TPS7B63-Q1 TPS7B63-Q1 300-mA 40-V High-Voltage Ultralow-Quiescent-Current Watchdog LDO |


TPS7B63-Q1 300-mA 40-V High-Voltage Ultralow-Quiescent-Current Watchdog LDO

TPS7B63-Q1 300-mA 40-V High-Voltage Ultralow-Quiescent-Current Watchdog LDO - TPS7B63-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 TPS7B63xx-Q1 device is a family of 300-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 watchdog or standard watchdog, with an external resistor to set the watchdog time within 9% accuracy.

The PG pin on the TPS7B63xx-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 selecting external components. The devices also feature integrated short-circuit and overcurrent protection. The combination of such features makes these devices particularly flexible and suitable to supply microcontroller 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: 300 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: 400 mV at 300 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
  • 16-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)
TPS7B63-Q1 TPS7A63-Q1 TPS7A6401-Q1 TPS7B68-Q1
0.3     0.3     0.3     0.5    
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    
300     300     300     150    
2     2     2     2    
55     40     40     50    
Ceramic     Ceramic     Ceramic    
Automotive     Automotive     Automotive     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 125