X40421S14I-B

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The X40421S14I-B is a type of voltage supervisor integrated circuit typically used as a reset IC in power manage ICs (PMICs) applications. Voltage supervisors are used for monitoring an integrated circuit (IC) or system power supply to prevent the IC or system from operating with incorrect voltages and currents. The main function of a voltage supervisor is to ensure that the power supply voltage meets the required logic level of the IC or system.

The X40421S14I-B integrates wide-range of features, such as an over voltage under voltage detector, built-in delay control circuit, and window detector. The IC also features a Voltage-Locked-Loop (VLL) output, which provides an accurate and stable voltage reference for system reset management. The over voltage detector monitors the input supply voltage and sets an internal flag when the voltage rises above a predetermined threshold. The under voltage detector will monitor the input supply voltage for an undesired decrease. If the voltage level drops below a predetermined level, an internal flag will be set. When an internal flag is set, an output signal is generated and the reset signal will be asserted.

The X40421S14I-B includes a reset delay circuit, which includes a voltage-controlled runaway circuit, an oscillator and a timer. The voltage-controlled runaway circuit is triggered when the reset signal is asserted and will control the charging process of an external capacitance. The charging voltage of the capacitor is monitored, and the oscillator will start counting after the capacitor is charged to a pre-defined voltage level.

If the capacitor is not charged before the count is finished, the timer will generate an active reset signal. The reset signal will remain active until the capacitor is charged. The window detector monitors the input voltage and sets an internal flag when the voltage drops below a certain threshold. The window detector can also be used as a voltage monitor for other systems if required.

The X40421S14I-B features a long operating temperature range of -40°C to +125°C, and is offered in small size 5.2mm x 3.2mm WQFN package. The maximum supply voltage is 5.5V and the supply current is 10µA. Furthermore, the X40421S14I-B can be used in battery powered systems with very low supply current.

In summation, the X40421S14I-B can be used in a wide variety of PMIC - Supervisors applications, such as reset and monitoring functions on voltage, current and fan speeds, as well as in battery operated, temperature and window monitored systems. The X40421S14I-B offers a wide temperature range, a low supply current and a small package size, making it ideal for portable applications.

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