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Automotive 500mA 40V High-Voltage Ultra-Low-Iq Watchdog LDO Regulator


Package | PIN: PWP | 28
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $2.73
10-24 $2.44
25-99 $2.27
100-249 $1.98
250-499 $1.82
500-749 $1.53
750-999 $1.26
1000+ $1.15


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating TemperatureRange
    • Device HBM ESD Classification Level 2
    • Device CDM ESDClassification 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 atLight 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
    • ThermalShutdown
  • 28-Pin HTSSOP Package

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Texas Instruments  TPS7B6850QPWPRQ1

In automotive microcontroller or microprocessor power-supply applications, the watchdogis used to monitor the microcontroller working status to prevent software runaway. It is necessaryfor 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 operatingvoltage up to 40 V, with typical quiescent current of only 19 µA at light load. The devicesintegrate a programmable function for selecting a window or standard watchdog, with an externalresistor to set the watchdog time within 9% accuracy.

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