Key Features of the BD9xxN5 Series
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High Output Current Capability: Provides an output current of 500mA, significantly expanding the range of applications compared to the previous 150mA series.
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Stable Operation with Ultra-Small Capacitors: Nano Cap™ technology ensures stable operation with output capacitors as small as 470nF, allowing for miniaturization and flexible board design.
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Broad Application Range: Suitable for 12V/24V primary power supplies in a wide array of automotive, industrial, and consumer electronics.
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AEC-Q100 Qualified: Designed for automotive reliability, ensuring robust performance in demanding environments.
Mass Production and Availability
Mass production for the BD9xxN5 series began in October 2025, with a monthly production capacity of 300,000 units (sample price: 300 yen/unit, excluding tax). The products are available for purchase online through distributors such as:
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<a href="https://www.chip1stop.com/?dispUnqPartIds=ROHM0174010%7CROHM0174007%7CROHM0174008%7CROHM0174002%7CROHM0173474%7CROHM0174006%7CROHM0174003%7CROHM0180679%7CROHM0174004%7C&makerCd=ROHM&cid=rohmsite”>Chip One Stop
High-precision SPICE models, known as “ROHM Real Model,” are available for verification simulations and can be downloaded from the official ROHM website:
ROHM plans to continue expanding its LDO series featuring Nano Cap™ technology, aiming to contribute to the higher performance, miniaturization, and increased reliability of electronic devices.
Development Background
In recent years, the miniaturization and higher density of electronic devices have driven demand for power ICs capable of stable operation with small-capacity capacitors, enabling space-saving and greater design flexibility in power circuits. However, achieving stable operation with output capacitors of 1µF or less has traditionally been technically challenging.
In response to this challenge, ROHM developed the BD9xxN1 series (150mA output current) of LDO regulators in 2022, incorporating its unique ultra-stable control technology, Nano Cap™. The performance, which allowed stable operation with an output capacitor of just 100nF, has been highly praised and adopted in numerous applications. The newly developed BD9xxN5 series addresses applications requiring even larger currents, further assisting in resolving challenges related to output capacitors in power supply design.
Application Examples
Automotive Equipment:
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Powertrain power supplies such as fuel injection systems (FI) and tire pressure monitoring systems (TPMS)
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Body power supplies such as body control modules (BCM)
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Infotainment power supplies such as clusters and head-up displays (HUD)
Industrial Equipment:
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Controller power supplies for programmable logic controllers (PLC), remote terminal units (RTU), and industrial gateways
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High-precision LDOs for analog loads and sensors such as temperature, pressure, and flow
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Monitoring and control panel power supplies for building automation, disaster prevention, and access control systems
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Standby power supplies for human-machine interfaces (HMI) and panel equipment
Consumer Electronics:
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Control board power supplies for refrigerators, dishwashers, and air conditioners
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Residential equipment power supplies such as thermostats and doorbells
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Always-on power supplies for home security and network devices
About Nano Cap™
Nano Cap™ refers to ROHM’s ultra-stable control technology, achieved by integrating three advanced analog technologies: circuit design, layout, and process, within ROHM’s vertically integrated production system. By ensuring stable control, it eliminates stability issues related to capacitors in analog circuits, thereby contributing to reduced design man-hours across a wide range of applications, including automotive, industrial, and consumer equipment.
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Special Page: ROHM’s Innovative “Nano” Power Technology for Energy Saving and Miniaturization
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ROHM’s Monozukuri: “Nano Power Technology”
Nano Cap™ is a trademark or registered trademark of ROHM Co., Ltd.
Terminology Explanation
Primary (1)
In power ICs, “primary” refers to the first stage of conversion from a power source such as a battery. The subsequent second stage of conversion is called “secondary.”
LDO Regulator (Low Drop Out Regulator) (2)
A type of power IC that converts DC voltage to DC voltage. It has a small voltage difference between input and output and belongs to the category of linear regulators (where input and output voltages operate linearly). Compared to DC-DC converter ICs (switching regulators), LDOs have simpler circuit configurations and lower noise characteristics.
ROHM Real Model (3)
A high-precision SPICE model developed using ROHM’s unique model-based technology. It faithfully reproduces the electrical and temperature characteristics of actual ICs, allowing for a complete match between actual IC behavior and simulation values. This enables reliable verification, helping to prevent rework after physical prototyping and contributing to efficient application development.
