BD9859EFJ-E2

The BD9859EFJ-E2 is a voltage regulator device in the family of DC-DC switching regulator controllers. It is applicable to many types of DC-DC converter topologies, such as buck, boost, buck-boost and SEPIC. This integrated circuit (IC) is an ideal solution for power management in low to medium power applications, including industrial, automatic control, consumer, PC and portable device applications.

The BD9859EFJ-E2 is designed to operate in a wide range of input voltages from 3.5 V to 28 V, provides adjustable output voltage with a range from 0.88 V to VIN. It contains a high-efficiency, dual-channel-integrated step-up DC-DC converter, which reduces the number of external components. In addition, the output voltage is adjustable by an external resistor divider.

The BD9859EFJ-E2 integrates both a full bridge driver and a high-side P-channel MOSFET for reverse current prevention, which increases system performance. An integrated output current sensing circuit with resistor enables the setting of the current limit by varying the type of the external resistor. It also contains a precisevoltage reference, a high-precision current sense amplifier, and a built-in overload protection circuit to protect the system from overload.

The BD9859EFJ-E2 has a variety of operating modes and features that can be used for flexibility and ease of use, such as Burst Mode operation, soft start, current limit, over-temperature protection, dynamic voltage scaling, as well as frequency synchronization. Those features make it suitable for applications that require high performance, stability, and flexibility.

In general, its working principle is based on the control of the converter switching effect, which is did by the converter control circuit. When the input voltage is applied, the controller will monitor the input and output voltage, and then adjust the switching frequency to achieve a particular output voltage. The converter control circuit will also monitor the output current, and when the current limit of the output is reached, the controller will reduce the switching frequency accordingly.

The BD9859EFJ-E2 is an ideal choice for a wide range of DC-DC switched converter applications that require high performance, stable operation and flexibility. Its broad range of features and functionality combined with a simplified design process makes it especially well-suited for industrial, automotive, and consumer applications.