ROHM's New LDO Regulators with 500mA Output Current: Achieving Stable Operation with Ultra-Small Capacitors

Executive Summary

• ROHM Semiconductor introduced the BD9xxN5 Series of LDO regulator ICs, delivering 500 mA output current with ultra‑stable “Nano Cap™” control.
• The new series supports operation with very small output capacitors (as low as ~470 nF) and achieves a low voltage ripple (~250 µV), enabling space‑saving designs for automotive, industrial and consumer applications.
• Mass production began in October 2025 with a monthly capacity of 300 k units; the parts are now available through major distributors and include downloadable high‑precision SPICE models.

Key Details

• Product Line: BD9xxN5 Series – 18 LDO regulator variants for 12 V/24 V primary power supplies.
• Output Current: 500 mA (≈3× the earlier BD9xxN1 150 mA series).
• Capacitor Requirements: Stable operation with output capacitors as low as 470 nF (typical) and even sub‑µF MLCCs such as 0603 size.
• Voltage Ripple: Approximately 250 µV across load current range of 1 mA to 500 mA within 1 µs.
• Production Capacity: 300,000 units per month, started October 2025.
• Availability: Sold online via DigiKey, Mouser, Farnell and other distributors.
• Design Resources: High‑precision “ROHM Real Model” SPICE models provided for simulation (model codes: BD900N5xxx‑CBD933N5xxxx‑CBD950N5xxxx‑C).
• Target Applications:
• Automotive – fuel injection, TPMS, body control modules, infotainment clusters, HUDs.
• Industrial – PLCs, RTUs, gateways, analog sensor interfaces, disaster‑prevention panels, HMI power supplies.
• Consumer Electronics – refrigerators, dishwashers, air conditioners, thermostats, doorbells, home security and networking equipment.
• Technology Highlight: Nano Cap™ ultra‑stable control combines advanced analog circuit design, process optimization, and layout within ROHM’s vertically integrated production system to eliminate instability caused by small capacitors.

Notable Quotes

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