ROHM’s Compact Primary LDOs with Highly Stable Output Voltage Stability Ideal for Redundant Power Supplies

ROHM developed the availability of primary LDO regulators: BD7xxL05G-C series (BD725L05G-C, BD730L05G-C, BD733L05G-C, and BD750L05G-C) featuring a rated input voltage of 45V and 50mA output current optimized for redundant power supplies that are increasingly being used in automotive applications to improve the reliability of vehicle power systems.

In recent years, the evolution of ADAS (Advanced Driver Assistance System) and other safety measures is requiring improved reliability for systems that supply power to these applications. As a result, redundant power supplies that can continue to operate core functions (sub-MCUs) even in the event of a main system malfunction are being increasingly incorporated in automotive power supply system. And as redundant power supply circuits are added to conventional systems, they must necessarily be space-saving and consume low power. ROHM's new products can be used as primary power supplies by taking advantage of original power supply technology accumulated over many years.

The compact (2.9mm × 2.8mm) BD7xxL05G-C series meets key requirements for building redundant power supplies by providing high withstand voltage (Max.=45V) with low current consumption (6.0μA typ.).

At the same time, leveraging ROHM’s strengths in analog technology ensures stable output voltage even during steep battery voltage fluctuations. Unlike standard products with an overshoot of almost 1.3V that requires a large output capacitor to prevent the rated voltage of downstream devices such as sub-MCUs from being exceeded, ROHM LDOs limit voltage overshoot to just 0.1V, supporting much smaller output capacitors (more info).