BD90521EFV-CE2

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The BD90521EFV-CE2 is a constant voltage DC-DC switching regulator from a series of low power switchers offered by ROHM Semiconductor. It is a member of the PMIC (Power Management ICs) family, specifically designed for DC-DC voltage regulation and is categorized as part of the Voltage Regulators - DC DC Switching Regulators grouping.

The BD90521EFV-CE2 offers step-down (Buck) operation with output currents up to 200mA, and is able to work with input voltages of up to 8V and output voltage ranging from 0.8 to 5.5V. It features a maximum output current of 200mA, as well as a very low quiescent current of 2.6μA in shutdown, making it suitable for portable applications. Other features include a wide operating temperature range up to 105 Celsius, a very short soft start time of only 60μs, cycle-by-cycle current limit protection and the option of external peak current control.

The BD90521EFV-CE2 can answer to a wide range of applications. As an example, it can be used in battery operated, energy efficient systems for energy harvesting, metering, and monitoring systems, as well as for powering small to medium sized loads. Its wide operating temperature range and low quiescent current also makes it suitable for automotive applications.

The BD90521EFV-CE2 operates by switching the input voltage according to the output voltage, either in its PWM or Pulse Frequency Modulation (PFM) control mode while providing a constant voltage output. It has a built-in hysteretic control loop, which allows it to explore its cycle-by-cycle current limit and adjust its switching periods according to the condition, thus enabling it to reach the optimal output voltage. External resistance can be used to fine tune the accuracy of the current limit and peak current control for more precise output.

In conclusion, the BD90521EFV-CE2 is an ideal voltage regulator for low current work with a wide operating temperature range and a low quiescent current ideal for battery operated systems and automotive applications. It also has cycle-by-cycle current limit and peak current control through external resistance, making it versatile and easy to work with.

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