MAX6408BS22+T

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Power management integrated circuits (PMICs) are system-level devices employed in a variety of different applications. Amongst these many PMICs, supervisors provide a level of reliability and safety to a circuit by performing certain protection and monitoring functions. Products that are part of this application field include the MAX6408BS22+T supervisor. This article will discuss the MAX6408BS22+T supervisor in brief and how it works within its application field.The MAX6408BS22+T is a supervisor which provides accurate system power on initial power-up and Brown-Out Detection (BOD) for advanced power supply protection. It monitors a single power-supply voltage such as 3.3V, 5.0V, and 12V and features protections for shorts, overvoltages, and reverse voltage conditions. The MAX6408BS22+T also features undervoltage detect and reset thresholds in addition to the overvoltage detect and latch. To help detect power failures, the device has an ultra-low 0.7V threshold voltage, enabling the supervisor to quickly detect problems in the power supply.On the output side, the MAX6408BS22+T supervisor has an active-low reset output as well as an active-low set/enable output. The reset output can be configured in a number of ways and is extremely useful in preventing inaccurate calculations in digital systems while the set/enable output is designed to give circuits the appropriate power in order to function correctly. In order to accomplish this, the MAX6408BS22+T includes a process monitor which uses a voltage monitoring sequence that begins as soon as the supervisor is energized.In operation, the process monitor first verifies that the monitored voltage starts above the preset undervoltage detect threshold then checks that the voltage remains above the preset voltage (e.g. 3.3V) and the undervoltage detect threshold during the VDD Monitor Time. If the voltage should drop below either of the two values, the supervisor will issue an active-low reset output. The voltage level is constantly monitored and if the voltage has not recovered to its predetermined level within the set reset timeout, the supervisor will issue a reset. The reset will then be issued after a second power-on delay has elapsed in order to allow any part of the circuit which needs additional settling time to do so.The MAX6408BS22+T also provides a wide range of overvoltage or latch options in order to provide the system with accurate power monitoring. The latch feature is able to detect overvoltage conditions and will keep the reset output under the active low condition until manually reset. This redundant protection mechanism helps ensure that all components of the system are given adequate power and that no damage is done due to unsafe voltage levels.In addition to the over- and undervoltage detection, the MAX6408BS22+T offers an input voltage range of 4.5V to 18V as well as reverse voltage protection to guard against mis-trapping power. This reverse voltage protection is also offered for all of the pins of the device, providing a level of protection against external faults or misconnections.To sum up, the MAX6408BS22+T supervisor is a reliable and versatile monitoring device that provides a variety of protection and monitoring features to the system which it is employed within. It is capable of monitoring a single voltage source and provides both over- and undervoltage protection as well as latch and active low reset outputs. The MAX6408BS22+T also boasts a wide input voltage range and reverse voltage protection to reduce the risk of damage due to external faults or misconnections.

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