With its proprietary ultra-stable control technology, “Nano Cap,” ROHM has developed the “BD9xxN5 Series” of LDO regulator ICs with a 500mA output current. The 18 products in this series are designed for application as 12V/24V primary power supplies in industrial, automotive, and communication infrastructure applications.
Electronic devices have required higher density in smaller form factors in recent years. Power supply ICs must be able to operate steadily even with small-capacity capacitors in order to satisfy this demand, save space, and provide design flexibility. However, it has been proven technically difficult to achieve such performance with output capacitors of 1µF or less.
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.
- 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 (sample price: $2.0/unit, tax excluded).
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.
SPICE Models: BD900N5xxx-C BD933N5xxxx-C BD950N5xxxx-C
ROHM will continue to contribute to the high performance, miniaturization, 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 analog 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.
