ADP121-AUJZ15R7

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ADP121-AUJZ15R7 Application Field and Working Principle

ADP121-AUJZ15R7, classified as a PMIC (Power Management Integrated Circuit) and a linear voltage regulator, is an active circuit designed to regulate a specific output voltage to an exact value, sourced or sunk by a wide input/output differential voltage and constant or pulsating load current.

ADP121-AUJZ15R7 is an integrate low drop-out (LDO) linear regulator with an on-chip pass transistor, P-Channel MOSFET and on chip currentlimiting and thermal shutdown. This regulator and its variants offer load current from 100mA to 400mA, input voltage from 2.2V to 5.5V, and output voltage from 1.4V to 4.4V.

Application Field of ADP121-AUJZ15R7

ADP121-AUJZ15R7 has many applications. Generally, it can be used in consumer applications such as digital cameras, cell phones and MP3 players. Other than consumer applications, it can also be applied in medical and industrial applications, including medical diagnostic systems and medical instrumentation, as well as automotive and aerospace electronics.

Working Principle of ADP121-AUJZ15R7

The working principle of ADP121-AUJZ15R7 can be easily explained as follows. First, the input voltage of the device is applied to the pass transistor through a resistor. This resistor is designed to obstruct excess current flow. Secondly, the transistor amplifies the voltage so as to increase current greater than the resistor. In order to maintain a constant current, the control terminal of the transistor is directly connected to its output voltage. Thus, a feedback loop is created, with the loop seeking to maintain the output voltage near a given level by adjusting the current through the transistor.

The load current is then regulated by controlling the base-emitter current of the pass transistor. This is done by maintaining the voltage level of the control terminal at a predetermined level through the output voltage of the regulator. Therefore, the output voltage is maintained near its preset set point, and any changes in input voltage or load current lead to changes in pass transistor collector current.

In conclusion, ADP121-AUJZ15R7 provides stable output voltage levels over a wide range of input and output voltages and currents. This feature makes ADP121-AUJZ15R7 a valuable solution for many power management applications where precision regulation and high current loads are desired.

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