NJU7231F52-TE1

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When designing a system engineering with modern electronics, special attention must be given to the power management and voltage regulation strategies within the system. This is especially true in more resource-limited settings such as mobile phones, tablets and embedded systems. NJU7231F52-TE1 is a linear regulator dedicated for battery power applications in mobile electronics that provides high efficiency with flexible voltage control and advanced protection features. In this paper, the application field and working principle of NJU7231F52-TE1 will be discussed.

Application Field

NJU7231F52-TE1 is a linear voltage regulator designed to provide highly efficient and careful power management in the most battery-constrained applications, such as mobile phones and portable electronic devices. It is optimized for use with one-cell lithium ion batteries, allowing a wide input voltage range of 3.2V to 4.5V. The output voltage is customizable within the range of 1.2V to 3.0V.

The natural choice of NJU7231F52-TE1 for battery-powered applications comes from its excellent efficiency. Thanks to some common techniques such as power-thinning, integrated low quiescent current and shutdown control, NJU7231F52-TE1 can reach a quiescent current as low as 0.7µA. Under normal operating conditions, the efficiency of NJU7231F52-TE1 at 1mA load is above 90%, with a maximum efficiency of 94.6%.

Moreover, NJU7231F52-TE1 provides various protection features ensuring a safe and secure system operation. These features include Over-Current Protection (OCP), Over-Voltage Protection (OVP), Over-Temperature Protection (OTP) and most importantly, Reverse Polarity Protection (RPP). The RPP feature prevents the battery from being drained when connected the wrong way and protects whatever is connected to the battery.

In short, NJU7231F52-TE1 is a reliable, cost-effective and high-performance voltage regulator tailored for smart phone and digital device applications.

Working Principle

The basic idea behind voltage regulators is to buffer a voltage source/sink, allowing a consistent voltage output despite fluctuations or other undesirable items presenting in the input. NJU7231F52-TE1 is a linear voltage regulator utilizing the common series configuration. A series regulator works by adjusting the current flowing through the linear element, in this case an external transistor, allowing the voltage at the output pin to remain low.

NJU7231F52-TE1 performs the basic duties of providing a constant voltage output and current source from the input voltage/current, ensuring a reliable system operation. For doing that, it utilize a state-of-the-art linear scheme mixed with several protection features.

NJU7231F52-TE1\'s linear scheme consists of three main components: the reference voltage block, the differential amplifier, and the control system. The first block provides a known voltage against which the input voltage is compared. The second control block is a differential amplifier which compares the input voltage and the feedback voltage. This difference is then fed to the final block, the control system, which adjusts the duty cycle of the external transistor. To maintain output voltage stability, the feedback voltage is compared to the reference voltage by the error amplifier and fully regulated.

Finally, the NJU7231F52-TE1 also contains a protection and security circuit. This circuit is designed to protect the output pin from any over-voltage or over-current risk. This circuit triggers when any of the protection conditions are met, such as a fluctuating input, an excessive load or an over-temperature environment. When activated, this circuit sends a signal to the control circuit, ordering it to switch-off the external element and protect the output terminal, providing a safe and secure system operation.

Conclusion

NJU7231F52-TE1 is an excellent linear voltage regulator that combines efficiency, flexibility and security in a small form factor. Optimized for mobile electronics’ battery power applications, NJU7231F52-TE1 provides a wide range of input voltage and configurable output voltage, an outstanding efficiency even at low load and a thorough protection feature set. The internal circuit works by using a basic series regulator topology, implemented with high-end linear elements. All these features make NLU7231F52-TE1 an ideal voltage regulator for modern mobile electronics.

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