ROHM developed the high accuracy, ultra-low current consumption voltage detector BD48HW0G-C for automotive and industrial equipment requiring functional safety

PublishTime： 2022-09-01 Article Source：ROHM

ROHM developed the high accuracy, ultra-low current consumption voltage detector (reset IC) BD48HW0G-C. It is optimized for a wide range of automotive and industrial applications requiring voltage monitoring of electronic circuits for increased safety – including automotive electronic control units and factory automation equipment.

In recent years, continuing technological innovation in the automotive and industrial equipment sectors towards automation has spurred demand for greater safety. Along with this, to build safer systems, product development that takes into account safety guarantees (fail-safe and functional safety) in the event of an incident is required.

To date, ROHM has developed more than 1,000 voltage detectors which play an important role in ensuring the safety of equipment. With a comprehensive product lineup, ROHM ships over 250 million pieces annually (in FY2021) for a wide range of low voltage applications worldwide.

The new BD48HW0G-C Window-Type Voltage Detector utilizes high-voltage BiCDMOS processes along with ROHM's proprietary analog design technology. The aim: enabling operating voltages up to 40V and an industry-leading detection voltage accuracy of ±0.75%. At the same time, the detection voltage can be freely set, enabling high accuracy monitoring of abnormal voltages in a wide range of applications, from low voltage to high voltage, contributing to highly reliable systems with minimal incorrect fault events.

In addition, the BD48HW0G-C is leveraging ROHM's proprietary ultra-low current consumption technology Nano Energy™. It reduces current consumption to just 500nA (0.5μA, only 6% of standard products with equivalent functionality and accuracy). It enables the carefree application for an increased power consumption in automotive systems powered by battery when the engine is stopped. This also makes it suitable for voltage monitoring in various power supply circuits in automotive and industrial applications requiring functional safety.

Going forward, ROHM plans to expand its lineup of high voltage single-type voltage detectors with fixed detection voltage equipped with Nano Energy™ technology to provide greater safety in automotive and industrial environments.

New Product Summary

The BD48HW0G-C window-type voltage detector features a wide operating voltage range from 1.8V to 40V and an industry-leading detection voltage accuracy of ±0.75% (over the entire temperature range). In addition to a maximum operating voltage of 40V, the detection voltage can be freely set, enabling high accuracy monitoring of abnormal voltages in a variety of applications, at both low and high voltages, contributing to high reliability systems that maximize efficiency in automotive and industrial power supplies. The BD48HW0G-C achieves an ultra-low current consumption of 500nA by ROHM’s ultra-low current consumption technology Nano Energy™. This is only 6% of standard products with equivalent functions and accuracy, making it suitable for applications where increased power consumption is a concern.

Application Examples

◇ Automotive systems: Inverters in EVs/HEVs, electronic control units, ADAS, In-Vehicle Infotainment
◇ Industrial equipment: factory automation equipment, measurement instruments, sensor systems and further automotive and industrial applications requiring voltage monitoring.

What is Nano Energy™ Technology?

Nano Energy™ refers to proprietary ultra-low current consumption technology that achieves a quiescent current (no-load current consumption) on the order of nA by combining advanced analog technologies covering circuit design, layout, and processes utilizing ROHM's vertically integrated production system.

This contributes to not only extending the operating time of battery operated IoT and mobile devices, but also improved efficiency in automotive and industrial devices where increased power consumption is problematic.

Terminology

Voltage Detector (Reset IC), Window-Type

Used to monitor the voltage of electronic circuits, voltage detectors function by changing the output when the threshold detection voltage is exceeded, ensuring system safety in tandem with microcontrollers and other devices. Unlike standard voltage detectors (single type) that monitor the voltage on only one side (overvoltage or undervoltage), window-type voltage detectors can monitor the voltage on both sides, allowing a single product to fulfill both roles.

Functional Safety

Functional safety includes safety measures (concepts for ensuring safety) that minimize risk by adding functionality such as monitoring together with protective equipment. In the automotive market, functional safety minimizes risk to an acceptable level to prevent bodily injury in the event of malfunction due electronic system failure.

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