ROHM: automotive-grade buck-boost power supply chipset

ROHM has announced the availability of a buck-boost power supply chipset that provides the lowest current consumption in the industry along with stable performance (transient response characteristics) in automotive ECUs for cluster panels and gateways used in start-stop vehicle systems. The chipset integrates a buck DC/DC converter with boost functionality (BD8P250MUF-C) and a dedicated boost IC (BD90302NUF-C). The primary chip (BD8P250MUF-C) utilizes ROHM’s novel buck-boost control technology, dubbed Quick Buck Booster, that enables configuration of a buck-boost power supply without degrading buck power supply characteristics by simply adding the dedicated BD90302NUF-C boost IC to the subsequent stage.

The BD8P250MUF-C buck DC/DC converter integrated in ROHM’s chipset utilizes Quick Buck Booster control technology developed by leveraging proprietary analog design expertise, making it possible to easily switch to buck-boost operation without degrading buck performance which features superior characteristics over buck-boost.

As a result, an output voltage fluctuation of ±100mV is achieved at a no-load current consumption of 8uA and 44uF output capacitance even in buck-boost configuration, making it the industry’s best buck-boost power supply (70% lower current consumption and 50% smaller output capacitance vs conventional products), contributing to greater energy savings and stability in a range of applications while reducing both the size and cost of the output capacitors.

ROHM’s chipset with Quick Buck Booster technology makes it possible to provide a common design that combines both buck and buck-boost power supply operation on a single board along with the requisite peripheral components and noise countermeasures. This makes it easy to switch from buck to buck-boost operation by simply adding a dedicated boost IC, reducing design load by as much as 50% compared with conventional methods utilizing separate power supply boards.

To meet market demands, the BD8P250MUF-C integrates a spread spectrum function as a countermeasure against noise (EMI), allowing it to clear the international standard (CISPR 25) for noise in the automotive sector. At the same time, ROHM's original ultra-high-speed pulse control technology Nano Pulse Control is utilized to enable high speed operation at 2.2MHz that eliminates the effects on the AM radio band (1.84MHz max.), making it possible to achieve stable 5V output for ECU drive from high-voltage 36V input. This ensures low electromagnetic interference while enabling low voltage output from high voltage input without AM radio band interference, contributing to stable operation in automotive systems sensitive to noise.

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