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PMIC - Supervisors

DS1818-10/T&R is a supervisor integrated circuit designed for protecting digital and analog applications from power system based faults. It controls the power up and power down sequencing of multiple power system rails in response to voltage and temperature of the application. Its output characteristics provide both fast and slow power up and power down for the application in order to achieve the best performance.

Application Field

DS1818 - 10/T&R is designed for applications requiring high reliability, such as automotive, telecommunications, industrial, medical and aerospace. It can also be used in consumer electronics, where a high degree of protection, precision and accuracy is needed. The device can be used as a general-purpose supervisor, or as a power management system for power control, thermal monitoring and tracking, protection and battery charging, etc.

Applications

The DS1818-10/T&R is used in a variety of applications, including power supply sequencing, power up and power down sequencing, monitoring power rails, and managing over-voltage and under-voltage states. It is also used in power systems for temperature sensing and close loop power control, battery power monitoring and charging, protection from over-current and under-current, brown-out detection, short-circuit/ground-fault protection, and as a watchdog timer and reset generator.

Working Principle

The DS1818-10/T&R Device is a single-channel voltage and temperature supervisor that can be used for multiple power-on and power-down sequences. The device is designed to provide protection from power faults, by monitoring both system voltage and temperature, and to provide the necessary conditions for immediate power up and power down of multiple rails in response to the user configuration. It has two comparator outputs, which can be used to set either rising or falling thresholds. When a voltage or temperature is outside of the threshold, an interrupt is triggered and additional control logic is activated. The device also includes an internal oscillator which sets the power up/down sequence speed.

The device can be used to protect systems from out of spec voltages (OV, UV) and temperatures (OT, UT), while providing the optimum stability and performance of the system. It can also be used to manage power sequencing, track the rail voltages and temperatures, and protect from over-voltage, under-voltage and field faults. It can also be used as a watchdog timer or a reset generator, providing a clean reset signal to the system.

Benefits

The DS1818-10/T&R Device is a compact and easy to use device, which provides high reliability and fast power up and power down sequences. It has an extended temperature range of -40°C to +125°C. Additionally, its internal oscillator allows variable speed power up and power down control, so that the application can achieve the best performance in terms of stability and protection from system faults. Furthermore, its voltage monitoring feature ensures excellent fault coverage and system performance, while its temperature sensing feature provides long-term reliability.

Conclusion

The DS1818-10/T&R Device is an integrated circuit supervisor designed for protecting digital and analog applications from power system based faults. It controls the power up and power down sequencing of multiple power system rails in response to voltage and temperature of the application. Its application field is wide, including automotive, telecommunications, industrial, medical, aerospace and consumer electronics. Its working principle is based on two comparator outputs, used to set rising or falling thresholds and an internal oscillator to set the power up/down sequence speed. The device provides several benefits such as fast power up and power down sequencing, high reliability, extended temperature range, variable speed power up and down, and excellent fault coverage and system performance.

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