TPS7B63-Q1 Automotive 300mA 40V High-Voltage Ultra-Low-Quiescent-Current Watchdog LDO |


Automotive 300mA 40V High-Voltage Ultra-Low-Quiescent-Current Watchdog LDO



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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Output Options
Iout (Max) (A)
Vin (Max) (V)
Vin (Min) (V)
Vout (Max) (V)
Vout (Min) (V)
Fixed Output Options (V)
Package Group
Regulated Outputs (#)
Operating Temperature Range (C)
Thermal Resistance θJA (°C/W)
Approx. Price (US$)
Output Capacitor Type
PSRR @ 100KHz (dB)
Accuracy (%)
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package Size: mm2:W x L (PKG)
TPS7B63-Q1 TPS7B68-Q1
Fixed Output     Fixed Output    
0.3     0.5    
40     40    
4     4    
5     5    
3.3     3.3    
HTSSOP | 16     HTSSOP | 28    
Power Good
Watchdog Timer    
Power Good
Watchdog Timer    
1     1    
-40 to 125     -40 to 125    
40     38    
0.98 | 1ku     1.15 | 1ku    
Automotive     Automotive    
55     50    
2     2    
300     150    
0.019     0.019    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)