Sophisticated devices supporting multiple output voltages and functional safety for ASIL-D applications
Toshiba Electronics Europe announced the launch of a range of general-purpose system power ICs with multiple-outputs. The new devices support functional safety according to ISO26262 for safety-critical automotive applications including those that require extremely high safety such as electric power steering systems (EPS) and braking systems where ASIL-D is required.
The series comprises four devices with various output voltages generated by a buck converter – 1.1 V (TB9045FNG-110), 1.2 V (TB9045FNG-120), 1.25 V (TB9045FNG-125), and 1.5 V (TB9045FNG-150). The four output voltages from each device can be used to power the core of an MCU, as well as being used for sensors and other interfaces.
A buck-boost converter generates 6 V from the automotive battery and is capable of operating with input voltages as low as 2.7 V to ensure constant voltage, even during cranking operations when the battery voltage drops significantly. The devices are suited to input voltages as high as 18 V and can operate over the temperature range –40 to +125 °C. They are housed in a tiny HTSSOP48-P-300-0.50 package, measuring just 6.1 mm × 12.5 mm × 1.0 mm making them ideal for modern densely packed automotive applications.
The TB9045FNG series includes a range of fault detection features, essential to providing functional safety. This includes over voltage for the DC-DC converter and under voltage lockout (UVLO) for the battery power supply as well as thermal shutdown and a circuit to monitor the oscillator frequency. A watchdog timer is included to detect errors on the external MCU as well as the ability to detect latent faults that would indicate a potential failure. Reporting of any issues can be configured via the SPI interface using a dedicated register, allowing the IC to be used in a wide variety of systems.
To support designers, Toshiba provides a full suite of documentation including a functional safety FMEDA to assist with safety design and analysis of systems.
Volume production for the new power ICs is scheduled for November 2019 with a planned capacity of around 1 million units annually.
