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ROHM Semiconductor
Automotive Regulator Selection Guide

Automotive Regulator Selection Guide

Product catalog summary

Introduction
The document discusses the transformation in the automotive sector, focusing on the rise of electric vehicles (EVs) and autonomous driving systems. It highlights ROHM's commitment to providing high-quality automotive-grade semiconductors, utilizing technologies like Nano Pulse Control™ and Quick Buck Booster™ to enhance efficiency and reduce environmental impact.

Types and Features of Automotive Power Supply ICs
Automotive power supply ICs are categorized into switching regulators and linear regulators. Switching regulators are noted for their conversion efficiency and low heat generation, while linear regulators are valued for their ease of configuration and cost-effectiveness.

Switching Regulators
The document details a comprehensive lineup of automotive switching regulators, including primary and secondary types, with a focus on noise and heat dissipation countermeasures. Key specifications and product tables are provided to assist in selection.

Linear Regulators
Similar to switching regulators, the guide covers primary and secondary linear regulators, emphasizing their suitability for low power applications and highlighting their low noise and cost-effective nature.

Technical Specifications and Product Lineup
Specifications for various regulator products are detailed, including input/output voltage ranges, switching frequencies, and package types. Application circuit examples and efficiency graphs illustrate performance under different conditions.

Technological Innovations
ROHM's proprietary technologies, such as Nano Pulse Control™, are discussed, showcasing their role in achieving high efficiency and stable operation. The importance of functional safety standards like ISO26262 in product development is also covered.

Conclusion
The guide concludes with ROHM's approach to ensuring high quality and stable supply of automotive-grade products, supported by a robust manufacturing and support system. Guidance on accessing further resources through ROHM's website and global locations is provided.

Product Overview
The document provides detailed technical specifications for various ROHM semiconductor products, including the BD9901xEFV-M series, BD9015KV-M/BD9016KV-M, BD8P250MUF-C, BD90302NUF-C, and BD9035AEFV-C, focusing on high efficiency, low quiescent current, and compact design.

Key Features and Technologies
Key technologies highlighted include synchronous rectification, Quick Buck Booster™, and Nano Pulse Control™, contributing to high efficiency, compact design, and reduced power consumption. Common protection features include overcurrent, short-circuit, thermal shutdown, and under/over voltage protection.

Secondary Linear Regulators
The document provides a guide on automotive secondary linear regulators, focusing on the BDxxG/H/IxxMEFJ-M(C) and BUxxJA2MNVX-C series, emphasizing proper thermal management and electromagnetic compatibility (EMC).

Thermal Management and EMC Considerations
Thermal resistance parameters and EMC considerations are discussed, emphasizing robust circuit design and proper PCB layout to prevent noise-related malfunctions. Standards like CISPR25 and ISO11452 are referenced.

Mechanical Integration and Heat Dissipation
The importance of heat dissipation design technology in engine compartments is highlighted to prevent quality and lifespan reduction of electronic components.

Automotive Immunity and Emission Tests
Various test methods and standards are outlined, including BCI Immunity, Transient Immunity, and Radiated Immunity, with references to standards like ISO11452 and CISPR25.

ROHM's Approach to Quality and Manufacturing
ROHM's vertically integrated production system is detailed, emphasizing a 'Quality First' approach and the use of in-house production systems for quality control and traceability.

Automotive-Grade Product Initiatives
ROHM implements real-time quality checks and robust design practices to ensure high reliability, with compliance to standards like JEITA, JEDEC, and AEC-Q100/101/200.

Global Presence and Facilities
ROHM's global locations, including sales offices, manufacturing facilities, R&D centers, and QA centers, are listed, highlighting the company's extensive network and capabilities.

Technical Resources and Support
ROHM provides a range of technical resources on its website, including datasheets, application notes, SPICE models, and design support content to assist designers in selecting and implementing ROHM products effectively.

Catalog excerpts

Automotive Regulator Selection Guide Ver.3.2 Creating the future of Automobiles

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In recent years the mobility sector has reached a period of major change with the increasing proliferation of EVs and autonomous driving systems, driving the demand for automotive-grade semiconductors. ROHM has consistently provided a stable supply of high quality products and solutions by leveraging an integrated development system and industry-leading technologies cultivated since the company was established in 1958. Even now, ROHM continues to develop products that minimize environmental impact in the mobility sector by taking advantage of proprietary groundbreaking technologies such as Nano...

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Linear Regulators Automotive Regulator Selection Guide 02

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Automotive Switching Regulator Lineup Output Current(A) Synchronous Secondary rectification ^Nano Nano Pulse Control™ JSSCG Spread spectrum function ^LLM Light load mode Series Name Series Name Series Name Maximum rating Buck-Boost External Synchronization External Synchronization External Synchronization External Synchronization 03 Automotive Regulator Selection Guide

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125˚C: 125˚C compatibility External Synchronization External synchronization function Note: Nano Pulse Control™ is a trademark or registered trademark of ROHM Co., Ltd. Automotive Regu

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High Speed Response Solution Low Quiescent Current + High Speed Response Solution BD9Pxx5EFV-C/ BD9Pxx5MUF-C Application Circuit The BD9Pxx5EFV/ MUF-C are low quiescent current buck DC/ DC converters that integrate ROHM’s proprietary Nano Pulse Control™ technology. This enables stable operation even at high step-down ratios. In addition to heavy loads, LLM (Light Load Mode) achieves high efficiency and low current consumption even during light loads. What’s more, a minimum operating voltage of 3.5V ensures exceedingly stable output even during cold cranking. Overview: BD9Pxx5EFV/MUF-C series...

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BD906x0EFJ-C/BD906x0HFP-C series Low Voltage Operation Low Voltage Operation Solution Flexible Design The BD906x0EFJ-C/BD906x0HFP-C are switching regulators with built-in high voltage power MOSFET that allows the operating frequency to be arbitrarily set via external resistors. Features include a wide input voltage(3.5V to 36V) broad operating temperature range(-40°C to +125°C), and the ability to synchronize with an external clock using the external synchronization input pin. In the case of stop-start vehicles, normal operation is required even during severe voltage drops from conventional cranking...

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Primary Switching Regulators BD9901xEFV-M series BD9901xEFV-M series Application Circuit Diagram Low Quiescent Current Solution The BD99010EFV-M and BD99011EFV-M are low Iq buck DC/DC converters with built-in 3.3V and 5V power MOSFETs, respectively. In addition to achieving high efficiency while maintaining regulated output voltage during heavy loads, LLM(Light Load Mode) ensures high efficiency and low current consumption even during light loads. The minimum operating voltage of 3.6V maintains output even during cold cranking. Also, current mode control enables fast response with easy phase...

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B Buck-Boost Primary Switching Regulators BD8P250MUF-C+BD90302NUF-C The BD8P250MUF-C is a 5V fixed output synchronous rectification buck DC/DC converter with boost control function. In the event output voltage drop is permitted when the input voltage decreases (i.e. during cold cranking), it is used as a buck DC/DC converter, and in cases where the output voltage needs to be maintained it can function as a buck-boost DC/DC converter by connecting to a dedicated boost FET. In addition, Quick Buck Booster™ technology provides high-speed response during buck-boost operation, allowing the capacitance...

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60V Input High Step-down Ratio Switching RegulatorBD9V100MUF-C Application Circuit Diagram Power supply solution for 48V hybrid systems The BD9V100MUF-C utilizes ROHM’s ultra-fast pulse control technology Nano Pulse Control™ to achieve a high step-down ratio of up to 24:1 at 2MHz. For example, 2V output is possible from a 48V power supply at 2MHz. This makes it possible to reduce the number of power ICs required for step-down from high voltage to low voltage from two or more with conventional solutions to just one, contributing to set miniaturization and simpler system design. VIN PVIN EN PGND...

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Technologies that Maximize the Features of Switching Regulators External Synchronization Function Increasing Switching Frequency A •anfunction that enables synchronous switching with external clock Shifts the second•affect the AM radioand third-order harmonics that band Includes functions primarily used for vehicle •multimedia systems frequency trade-off between AM and FM radio band noise ● High switching frequency above 2MHz does not generate a spectrum in the AM band ● Increasing the switching frequency above 2MHz increases the noise level in the FM radio band 400kHz operation Fundamental AM...

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Primary Switching Regulator Product Specifications TableBuck Solutions

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Automotive Regulator Selection Guide 12

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Compact-Large Current Space-Saving High Efficiency Solutions BD9Sx00MUF-C series Application Circuit Diagram The BD9Sx00MUF-C series are synchronous rectification buck DC/DC converters with integrated low ON resistance power MOSFET. These are offered in a compact 3.0x3.0mm package. The high 2.2MHz switching frequency (self-oscillation) supports smaller inductors while the built-in external synchronization function allows the switching frequency to be synchronized with an external pulse. In addition, LLM control ensures superior efficiency at light loads, making it possible to reduce application...

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BD9SxxxNUX-C series Space-Saving High Efficiency Solutions BD9SxxxNUX-C series Application Circuit Diagram The BD9SxxxNUX-C series are synchronous rectification buck DC/DC converters integrates a low ON resistance power MOSFET. These are offered in a compact 2.0x2.0mm package. The high 2.2MHz switching frequency (self-oscillation) supports smaller inductors. In addition, the built-in phase compensation circuit makes it possible to configure applications using few external parts. And current mode control ensures fast transient response. Also, fixed output models in the BD9Sx1xNUX-C lineup utilize...

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