New Automotive Primary DC/DC Converters Offer Stable Output, Even with Fluctuating Input Voltage - Seite 2

ROHM is committed to continuing to support the evolution of vehicles by developing products that contribute to lower power consumption and higher system reliability.

Key Features

The new DC/DC converters leverage original Nano Pulse Control technology to achieve an unprecedented step-down ratio combined with stable operation and high efficiency. Qualification under the AEC-Q100 automotive standard has also been acquired, guaranteeing high reliability even under harsh vehicle environments.

1. Enabling stable operation without overshoot even during battery voltage fluctuations

ROHM’s new products suppress voltage overshoot to less than 1/10th of that of conventional products when the input voltage drops below the output set voltage, keeping the output voltage to the specified voltage before fluctuation occurred. This allows users to eliminate additional capacitors typically required as a countermeasure for overshoot, ensuring stable operation even in the event of sudden battery voltage drop (e.g., cranking).

2. High efficiency over a wide range of load currents contributes to lower power consumption

These new power supply ICs simultaneously achieve high efficiency and fast response. Conventional power supply ICs require large drive currents to ensure fast response, making it difficult to provide both high efficiency and fast response at light loads. The BD9P series utilizes a new control method to deliver sufficiently faster response at lower drive currents than that of standard products. This translates to 92% conversion efficiency at heavy loads (at 1A output current) and 85% efficiency at light loads (1mA). Providing leading-class efficiency at both light and heavy loads reduces power consumption while driving, as well as when the engine is stopped.

3. Nano Pulse Control ensures high step-down ratio and stable operation

Adopting original ultra-high-speed pulse control technology, Nano Pulse Control enables high speed operation at 2.2MHz that will not interfere with the AM radio band (1.84MHz max.). Stable output of 3.3V~5.0V for driving latter stage devices can be achieved with an input of 40V max. Additionally, a spread spectrum function is built in that reduces noise peaks, making them ideal for automotive applications exposed to high levels of radiated noise.