ROHM expands nano cap LDO portfolio with 500 mA devices
ROHM has extended its Nano Cap linear regulator portfolio with a 500 mA LDO series aimed at applications that require stable regulation while using very small output capacitors. The BD9xxN5 family targets 12 V and 24 V primary supply rails commonly found in automotive, industrial, and infrastructure systems.
For eeNews Europe readers, the announcement is relevant because capacitor-independent LDO behaviour can simplify power-tree design, reduce board area, and ease qualification when space-constrained layouts or long supply lines are involved.
Higher current with reduced capacitor constraints
The BD9xxN5 series builds on ROHM’s earlier BD9xxN1 Nano Cap LDOs, which supported stable operation at 150 mA using output capacitors as small as 100 nF. With the updated architecture, ROHM increases the output current to 500 mA, potentially broadening applicability to higher-load subsystems while retaining similar stability characteristics.
According to the company, the LDOs can operate with output capacitors of 470 nF (typical) while maintaining low output voltage ripple, even during rapid load transients. ROHM specifies a ripple of around 250 mV for load steps from 1 mA to 500 mA within 1 µs. Support for ultra-small MLCCs, including 0603M packages with capacitances below 1 µF, is intended to give designers more flexibility in component choice where larger ceramic or electrolytic capacitors are impractical.
The devices are designed for input voltages associated with automotive and industrial supply domains and are positioned for use in environments where board space, routing constraints, or vibration can complicate capacitor selection.
Target applications and design support
ROHM positions the 500 mA LDO regulators for a wide range of systems, including automotive powertrain and body electronics, industrial controllers and gateways, and consumer control boards. Typical use cases include sensor supplies, standby rails, and analog loads that require predictable regulation behaviour across varying load conditions.
Mass production of the BD9xxN5 series began in October 2025, with availability through major distribution channels. To support design and validation, ROHM provides high-accuracy SPICE models through its “ROHM Real Model” programme, allowing engineers to simulate transient and stability behaviour more precisely during development.
The company states that it plans to continue expanding its Nano Cap technology across additional LDO variants, with a focus on supporting higher performance and miniaturisation requirements in automotive and industrial electronics.
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