NJU7665CF-TE1

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NJU7665CF-TE1 is a compact DC-DC step-down regulator from the NJU discrete device family developed by New Japan Radio (NJR). The device is a fully-integrated, low-dropout, low-cost DC-DC regulator with an internal P-channel MOSFET setup that offers a wide input voltage range of 2.7V to 20V, a unique temperature profile and a 1.2V to 12V output voltage range.

It can be used for a wide range of applications including battery-powered systems, automotive systems, medical equipment, consumer electronics, and computing platforms, where voltage regulation and current limitation are required. It is available in a compact SOT23-6 package.

Application Field

NJU7665CF-TE1 is typically used in automotive systems powered by either multiple battery cells in series or by a single battery. Thanks to its overcurrent protection feature and wide input voltage range that spans from 2.7V to 20V, this device makes it suitable for automotive applications regarding vehicles with multiple battery cells in series. This wide voltage ranges provides compatibility with lead acid, Li-ion, and NiCd chemistries. Furthermore, the device’s wide operating temperature range of -40 to +85°C (with 6V input voltage) makes it suitable for automotive applications in extreme weather conditions.

The device is suitable for battery-powered electronic systems, such as those in medical, industrial, and consumer applications, where voltage regulation and current limitation are required. The low quiescent current consumption, along with the accuracy of the output voltage, makes it suitable for these applications.

The device is also appropriate for various applications that require a high degree of efficiency, high-power density, and low dissipation in order to reduce the system’s power consumption. It is suitable for portable systems where space is of critical importance. The device offers loads of features, but most significantly, it has a low output voltage ripple and low noise, making it very attractive for designing monitors, smart phones, and other high-end mobile devices.

Working Principle

The NJU7665CF-TE1 is based on a Pulse Frequency Modulation (PFM) scheme for step-down regulation. Input voltage is supplied to the PFM logic and is compared to a voltage reference. This produces an error signal that is used to control the switching of an internal P-channel MOSFET. The internal P-channel MOSFET branches the input voltage to a capacitor and diode network, resulting in a regulated output voltage.

The device uses proprietary control logic to dynamically adjust the switching frequency of the P-channel MOSFET in order to keep the output voltage within the regulation band. This PFM control scheme can be enabled or disabled via the input voltage pin.

The device also has a current limit circuit, which protects against an overload condition. When the output current exceeds its rated current, the current limit circuit will shut down the P-channel MOSFET and the output voltage will drop. When the overload condition is cleared, the P-channel MOSFET will be re-enabled, allowing the regulated output voltage to be restored.

The device also has a thermal protection circuit, which protects the device against an over-temperature condition. When the die temperature exceeds its rated temperature, the thermal protection circuit will shut down the P-channel MOSFET and the output voltage will drop. When the die temperature is below the rated temperature, the P-channel MOSFET will be re-enabled, allowing the regulated output voltage to be restored.

Conclusion

NJU7665CF-TE1 is a DC-DC step-down regulator that is designed for automotive systems and portable battery-operated systems. The device is based on a PFM regulation scheme and is capable of delivering up to 1.2V to 12V output voltage range. The device is housed in a compact SOT23-6 package, making it suitable for space-constrained applications. It also features a wide 2.7V to 20V input voltage range, wide operating temperature range of -40 to +85°C, current limit and thermal protection circuit, and low noise and low output voltage ripple makes this device very attractive for designing monitors, smart phones, and other high-end mobile devices.The specific data is subject to PDF, and the above content is for reference