ADP220ACBZ-2818R7

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The ADP220ACBZ-2818R7 is a member of the Linear Voltage Regulators PMIC (power management integrated circuit) family. This particular chip is a low dropout, precise, dual-output linear voltage regulator. It is designed to provide smooth and stable voltage for a wide variety of applications. This article will discuss the 3W, dual-output linear voltage regulator’s application fields and working principle.

Application Field

The ADP220ACBZ-2818R7’s wide input voltage range, low dropout and high accuracy of output voltage make it suitable for a wide range of applications. Its most common application field is providing power supply solutions in handheld electronic products and portable devices. Many of these require high voltage accuracy and low noise which this chip provides. It is also commonly used in automotive electronics and telecommunications equipment.

It is most frequently used as a part of a dual-voltage output solution, where the chip provides two separate and simultaneously adjustable voltage outputs. Its 3W total power output (1.5W per output) is suitable for many light-duty applications. The chip can also be used in fan speed control systems, where up to two fans are used and their speed controlled by clocks.

Working Principle

The working principle behind the ADP220ACBZ-2818R7 is rather simple. This chip features two parallel adjustable voltage regulators, often referred to as LDO (low dropout) or LDI (linear droop monitor detectors). These two regulators are then connected to an adjustable linear regulator, with the output being connected to the two outputs. The input voltage applied to the chip is equally distributed between the two LDOs and the linear regulator.

The chip uses the LP2950-3 voltage reference, commonly used in power management applications, to provide precise voltage regulation. This reference is driven by an external clock and is monitored by the LDOs and linear regulator. The adjustable linear regulator can then adjust the voltage output depending on the voltage reference’s value. This is then passed through the two LDOs and output to the chip’s outputs.

In addition, the chip also features overload protection and short circuit protection. This protects the chip from overloads or short circuits that may be present in the application circuit. The chip also features current feedback that ensures that the voltage output remains stable even when the load of the application changes.

Conclusion

The ADP220ACBZ-2818R7 is a 3W, dual-output linear voltage regulator that is suitable for many light-duty applications. It features two low dropout, precise, adjustable voltage regulators, which ensure that the voltage output is accurately and smoothly regulated. The chip’s wide input voltage range and low dropout make it suitable for use in many power supply solutions, while its current feedback and overload protection ensure that the circuit remains stable and secure. This makes it the perfect choice for many applications, from handheld electronic products to automotive electronics and fan speed control systems.

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