BD39012EFV-CE2

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The BD39012EFV-CE2 is a low cost, low power VCXO (Voltage-Controlled Crystal Oscillator) based voltage regulator from ROHM Semiconductor, specifically designed for supplying power to industrial HINs (High Isolation Network) applications. It is a linear + switching voltage regulator with adjustable output voltage range from 1.0V to 1.2V.

In a typical HIN system, a low noise, low power voltage regulator is used to provide the main power supply. HINs are used in networking, landline and wireless communication applications. As power consumption needs to be kept low for these applications, the BD39012EFV-CE2 is ideally suited for such requirements. It features an adjustable reference voltage and a wide 1.2 V to 3.6 V input voltage range, allowing it to operate in noisy and wide voltage range environments.

The BD39012EFV-CE2 also possesses a relatively high power efficiency of 98% and a low output noise of 24μVrms thanks to its switching regulator circuit and high-efficiency linear regulator (LDO) integrated into one package.

In addition, the device comes with over current detection control and over current protection, allowing the BD39012EFV-CE2 to survive high over current and short-circuit under high temperature environments for more reliable operation. Other features include short-circuit protection and over voltage protection, as well as a thermal shutdown and under voltage Lockout (UVLO) circuit.

The internal circuitry of the BD39012EFV-CE2 is composed of a switching regulator, voltage detector, and a built-in linear regulator (LDO). The following sections will describe in greater detail the application field and working principle of the BD39012EFV-CE2.<\p>

The BD39012EFV-CE2’s application field is in providing a low noise, low power voltage regulation for industrial HINs. HINs are used in a range of communication applications such as networking, landline and wireless communication, which need to be kept low in power consumption. The BD39012EFV-CE2’s adjustable reference output and wide input voltage range from 1.2 V to 3.6 V make it an ideal choice for such applications.

The working principle of the BD39012EFV-CE2 can be divided into two parts, the switching step and linear step, as shown in Figure 1. In the first step, a switching regulator converts the input voltage (Vin) to a fixed output voltage (Vo). This process consists of a comparison between the reference voltage, VREF, and the output voltage, Vo. If the reference voltage is higher than the output voltage, the pulse width modulated (PWM) circuit sends a high pulse width to the power switch (M1). Conversely, if the reference voltage is lower than the output voltage, the pulse width is decreased to reduce the power being outputted by the power switch (M1). In this way, the output voltage is regulated to achieve the optimal power efficiency.

The second step in the working principle of the BD39012EFV-CE2 is the linear step. In this step, the power output by the power switch is converted to the precise output voltage by the linear integrated circuit. This step is necessary due to the limited precision of the switching regulator, as it can only regulate the output voltage to a certain level. Therefore, the linear regulator is used to adjust the output voltage precisely.

The BD39012EFV-CE2’s voltage regulator includes a wide range of protective features such as over current protection, over voltage protection, thermal shutdown, and under voltage lock-out circuit. These features ensure a reliable operation even under extreme environmental conditions. The BD39012EFV-CE2 also possesses a relatively high power efficiency and a low output noise, making it the ideal choice for industrial HIN applications.

In conclusion, the BD39012EFV-CE2 is a low cost, low power VCXO-based voltage regulator designed to provide power to industrial HINs. It possesses a wide voltage range, output adjustable reference, high power efficiency, and low output noise. The device also includes numerous protective features such as over current protection, over voltage protection, thermal shutdown, and under voltage lock-out circuit which helps ensure reliable operation. Due to these features, the BD39012EFV-CE2 is an ideal choice for supplying power to industrial HIN systems.

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