ROHM has developed the ‘BD9xxN5 Series’ of LDO regulator ICs with 500mA output current, featuring its proprietary ultra-stable control technology Nano Cap. This series comprises 18 products designed for 12V/24V primary power supply applications used in automotive equipment, industrial equipment, and communication infrastructure.
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 1 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 (0.6 × 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.
ROHM will continue to contribute to the high performance, miniaturisation, and high reliability of electronic devices by further expanding its Nano Cap technology-equipped LDO series.
Application examples
Automotive equipment
Powertrain system power supplies for fuel injection systems (FI) and tire pressure monitoring systems (TPMS)
Body system power supplies for body control modules (BCM)
Infotainment system power supplies for clusters ad head-up displays (HUD), etc.
Industrial Equipment
Power supplies for controllers like Programmable Logic Controllers (PLC), Remote Terminal Units (RTU), and industrial gateways
High-precision LDOs for analogue loads and sensors measuring temperature, pressure, flow rate, etc.
Power supplies for monitoring and control panels in disaster prevention systems, access control systems and building automation.
Standby power supplies for Human-Machine Interfaces (HMI) and panel equipment, etc.
Consumer electronics
Power supplies for control boards in refrigerators, dishwashers, air conditioners, etc.
Power supplies for home appliances like thermostats and doorbells
Power supplies for constant power applications in home security and network equipment, etc.
What is Nano Cap Technology?
Nano Cap refers to ultra-stable control technology achieved by combining advanced analogue expertise covering circuit design, processes, and layout utilising ROHM’s vertically integrated production system. Stable control eliminates the problem of unstable operation related to capacitors in analogue circuits, contributing to a reduction in design resources for a wide range of applications in automotive, industrial equipment, consumer, and other fields.
