ADM7172ACPZ-4.2-R7

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ADM7172ACPZ-4.2-R7 Application Field and Working Principle

ADM7172ACPZ-4.2-R7, from ADM (Analog Devices, Inc.), is a 4.2V low-dropout (LDO) linear voltage regulator. This product belongs to PMIC (Power Management ICs) category and Voltage Regulators – Linear subcategory. It is specified for a 0.3V (at 100mA) dropout voltage and a maximum output current of 100mA.

This device is widely and usually used on systems with low-power consumption. ADM7172ACPZ-4.2-R7 is especially designed for applications requiring high accuracy voltage. This is possible because of its high precision in the output voltage, with an accuracy over temperature range within 0.8%. The ADM7172ACPZ-4.2-R7 also provides improved long-term stability and rated voltage tolerance.

Overview:

• Input Voltage Range: 1.5V to 8.0V
• Output Voltage: 4.2V
• Precision Accuracy over temperature range: 0.8%
• Maximum Quiescent Current: 3.2mA
• Maximum Output Current : 100mA
• Dropout Voltage: 0.3V (at 100mA)
• Temperature Range: -40°C to +125°C
• Extended Short-Circuit Protection

Applications:

• Portable Communications
• Computer peripherals
• Consumer Electronics
• High Power Handheld Devices
• Automotive Control
• Instrumentation

Working Principle

The ADM7172ACPZ-4.2-R7 is a three-terminal linear voltage regulator. Its main function is to provide an output voltage that is higher than the input voltage. The input voltage is derived from a suitable power supply line and it is regulated by an active element, usually a transistor. This active element is usually driven by a control element on the basis of a reference voltage.

The voltage control element (VCE) controls the output voltage of the regulator by regulating the current that flows through the active element. The control element uses its own reference voltage to compare the output of the regulator against the reference voltage. If the output of the regulator is higher than the reference voltage, the control element turns off the active element; if the output of the regulator is lower than the reference voltage, the control element turns on the active element.

The output voltage of the regulator is monitored by a feedback connection to the voltage control element. This feedback connection ensures that the output voltage of the regulator is maintained at the desired reference level. If required, resistors are inserted in the feedback path to change the gain of the control element so that the output voltage can be adjusted to the optimum level.

The ADM7172ACPZ-4.2-R7 also has additional features such as short circuit protection and thermal shutdown protection. The short circuit protection will shut down the active element when the output voltage exceeds the reference voltage, by preventing the output from sourcing excessive current. The thermal shutdown protection will shut down the device if the junction temperature of the active element gets too high.

Conclusion

ADM7172ACPZ-4.2-R7 is a 4.2V low-dropout (LDO) linear voltage regulator, belongs to PMIC (Power Management ICs) category and Voltage Regulators – Linear subcategory. This device is widely used on systems with low-power consumption, especially when high accuracy voltage is required. It provides improved long-term stability and rated voltage tolerance, as well as features such as short circuit protection and thermal shutdown protection.

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