SP708CN-L/TR

Power management integrated circuit (PMIC) is a component device used in most of today’s embedded designs, be it analog, digital, or mixed-signal. A PMIC helps manage multiple voltage rails and can protect against bad dc input power. The use of PMICs spans markets such as transportation, consumer electronics, industrial, automotive, communications, computing, and medical.

Supervisors are an important class of PMICs, designed to help protect integrated circuits from poor operating conditions that could cause damage. The SP708CN-L/TR is one example of a supervisor for protecting systems from over-voltage or under-voltage conditions.

SP708CN-L/TR Application Field

The SP708CN-L/TR is applicable to power supplies in various types of electronic equipment, such as PCs, mobile phones, peripherals and medical equipment, etc. It can protect against over-voltages greater than the input voltage by protecting the voltage regulator’s output.

The over-voltage protection provided by the SP708CN-L/TR works by continuously comparing the instantaneous output voltage to the nominal value, and limiting the output voltage to a safe level when the voltage exceeds a predetermined point. The over-voltage protection works both in case of normal input voltage and in case of an abnormal input voltage.

In addition to the over-voltage protection, the SP708CN-L/TR offers under-voltage protection. This can protect against scenarios such as a sudden loss of power or if the voltage drops below the operating voltage threshold that the system requires to function.

SP708CN-L/TR Working Principle

The SP708CN-L/TR is a high precision supervisor with adjustable over-voltage (OV) and under-voltage (UV) detection levels. It can detect changes in voltage levels, both in terms of increase and decrease, and is accurate to within the range of ±2% of the nominal value.

When an excessive voltage is detected, the SP708CN-L/TR triggers the output interrupt (OVF). This interrupt must be reset to high by an external reset circuit to continue normal operation.

The voltage detection thresholds, OV and UV, can be programmed by connecting the desired voltage to the OV and UV pins. For the OV function, the output of the device will be held low after the set threshold is exceeded. Similarly, for the UV function, the output of the device will be held low after the set threshold is reached.

The SP708CN-L/TR also has a built-in hysteresis of ±3% around its output voltage thresholds, preventing it from being ‘latched’ in an incorrect operating state.

Conclusion

The SP708CN-L/TR is an effective supervisor for protecting circuitry from over-voltage and under-voltage conditions. It is used in a wide range of electronic equipment, from PCs and mobile phones to medical equipment, and works by continuously monitoring the voltage levels, triggering an external reset circuit when the voltage exceeds a predetermined point.

The adjustable OV and UV thresholds, as well as the built-in hysteresis, make the SP708CN-L/TR an effective and reliable device for a wide range of operating conditions.