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Toshiba Launches New Universal Power ICs “TB9045FNG”

Hongkong, December 10, 2019-Toshiba Electronic Components and Storage Devices Co., Ltd. (“Toshiba”) today announced the launch of a new universal power IC, “TB9045FNG”, which implements automotive applications through multiple outputs Security [1]. The new IC is offered in four versions with output voltages from 1.1V to 1.5V. Mass production has begun this month.

ASIL-D [2] is the highest automotive safety integrity level specified in the ISO 26262 functional safety standard. According to ASIL-D, more and more safety-related subsystems in automotive electronic systems such as electric power steering (EPS) and electronic braking must meet their specifications.

Toshiba Electronics’ new IC integrates a variety of fault detection functions, such as high and low voltage circuit detection, overheat detection, and frequency monitoring. At the same time, in order to monitor the abnormal situation of the external microcontroller, this IC also integrates a watchdog timer function. In addition, in order to detect latent faults to ensure a higher level of functional safety, the IC also has a built-in diagnostic circuit for fault detection circuits.

In addition, Toshiba has also carried out a series of functional safety analyses to simulate system failures, and will also provide customers with documents such as functional safety FMEDA [3] to support overall safety analysis and design.

Main Features

  • 1.Built-in step-down DC-DC converter This IC generates a 6V output from a high efficiency buck-boost DC-DC converter. Taking into account the voltage drop after idling reduction, the low-side operating voltage range of the battery is improved to make it as low as 2.7V (minimum).
  • 2.Built-in step-down DC-DC converter (voltage optional) Converts the 6V input power generated from the buck-boost DC-DC converter to a variety of output voltages: 1.1V (TB9045FNG-110), 1.2V (TB9045FNG-120), 1.25V (TB9045FNG-125), and 1.5V (TB9045FNG-150). Depending on the MCU’s specifications, a suitable version of the new IC can be selected as the core’s external power supply.
  • 3. Built-in 4 serial power supply [4] circuits (4 outputs) This IC has 4 built-in series power circuits for receiving the 6V input generated by the DC-DC converter. One of them is a 5V constant voltage circuit (current capacity is 400mA) for powering the microcontroller, and the other three are 5V constant voltage output circuits (current capacity is 100mA) for powering sensors and other interfaces. Each circuit can independently output voltage.
  • 4.Various built-in monitoring circuits for functional safety–Low voltage detection circuit for battery power; DC-DC converter (6V) high voltage detection circuit; High voltage / low voltage detection circuit for DC-DC converter (1.1V / 1.2V / 1.25V / 1.5V) and series power supply (5V) Overheating detection circuit; Oscillator frequency monitoring circuit; Watchdog timer circuit to monitor external MCU.
  • 5. Diagnostic circuit, fault detection circuit for functional safety– Built-in diagnostic circuit in the fault detection circuit is used to detect any latent fault.
  • 6.Fault response mode is available -By using the SPI [5] communication input setting function, the user can set the system so that it can respond to a detected fault in one of two ways. One setting outputs a reset signal to the system; the other setting sends an abnormal operation notification to the system. Users can choose according to their application or system.

Notes:

  • [1] Based on functional safety standards, designed to minimize the risk of system failure. The purpose of the ISO 26262 certification is to confirm that a company’s process or product for electrical and electronic (E / E) systems for automotive applications meets the stringent standards specified in the standard, and at the same time provides an independent means for third parties to assess the capabilities of potential suppliers.
  • [2] ASIL: automotive safety integrity level, the highest automotive safety integrity level specified in the ISO 26262 functional safety standard.
  • [3] FMEDA: Failure Mode Impact and Diagnosis Analysis
  • [4] Series power supply: DC power supply circuit, in which the voltage control element is connected in series with the load.
  • [5] SPI: Serial Peripheral Interface

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