ADP2121ACBZ-2.3-R7

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The ADP2121ACBZ-2.3-R7 is an integrated, high performance, synchronous, switching step-down regulator with adjustable output current limit. It is specially designed for a wide range of applications such as PC/Server Power Supplies, LED Drivers, dc/dc converters, and high power application in automotive. This integrated, DC-to-DC regulator is particularly well-suited for source-side, high-current applications. It offers efficiency peaking at 96%, and its high output current of 4A allows it to deliver power at up to 12W over a 4.5V to 14V wide input voltage range.

Application Field

The ADP2121ACBZ-2.3-R7 is mainly used in PC/Server Power Supplies, LED Drivers, dc/dc converters, and high power application in automotive. This synchronous buck regulator is suitable for applications where very low output voltages (down to 0.75V) are required. It is able to deliver up to 4A output current and 12W power. Its high levels of efficiency and precision makes it particularly attractive for applications such as 5V memory core, 1.5V DDR memory, and low voltage microprocessor core applications.

The wide 4.5V-14V input voltage window allows the IC to be used in a wide range of applications. The adjustable output current limit allows it to prevent overloads and fault conditions from occurring. Additionally, the output voltage is adjustable by an external resistor divider.

Working Principle

The ADP2121ACBZ-2.3-R7 is a synchronous buck regulator. It uses two internal PMOS transistors for its switches. The PMOS switch connects to the sense lead. With the presence of an external voltage divider, the controller adjusts the internal loop reference to accurately regulate the output voltage.

When the output current is below the set threshold, the controller is in DCM (Discontinuous Conduction Mode). In this mode, the PMOS switch is on for a full cycle, then off for a full cycle, and repeating this pattern until the output current increases above the set threshold. Once this occurs, the PMOS switch starts to operate in CCM (Continuous Conduction Mode). In this mode, the PMOS switch is on for the majority of the time, and only completely off during the transitions. This maximizes efficiency and minimizes switch transitions.

Conclusion

The ADP2121ACBZ-2.3-R7 is an integrated, synchronous, single-output, step-down regulator with adjustable current limit. It is suitable for PC/Server Power Supplies, LED Drivers, dc/dc converters, and high power application in automotive. It offers an efficiency of up to 96% and an output current of 4A, allowing it to deliver power at up to 12W over a 4.5V to 14V wide input voltage range. Its wide input voltage window, adjustable output current limit and adjustable output voltage make it a great choice for a wide range of applications.

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