BD9139MUV-E2

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BD9139MUV-E2 Application Field and Working Principle

BD9139MUVE2 is a DC DC switching regulator integrated circuit for step-down applications, included in the PMIC (Power Management IC) - Voltage Regulators - DC DC Switching Regulators family. It offers high-efficiency target voltage, current, and temperature monitoring features and controls an on-chip synchronous buck regulator. Inside, it also includes protection circuits such as under voltage lock-out (UVLO), over current protection (OCP), and thermal shut down (TSD), so that it is able to suit various system requirements.

This specific device from BD9139MUV-E2 family is mainly used in a variety of battery-powered applications, including portable consoles, e-book readers, tablet computers, and audio players. With a variety of output power options, BD9139MUVE2 can provide high-efficiency DC-DC regulation solutions to these applications in multiple voltage generations. Its special low-transfer current (I_Sk) mode can help prolong the battery life in battery-powered applications.

The working principle of BD9139MUVE2 is based on the voltage conversion and control of the buck regulator. At its core, an inductor, a switching transistor, and a power diode are connected to the input voltage VIN and output voltage VOUT. A PMOS transistor is utilised as a switching transistor to connect and disconnect the power diode and the inductor. In such a way, the energy stored in the inductor is transferred and converted to the output voltage in sequence, controlling the transistor and the duty ratio D. The input voltage, VIN, and the output voltage, VOUT, can be controlled within a 0.48~10V user-defined output voltage range with the highest efficiency up to 91%.

Moreover, BD9139MUVE2 is equipped with a variety of embedded functions, most notably Burst Mode, which, when enabled, lowers the input current through power saving technique, minimizing the power consumption. Maximum 4A, 2A, and 0.6A output current capabilities are available. And the selectable high/low noise mode allows the user to adjust the noise level according to the application requirements. Last but not least, the device\'s low start-up time is just 100μs.

In conclusion, the BD9139MUVE2 DC DC regulator is a high-performance device designed for low-voltage, battery-powered applications such as portable consoles, e-book readers, tablet computers, and audio players. Through the voltage conversion and control of the buck regulator, it offers a variety of output power options, high efficiency, low input current, and low start-up time for these applications. With the protection circuits such as under voltage lock-out (ULO), over current protection (OCP), and thermal shut down (TSD), the device can suit various system requirements.

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