ADM705AR

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

PMIC (power management integrated circuit) is an important part of any power control design. They manage and regulate power to ensure proper system performance. PMICs can be categorized in to Supervisors, buck regulators, linear regulators, and buck-boost regulators. Supervisors are used for system protection and for redefining power management. In this article, we will focus on ADM705AR, a supervisor from Analog Devices, and its application field and working principle.

The ADM705AR Series are CMOS voltage supervisors with an open-drain reset output. It offers an active-low reset output and assures correct startup of the microcontroller or microprocessor. It has a reported operating temperature range of -40 °C to +125 °C. It can monitor systems with 1.8V to 5.5V power levels, and 1.2V to 5.5V reset threshold window. The reset delay can be programmed using an external capacitor. It also has an active-low power-good (PG) output, which is controlled by the reset threshold voltage.

The ADM705AR is mainly used in industrial, automotive, and consumer applications. In industrial automation and management systems, the voltage supervisor can sense and provide protection against power outages and provide power supply integrity. For communication systems, the ADM705AR can monitor and provide safe reset for devices such as FTU, DSL, L2TP, etc. In the automotive environment, this device can provide protection against any system inrush, overvoltage, and overcurrent. It can also be used to monitor current in devices such as power inverters and motor control.

The ADM705AR has two main functions: providing reset to the microcontroller or microprocessor, and providing power supply integrity through the power-good output. This can be accomplished through its two main blocks, the voltage and current sensing block, and the reset logic block. The voltage sensing block detects the input voltage and passes it to the reset logic block. The reset logic block compares the input voltage to the programmed threshold and sets the reset output if it falls below the threshold. The power-good output is controlled by the reset threshold voltage and is used to indicate that power supply is within the predetermined range.

The ADM705AR uses a voltage reference together with a voltage divider and a resistor for setting the reset threshold. The voltage reference is set to a default voltage and can be changed with an external resistor. The voltage divider, composed of PMOS and NMOS transistors, sets the reset threshold in reference to the voltage reference. The resistor is used to scale the voltage divider’s output voltage according to the desired sensitivity. A capacitor is also used to delay the reset pulse so that it will not be active when power is first applied.

In summary, the ADM705AR is a voltage supervisor widely used in industrial, automotive, and consumer applications. It provides system protection by monitoring the power supply and providing a reset output when the voltage level drops below the programmed threshold. It includes a reset logic block and a voltage sensing block with a voltage reference, voltage divider, and a resistor for setting the reset threshold. This device is also equipped with a power-good output for power supply integrity.

The specific data is subject to PDF, and the above content is for reference