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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 VCC (Max) (V) 6.5 Rating Catalog VCC (Min) (V) 1.6 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

  • 0.8% Voltage Threshold Accuracy
  • Precision Undervoltage Monitoring:
    • Supports Common Rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage Thresholds Available
    • 0.5% Hysteresis
  • Factory-Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • Low Quiescent Current: IDD = 10 µA (typ)
  • Open-Drain Outputs
  • 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
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Description

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. 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.

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

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Exact equivalent in functionality and parametrics to the compared device:
TPS3851-Q1 ACTIVE Automotive, high-accuracy voltage supervisor with Integrated watchdog timer AEC-Q100 qualified version of this device
Similar but not functionally equivalent to the compared device:
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
TPS3431 ACTIVE Standard programmable watchdog timer with enable A standalone watchdog timer with no built-in voltage monitoring feature

Technical documentation

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Type Title Date
* Datasheet TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer datasheet Nov. 16, 2016
Selection guides Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb. 28, 2020
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) Oct. 09, 2018
Technical articles Exploring watchdog timer applications Feb. 02, 2017
Technical articles What is a watchdog timer and why is it important? Jan. 10, 2017
User guides TPS3851EVM-780 Evaluation Module Nov. 17, 2016
Technical articles A New Understanding: Blast Motion redefines movement, tracking and training for athletes. Aug. 06, 2014
Technical articles Improving Fly-Buck Regulation Using Opto (Part-1) Jul. 15, 2014

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$29.00
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 MODELS Download
SBVM650A.ZIP (66 KB) - PSpice Model
SIMULATION MODELS Download
SBVM651A.ZIP (6 KB) - PSpice Model
SIMULATION MODELS Download
SBVM652A.ZIP (66 KB) - PSpice Model
SIMULATION MODELS Download
SBVM653A.ZIP (7 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
SON (DRB) 8 View options

Ordering & quality

Support & training

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