ADP122AUJZ-3.0-R7 Integrated Circuits (ICs)

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ADP122AUJZ-3.0-R7 application field and working principle

The ADP122AUJZ-3.0-R7 is a high-performance linear voltage regulator specifically designed to provide a cost-effective, low-stress solution for advanced analog and digital power management applications. It features a wide input voltage range, excellent line and load transient characteristics, and an optimized guard-ring diode protection circuit for reverse protection.

The ADP122AUJZ-3.0-R7 is a low-dropout linear voltage regulator that provides a precisely regulated voltage output (LVOUT) of 3 V with a typical dropout voltage of 100 mV at a current of 200 mA, and maximum output current of 1 A. The standard output tolerance is ±3%. The input voltage range is from 2.3 V up to 6.0 V. The device is designed to be highly efficient with minimal power dissipation in all operating conditions. The device is capable of operating with a 0.4 μA (typical) shutdown current.

The ADP122AUJZ-3.0-R7 is ideal for use in mobile devices and other applications where space is a premium. The device is packaged in a small 1 mm × 1.5 mm 8-lead LFCSP package with 1 mm pitch. The low profile package provides protection against damage due to mishandling and elevated temperatures. The device also features a wide operating temperature range of –40°C to 125°C.

Working Principle

The ADP122AUJZ-3.0-R7 is a three-terminal Linear Voltage Regulator (LVR). It provides an output voltage of 3.0V with a maximum output current of 1.0A. The device has input voltage and output voltage ranges, an internal power transistor and control circuit. It operates on a feedback loop, with the input voltage connected to the input and the output voltage connected to the output. The voltage reference is internally connected to the error amplifier through the feedback loop.

When the load is connected to the output, the negative feedback loop will keep the output voltage constant regardless of the load current. The output voltage is adjusted by the error amplifier. If the error amplifier detects that the output voltage is higher than the reference voltage, the error amplifier will reset the output transistor to decrease the output voltage; If the output voltage is lower than the reference voltage, the error amplifier will reset the output transistor to increase the output voltage.

The device also includes several other features like over current protection, thermal shutdown protection, class H output filtering, low quiescent current, improved thermal resistance and a low dropout voltage. The device also includes a guardring diode that provides reverse protection against negative transients.

Applications

The ADP122AUJZ-3.0-R7 is designed for low-dropout applications where extremely low power consumption is a requirement. It is suitable for mobile devices including smart phones, mp3 players and digital audio recorders, portable medical devices, portable gaming devices and other handhelds, as well as for various low-power applications where size and low power consumption are essential.

The device is also suitable for use in battery powered system such as notebook PCs and other battery powered portable systems where extended battery life is critical. The ADP122AUJZ-3.0-R7 can also be used in automotive applications such as automotive infotainment systems, audio and video systems, and lighting systems.

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