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

TPS3851
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
High-Accuracy Voltage Supervisor With Integrated Watchdog Timer

 

Recommended alternative parts

  • TPS3851-Q1  -  AEC-Q100 qualified version of this device for automotive applications
  • TPS3828  -  Similar functionality in a smaller SOT-23 package
  • TPS3123  -  Fixed watchdog and reset time delay in a smaller SOT-23 package with push-pull output
  • TPS3431  -  A standalone watchdog timer with no built-in voltage monitoring feature

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

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 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
Safety documentation    
Catalog     -40 to 125     Programmable    
TPS3813 Order now 2.25
2.64
2.93
4.55    
1     6     2     Active-low
Open-drain    
25     Watchdog timer     Catalog     -40 to 85     Programmable    
TPS3828 Order now 2.93
4.55    
1     5.5     1.1     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog timer
Safety documentation    
Catalog     -40 to 85     1.6    
TPS3850 Order now Adjustable
1.11
1.15
1.67
1.72
2.79
2.88
3.06
3.16
4.65
4.8    
1     6.5     1.6     Active-low
Open-drain    
Programmable     Undervoltage and overvoltage monitor
Watchdog disable
Watchdog timer
Window watchdog
Safety documentation    
Catalog     -40 to 125     Programmable    
TPS3852 Order now 3.07
3.17    
1     6.5     1.6     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog disable
Watchdog timer
Window watchdog
Safety documentation    
Catalog     -40 to 125     Programmable