Rohm
LDO regulator with 500mA and Ultra-small Capacitors
Rohm's BD9xxN5 series LDO regulators deliver up to 500 mA output current and utilise the company's proprietary Nano Cap control for high stability. The series comprises 18 variants for 12 V and 24 V applications in automotive, industrial and communication systems.
In recent years, electronic devices have demanded higher density in smaller form factors at the same time. To meet this demand and achieve space savings and design flexibility, power supply ICs must be capable of stable operation even with small-capacity capacitors. However, achieving such performance with output capacitors of 1µF or less has been technically difficult.
To address this challenge, Rohm developed the »BD9xxN1 Series« LDO regulator (150mA output current) in 2022, incorporating its proprietary ultra-stable control technology, »Nano Cap«. This innovation enables stable operation with output capacitors as small as 100nF, earning widespread adoption across numerous applications.
The newly developed BD9xxN5 Series builds on the success of the BD9xxN1 Series by increasing the output current to 500mA – more than three times higher than before – significantly broadening its suitability for applications requiring higher power. In addition, very low output voltage ripple of approximately 250mV (with load current variation of 1mA to 500mA within 1µs) is achieved with a small output capacitance of just 470nF (typical). Beyond standard small MLCCs (multi-layer ceramic capacitors) in the range of several µF and large-capacity electrolytic capacitors, it also supports ultra-small MLCCs, such as the 0603M size (0.6mm × 0.3mm), with capacities below 1µF – where stability was previously difficult to achieve. This contributes to space saving as well as greater flexibility in component selection.
Mass production of this series commenced in October 2025 at a monthly production capacity of 300K units. It is also available for purchase online through online distributors such as DigiKey, Mouser and Farnell.
Furthermore, high-precision SPICE models, »ROHM Real Model« are provided for accurate simulation and can be downloaded from the ROHM official website.
