High-Accuracy Voltage Supervisor With Integrated Watchdog Timer - TPS3851

TPS3851 (ACTIVE)

High-Accuracy Voltage Supervisor With Integrated Watchdog Timer

 

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.

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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Parametrics Compare all products in Supervisor and Reset IC

 
Threshold Voltage 1 (Typ) (V)
# 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 TPS3850 TPS3852
1.67
1.73
2.32
2.4
2.79
2.88
3.07
3.17
4.65
4.8   
Adjustable
1.11
1.15
1.67
1.72
2.79
2.88
3.06
3.16
4.65
4.8   
3.07
3.17   
1    1    1   
6.5    6.5    6.5   
1.6    1.6    1.6   
Active-low
Open-drain   
Active-low
Open-drain   
Active-low
Open-drain   
200    Programmable    200   
Active Low Enable
Manual Reset
Watchdog Disable
Watchdog Timer   
Over Voltage Sense
Watchdog Disable
Watchdog Timer
Window Comparator
Window Watchdog   
Active Low Enable
Manual Reset
Watchdog Disable
Watchdog Timer
Window Watchdog   
Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125   
Programmable    Programmable    Programmable   

Other qualified versions of TPS3851

Version Part Number Definition
Automotive TPS3851-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects