New Buck-Boost Power Supply Chipset ensures stable performance with Industry-Low Current Consumption

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ROHM has recently 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 (Electronic Control Units) 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 result is an industry-best no-load current consumption of 8uA and ±100mV output voltage fluctuation utilizing an output capacitance 44uF (70% less current consumption and 50% less output capacitance vs conventional products), contributing to improved stability and energy savings in applications where significant input voltage drops occur in a short period of time, such as start-stop vehicle systems.

Key Features:

  • Achieves the industry’s best current consumption and responsiveness

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.

  • Provides the industry’s first switchable buck/buck-boost power supply on the same board

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. 

  • Contributes to stable operation with low noise performance while eliminating AM radio interference

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.

 

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