ADM805LARN

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ADM805LARN Application Field and Working Principle

The ADM805LARN is an innovative device by Analog Devices Inc. (ADI) and is an integrated device mainly used as either supervisor or reset circuits in AC/DC adapter/charger systems. The device is also applicable in applications where a simple low-cost power supply design is desired with low component count. As part of the ADI\'s DLPC (Dedicated Low Power Consumption) family, the ADM805LARN is optimized for robust, reliable performance with low power consumption and low operating current.

The ADM805LARN is a monolithic CMOS device which utilizes a low-power on-chip watch circuitry. When first powered up, this device enables power on reset (POR) for a desired timer period, generally utilized by most controllers. Then during the normal operation, this device continuously monitors the supply and reset voltage, and provides individual assertion as well as de-assertion outputs. These outputs may be used to control external circuits and provide necessary reset functionality towards various applications.

The ADM805LARN is a versatile device, which can be used for many different applications. It is primarily used in AC/DC adapter/charger systems, embedded controllers with boot manager and other devices. Additionally, the device can be used for voltage supervisor circuits in power supplies, switching power supplies, etc. As the device is designed for low-power operation, the operating current during monitoring is really low which enables seamless powering of the end device with better energy management.

The device can be adapted to various systems based on various parameters and configurations of the design by the user. The main parameters and functions that can be configured include input voltage, reset voltage, device trip/reset voltages, hysteresis levels, start-up timing, and more. The device offers a wide range of adjustable features that can be tailored to suit various applications.

In terms of working principle, the device uses a voltage monitor coupled with an oscillator to detect and monitor the supply or output voltage. Whenever the supply voltage is within the input voltage range, the device enables the oscillator oscillate between preset trip and reset voltage levels. Once the voltage level falls outside this range, the device resets the oscillator. Once the device detects no trip or reset events for the defined period, it then initiates the reset sequence.

The ADM805LARN is designed as a hybrid reset circuit providing both pulse and maintained reset. The pulse reset output provides an active low signal when the reset voltage is crossed, while the UP1CHC output provides a push-pull output which is either asserted high or low, depending on whether the voltage is within range or not. This output is generally used to directly control external circuitry.

Therefore, the ADM805LARN provides a wide range of features and functionalities that can be used to provide robust and reliable power supply designs. Its adjustable features, flexibility and low power consumption makes it an ideal choice for various applications.

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