Housed in a 6.1x12.5x1.0 mm HTSSOP48-P-300-0.50 (Gesundheit!) package the TB9044FNG from Toshiba integrates various failure detection functions such as high- and low-voltage detection as well as overheat detection of its power supply circuit to monitor the well-being of the IC itself, but also a watchdog timer for failure detection of an external MCU. A diagnosis circuit to detect latent faults in the failure detection circuits is also incorporated to secure higher functional safety. Together all this monitoring circuitry provide the highest levels of functional safety to enable car designs to meet ASIL-D requirements.
A high-efficiency buck-boost DC/DC converter pre-regulates the output voltage to 6 V which is regulated further down to 5 V with LDOs. In order to support voltage drops during cranking, the input voltage range extends down to 2.7 V. Four 5 V outputs are available, one with a current capacity of 400 mA while the three others can deliver up to 100 mA.
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General-purpose power IC meets ASIL-D requirements
December 21, 2015 | 20:32
Now that more and more safety-critical automotive systems such as electric power steering (EPS) and braking are required to satisfy the Automotive Safety Integrity Level (ASIL) D standard, electronic components must be enhanced with monitoring circuitry.