ADUM3070ARQZ-RL7

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ADUM3070ARQZ-RL7 application field and working principle

The ADUM3070ARQZ-RL7 device from Analog Devices Inc. (ADI) is a dual-channel, iCoupler® based, isolated DC-DC switching regulator. It is part of ADI’s PMIC (Power Management IC) Voltage Regulators product portfolio and performs the following functions: DC-DC conversion, regulation, tracking and protection, complementary function with its dual-channel design, and step-down topology (buck converter) using the MOSFET switching element.

The ADUM3070ARQZ-RL7 device integrates an iCoupler® digital isolator based controller to accurately sense and regulate output voltages across its two independent channels. This patented technology enables it to provide accurate digital control over voltage regulation without current flow through the primary side. The combination of the iCoupler technology and the high efficiency, low-voltage, dual N-MOSFETs allows it to operate over a wide temperature and voltage range, with high efficiency and low power dissipation.

The ADUM3070ARQZ-RL7 device provides a solution to a wide variety of isolation and high efficiency buck converters applications in Industrial, Automotive, and Communications applications. The device offers an input voltage range from 3.5V to 24V, a regulated output voltage of up to 15V, and an efficiency rating of up to 80%. The device integrates a variety of features to simplify design and improve reliability, such as current limit, soft-start circuitry, output voltage sense to detect overvoltage conditions, and thermal shut-down. The device also offers a unique combination of a self-clocked PWM controller and 4-bit digital user-addressable access control.

Application Field

The ADUM3070ARQZ-RL7 device is ideal for a variety of isolated DC-DC applications such as:

• Industrial applications: Distributed power systems, UPS systems, distributed power supply systems, motor drive and control systems, signal conditioning systems, data acquisition and control systems, and telecommunications.
• Automotive applications: Automotive body electronics, powertrain controllers, power supply modules, driver assistance technologies, audio systems, electric vehicles, and medical equipment.
• Communications applications: Wi-Fi and Long Term Evolution (LTE) modules, distributed antenna systems, and multi-band cellular systems.

Working Principle

The ADUM3070ARQZ-RL7 device is designed to operate as a dual-channel, switched mode, synchronous buck converter. It uses a combination of a single-ended pulse-width modulation (PWM) controller and two high efficiency, low-voltage N-MOSFETs to generate an isolated, low-voltage, regulated output from an unregulated input voltage. The device provides two independent output channels, each with its own PWM controller and N-MOSFET switch.

The internally generated PWM signal is used to regulate the output voltage. The PWM controller adjusts the duty cycle of the signal based on feedback from the output voltage sense pins. The duty cycle of the signal determines the conduction times of the two N-MOSFETs and therefore the output voltage of the converter. Increasing the duty cycle increases the output voltage and decreasing the duty cycle decreases the output voltage.

The ADUM3070ARQZ-RL7 device also includes two Digital Signal Processors (DSPs) to provide protection features such as overvoltage protection and thermal shutdown. The device also includes a self-clocked PWM controller and a 4-bit digital user-addressable access control.

In summary, the ADUM3070ARQZ-RL7 is an isolated DC-DC switching regulator with a dual-channel design and a step-down topology. It integrates an iCoupler® based controller to accurately sense and regulate output voltages across its two independent channels. The device operates with a wide input voltage range, is capable of accurately regulating output voltages of up to 15V, and offers high efficiency ratings of up to 80%. The combination of its high efficiency and low power dissipation make it an ideal solution for a variety of isolated DC-DC applications such as distributed power systems, automotive body electronics and communications systems.

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