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Multi-output system power supply aimed at cars

Posted: 31 Oct 2013     Print Version  Bookmark and Share

Keywords:Toshiba  power supply  TB9042FTG  automotive application  ISO 26262 

Toshiba Corp. has introduced a multi-output system power supply IC that promises to enhance monitoring functions in general automotive applications. According to the firm, the TB9042FTG's built-in highly electrically efficient DC/DC converters reduce power consumption, and its series regulators realise low noise power supply.

The increasing importance of ISO 26262, the international standard for "Road Vehicles—Functional Safety", requires monitoring of the functions of power supply ICs. The IC incorporates multiple monitoring functions that detect any malfunctions of the IC and external MCUs. It also integrates a transmitting function that transfers data on monitoring status to an external MCU, which further supports improved safety

The product incorporates abnormality detection for each output and transmits the detected data from either the SPI terminal or a special terminal dedicated to abnormality signals. It has an integrated diagnostic function that monitors malfunction of the IC by comparing its data and signals from a MCU, helping to realise automotive functional safety.

The TB9042FTG features built-in 2 channels of DC/DC converters (1 output) and built-in 3 channels of series regulators for external power supply (3 outputs). One DC/DC converter steps down power supply from the vehicle battery to 6V; the other converter steps that down to 1.2V or 1.5V (selectable) for the MCU core, continued Toshiba.

The two series regulators convert the 6V supply from the DC/DC converter and independently provide constant 5V supplies: 400mA current capacity is used for the MCU and 100mA current capacity is used for a sensor or other interface.

The other series regulator takes power from the battery and supplies 5V or 3.3V power (selectable), which is used as back-up power supply to protect the MCU's RAM data.

Sample shipments will start on November 1, 2013, with mass production scheduled to start in May 2014.





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