BD9C401EFJ-E2 Integrated Circuits (ICs)

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BD9C401EFJ-E2 is a DC DC switching regulator specifically manufactured by ROHM. This device integrates a controller, a power MOSFET, and a power Zener in a single package, allowing it to provide stable output voltage and a 15% reduction in output capacitance compared to conventional switching regulators. It also has high efficiency and low noise characteristics, as well as wide input voltage range from 3V to 28V. The device can also reduce the operating temperature and operating current, allowing for a longer usage period. In addition, the BD9C401EFJ-E2 is designed with a built-in over-current protection circuit, which provides additional safety and reliability.

Application Field

BD9C401EFJ-E2 DC DC switching regulator is mainly used for the DC-DC conversion and power supply applications, such as LED lighting, LCD displays, networking, automotive, audio, and industrial. More specifically, BD9C401EFJ-E2 can be used in applications with power up to 12W and an output current up to 2A. Due to its features like high-efficiency, low noise, low power consumption, and wide input voltage range, it is a widely used device in all kinds of DC-DC conversion and power supply applications.

Working Principle

BD9C401EFJ-E2 DC DC switching regulator uses a switching frequency modulation control method to control the output, and adopt a special process for eliminating noises. All these special technologies are incorporated to make the BD9C401EFJ-E2 applicable in all kinds of DC-DC conversion and power supply applications.

In this device, the power MOSFET is interfaced to an LSI via the built-in high-speed current comparator. This comparator detects the feedback voltage VFB and then provides the current control signal to the base of the power MOSFET. As a result, the voltage ripple current and on-state loss of the power MOSFET are kept at a minimum, improving the efficiency of the BD9C401EFJ-E2.

The current comparator has an over-current protection (OCP) circuit built in, so that when the current overloads, the OCP circuit will trigger a shutdown of the power MOSFET, protecting the BD9C401EFJ-E2 from potential damages caused by high current.

In conclusion, the ROHM’s BD9C401EFJ-E2 DC DC switching regulator is a widely used device for DC-DC conversion and power supply applications thanks to its high-performance and reliable features.

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