-23 package with push-pull output
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Technical documentation

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Type Title Date
* Data sheet TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer datasheet (Rev. A) PDF | HTML 20 May 2021
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) 17 Mar 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) 28 Feb 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Technical article Exploring watchdog timer applications PDF | HTML 02 Feb 2017
Technical article What is a watchdog timer and why is it important? PDF | HTML 11 Jan 2017

Design & development

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Evaluation board

TPS3851EVM-780 — TPS3851 high-accuracy supervisor with window watchdog evaluation module

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 (...)
User guide: PDF
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Simulation model

TPS3851XyyE PSpice Transient Model (Rev. A)

SBVM652A.ZIP (66 KB) - PSpice Model
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Simulation model

TPS3851XyyE Unencrypted PSpice Transient Model (Rev. A)

SBVM653A.ZIP (7 KB) - PSpice Model
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Simulation model

TPS3851XyyS PSpice Transient Model (Rev. A)

SBVM650A.ZIP (66 KB) - PSpice Model
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Simulation model

TPS3851XyyS Unencrypted PSpice Transient Model (Rev. A)

SBVM651A.ZIP (6 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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