TPS7B6833QPWPRQ1

In automotive microcontroller or microprocessor power supply applications, a watchdog is used to monitor the operating state of the microcontroller and prevent software runaway. In reliable systems, the watchdog must be independent of the microcontroller. The TPS7B68-Q1 is a 500mA watchdog LDO designed for operating voltages up to 40V, with a typical quiescent current of only 19μA under light-load conditions. The device integrates a programmable feature for selecting window or standard watchdog mode, and uses external resistors to set the watchdog timeout period (within 10% accuracy). The PG pin on the TPS7B68-Q1 indicates when the output voltage has stabilized and is within the regulated range. The power-good delay period and power-good threshold are adjustable via external components. In addition, the device features short-circuit and overcurrent protection. This combination of features makes the device highly flexible for powering microcontrollers in automotive applications.

Applications

• Automotive MCU power supply
• Body Control Module (BCM)
• Body comfort module
• EV and HEV Battery Management System (BMS)
• Electronic gear shifter
• Transmission Control Unit (TCU)
• Electric Power Steering (EPS)

Key features

• Automotive electronics applications, AEC-Q100 compliant
• 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: 500mA
• 4V to 40V wide VIN input voltage range, transient voltage up to 45V
• Fixed output voltages of 3.3V and 5V, maximum dropout voltage: 600mV (at 500mA)
• Low quiescent current (IQ): <4μA when EN is low (shutdown mode), typical 19μA under light load (WD_EN high) with watchdog disabled
• Configurable for window watchdog and standard watchdog
• Switching window ratio configurable as 1:1 or 8:1
• Fully adjustable watchdog period (10ms to 500ms)
• 10% accuracy watchdog period