S-80838CNNB-B8XT2U

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PMICs (Power Management Integrated Circuits) are a critical component of most consumer electronics, offering capability of properly managing power supply and system performance. Among these PMICs, supervisors, such as the S-80838CNNB-B8XT2U, are key devices used for system reset and power controller.This article explains the application field and working principle of S-80838CNNB-B8XT2U, a supervisor used to safeguard electronic systems from malfunction in power and reset.

The S-80838CNNB-B8XT2U is ideal for protecting single-channel mobile applications such as in-vehicle infotainment systems, GPS navigation systems, and small home appliances. Its application field covers a wide range of products, from receivers and industrial control systems to battery charging systems and medical product applications. Generally, the supervisor is used when the system power is greater than 1.8V (up to 3.6V). To ensure system reliability and accuracy, it is also recommended that board designers select an appropriate power-on reset voltage level.

The working principle of S-80838CNNB-B8XT2U is based on the principle of threshold sensing. It incorporates two comparators with a threshold voltage input (VTH) and a reference voltage input (VREF). Two independent reset outputs (VRESET1 and VRESET2) are available, one with internal pull up (active high) and the other one with internal pull down (active low) configuration. The device monitors the power supply for an under-voltage condition, triggered by a hysteresis comparator. When an under-voltage condition occurs the fault reset output becomes active for a fixed delay delay time and will remain active until the hysteresis comparator input is greater than VREF.

In addition to under-voltage detection, the S-80838CNNB-B8XT2U provides a PPOR (Power On Reset) functionality. The PPOR functionality is based on a reference voltage that is adjustable up to a maximum of 4V. When the power supply voltage rises above the selected threshold voltage the PPOR is triggered and the reset output becomes active. It is important to note that the PPOR function is triggered irrespective of the state of the UVLO detection circuit. This provides an additional level of safety for single cell power supply applications, preventing systems from entering a state where the power supply voltage is below the minimum operating voltage but no reset signal is generated.

The S-80838CNNB-B8XT2U features an input voltage range of 1.8V to 3.6V and a power supply current of 6 μA (at 3.6V). It has a fixed reset delay of 300 ms, a 25μs hardware reset delay and a 100μs hardware pulse width. It is also equipped with both a multi-function push button input and an external reset input. Furthermore, the supervisor is RoHS-compliant, has Pb-free lead plating, and a halogen-free packaging.

The S-80838CNNB-B8XT2U supervisor, with its wide input range, low power consumption, multiple inputs, and adjustable reset voltage, is ideal for a wide range of applications, from receivers and industrial control systems to battery charging systems, in-vehicle infotainment systems, GPS navigation systems, and medical product applications. Its combination of under-voltage and power-on reset protection ensures reliable operation of electronic systems, reducing the risk of malfunction due to unstable power supply or reset failures.

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