TPS3851-Q1 Automotive High-Accuracy Voltage Supervisor With Integrated Watchdog Timer | TI.com

TPS3851-Q1 (ACTIVE) Automotive High-Accuracy Voltage Supervisor With Integrated Watchdog Timer

 

Recommended alternative parts

  • TPS3851  -  Catalog version of this device
  • TPS3828-Q1  -  Similar functionality in a smaller SOT-23 package
  • TPS3431-Q1  -  Automotive standalone watchdog timer with no built-in voltage monitoring feature

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.

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

All trademarks are the property of their respective owners.

Parametrics

Compare all products in Supervisor & reset ICs Email Download to Excel
Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) Watchdog timer WDI (sec)
TPS3851-Q1 Order now 1.67
1.73
2.32
2.4
2.79
2.88
3.07
3.17
4.65
4.8    
1     6.5     1.6     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog disable
Watchdog timer
Functional safety    
Automotive     -40 to 125     Programmable