MAX820SCSE+

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PMIC (Power Management Integrated Circuit) Supervisors are designed to monitor certain power supply conditions in consumer electronics, computing, and industrial applications. Common features of these circuits include under/overvoltage detection, reverse supply protection, and power sequencing. The MAX820SCSE+ is a high-performance CMOS supervisor IC used for monitoring and protection of 3.0V to 5.5V DC supply voltages. It offers superior accuracy, low current consumption, and versatile triggering thresholds, and is thus able to provide reliable and repeatable power supply status during system boot and normal operation.

The MAX820SCSE+ is an 8-lead, small-outline (SOIC) package with an additional exposed pad for improved thermal dissipation. It operates over a wide temperature range (-40°C to +85°C) and is time-delay programmable with a built-in pull-up and pull-down transistor network. The device is designed to monitor the power supply of 3.0V to 5.5V systems, with a threshold voltage setting (VON) of 1.20V ±0.05V, and a delay time range of 0.2ms to 1.2s.

The MAX820SCSE+ is composed of three primary components: a reference voltage generator, a comparator, and a power-on reset generator. The voltage reference generator produces a stable and accurate reference voltage that is used by the comparator to compare the external supply voltage to a predetermined threshold voltage. When the voltage drops below the threshold, a reset signal is generated and sent to the power-on reset generator. The reset generator then latches a power-on reset to ensure that all other components of the system properly initialize.

The MAX820SCSE+ features a no-load reset detection circuit, which uses an internal comparator to detect the presence of an external pull-down resistor between the power and ground pins. If the resistor is detected, the reset signal will be delayed until the pull-down resistor is removed. This feature is ideal for systems operating with an external supervisor to provide fail-safe reset protection.

The MAX820SCSE+ also includes an open drain reset output, which is pulled low to indicate an active reset. This signal can be used to reset other components in the system, such as microcontrollers, RAM, and flash memory. Additionally, the device includes a power-good signal (PGOOD), which is pulled low when the power is out of specification. This signal can be used to indicate to other components in the system that the power supply is not operating correctly, and can trigger an alarm or shut down the system.

The MAX820SCSE+ is designed to meet a variety of application requirements and is able to provide reliable power supply system protection with low current consumption and no external components required. This ensures that portable, low-cost systems are able to benefit from its features and take advantage of the power savings and reliability that it provides. The device is perfect for a wide range of applications, including consumer electronics, computing, and industrial applications.

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