TPS7B68-Q1 TPS7B68-Q1 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO |


TPS7B68-Q1 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO

TPS7B68-Q1 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO - TPS7B68-Q1


In automotive microcontroller or microprocessor power-supply applications, the watchdog is used to monitor the microcontroller working status to prevent software runaway. It is necessary for the watchdog to be independent of the microcontroller in a reliable system.

The TPS7B68xx-Q1 device is a family of 500-mA watchdog LDOs designed for an operating voltage up to 40 V, with typical quiescent current of only 19 µA at light load. The devices integrate a programmable function for selecting a window or standard watchdog, with an external resistor to set the watchdog time within 9% accuracy.

The PG pin on the TPS7B68xx-Q1 devices indicate when the output voltage is stable and in regulation. The power-good delay period and power-good threshold can be adjusted by external components. The devices also feature an integrated short-circuit and overcurrent protection. The combination of such features makes these devices particularly flexible and suitable to supply microcontroller systems in automotive applications.


  • Qualified for Automotive Applications
  • 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
  • Maximum Output Current: 500 mA
  • 4-V to 40-V Wide VIN Input-Voltage Range With Up to 45-V Transients
  • Fixed 3.3-V and 5-V Outputs
  • Maximum Dropout Voltage: 600 mV at 500 mA
  • Stable With Output Capacitor in Wide-Range of Capacitance (4.7 µF to 500 µF) and ESR (0.001 Ω to 20 Ω)
  • Low Quiescent Current (I(Q))
    • < 4 µA When EN Is Low (Shutdown Mode)
    • 19 µA Typical at Light Loads With WD_EN High (Watchdog Disabled)
  • Configurable for Window Watchdog or Standard Watchdog
  • Open-to-Closed Window Ratio Configurable as 1:1 or 8:1
  • Fully Adjustable Watchdog Period (From 10 ms to 500 ms)
  • 9% Accurate Watchdog Period
  • Dedicated WD_EN Pin to Control Watchdog ON-OFF
  • Fully Adjustable Power-Good Threshold and Power-Good Delay Period
  • Low Input-Voltage Tracking to UVLO
  • Integrated Fault Protection
    • Overload Current-Limit Protection
    • Thermal Shutdown
  • 28-Pin HTSSOP Package

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Parametrics Compare all products in Single Channel LDO

Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Fixed Output Options (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
PSRR @ 100KHz (dB)
Output Capacitor Type
Operating Temperature Range (C)
TPS7B68-Q1 TPS7A63-Q1 TPS7A6401-Q1 TPS7B63-Q1
0.5     0.3     0.3     0.3    
Fixed Output     Adjustable Output
Fixed Output    
Adjustable Output     Fixed Output    
4     11     11     4    
40     40     40     40    
3.3     2.5     2.5     3.3    
5     7     7     5    
0.019     0.035     0.035     0.019    
150     300     300     300    
2     2     2     2    
50     40     40     55    
Ceramic     Ceramic     Ceramic     Ceramic
Automotive     Automotive     Automotive     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 125