MAX820LESE+

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Power management integrated circuit (PMIC) is one of the important chip components in embedded system. PMIC - Supervisors are used to monitor and protect the power system stability and safety. MAXIM\'s MAX820LESE+ is a low dropout cmos supervisory circuit that provides an economical solution for power management requirements. The application field and working principle of MAX820LESE+ will be described below.

The application fields of MAX820LESE+ Supervisors include the monitoring of voltage, current and temperature supplies in embedded systems. It is suitable for a wide range of applications such as embedded control boards, system on chips (SoCs), mobile baseband units and other mobile equipment. It is designed to operate from a single supply voltage from 1.2V to 5.0V. MAX820LESE+ also features an active-low device-lock output and reset delay, enabling it to be used in essential-power-rail interconnects and high voltage batteries.

As for the working principle, MAX820LESE+ Supervisors utilize a VDD-generated supply voltage threshold to drive a low-voltage output. An internal reference voltage is used to drive the threshold voltage and establish a predictable voltage window. The thresholds are set to execute a reset-low when the voltage drops below the preset reset-low threshold, and reset-high when the voltage returns to the preset reset-high threshold. When the voltage drops below the reset-low threshold, the output will be driven low, thus ensuring that the power system is stable and safe.

MAX820LESE+ also features a two-state input threshold capability that allows for a "low output trip" and a "high output trip". The low output trip pin can be set to assert a reset-low on over-voltage detection and the high output trip pin can be set to assert a reset-high on over-voltage detection. When triggered, both output trips can operate independently from the main reset threshold. Thus, MAX820LESE+ provides an efficient solution for power management applications that require low-current, low-voltage reset solutions.

In addition, MAX820LESE+ also has a variety configurations and features an adjustable reset time-out delay, which is particularly useful for suppressing false reset signals caused by power system glitches. This reset time-out delay, along with its other features, allows designers to configure a powerful and reliable reset circuit suited for their application, be it embedded control boards, SoCs, mobile baseband units or other mobile equipment.

In conclusion, MAX820LESE+ Supervisors is an excellent solution for efficient, low-current, low-voltage power management in many embedded systems. It provides reliable and cost-effective monitoring of voltage, current and temperature supplies, and is suitable for a wide range of applications. With its adjustable reset time-out delay, adjustable preset reset-low and reset-high thresholds, and two-state input threshold capability, MAX820LESE+ ensures an efficient and reliable reset circuit suitable for any embedded system.

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