TPS3850 Precision window supervisor for OV & UV monitoring with window watchdog timer & programmable delay | TI.com

TPS3850 (ACTIVE) Precision window supervisor for OV & UV monitoring with window watchdog timer & programmable delay

 

Recommended alternative parts

  • TPS3850-Q1  -  AEC-Q100 qualified version of this device for automotive applications
  • TPS3430  -  A standalone window watchdog timer to sense both early and late faults
  • TPS3431  -  A standalone watchdog timer with no built-in voltage monitoring feature
  • TPS3700  -  Wide VIN up to 18-V, window supervisor without watchdog timer feature

Description

The TPS3850 combines a precision voltage supervisor with a programmable window watchdog timer. The TPS3850 window comparator achieves 0.8% accuracy (–40°C to +125°C) for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds. The TPS3850 also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factory-programmed RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3850 includes a programmable window 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 window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3850 is available in a small 3.00-mm × 3.00-mm, 10-pin VSON package.

Features

  • 0.8% Voltage Threshold Accuracy
  • Precision Over- and Undervoltage Monitoring:
    • Supports Common Rails from 0.9 V to 5.0 V
    • ±4% and ±7% Fault Windows Available
    • 0.5% Hysteresis
  • Factory-Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • User-Programmable Reset Delay
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • Low Supply Current: IDD = 10 µA (typ)
  • Open-Drain Outputs
  • Available in a Small 3-mm × 3-mm, 10-Pin VSON Package
  • Junction Operating Temperature Range:
    –40°C to +125°C

Parametrics

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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)
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    
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    
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    
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