LTC2965IDD#PBF

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Power Management Integrated Circuits (PMICs) are essential for devices to manage the power supply and maintain optimized data operations. Supervisors, one type of PMICs, are typically used to monitor voltage or current signals from system power supplies, track digital logic thresholds, and handle reset operations. A supervisor is effectively a type of comparator circuit, as it can compare and distinguish between two different signals.

Linear Technology Corporation (LTC) is one of the leading suppliers of digital power management solutions and Supervisors. The LTC2965IDD#PBF is an accurate, low-power micropower supervisor circuit with a reliable reset output, rated for an operating temperature range of -40°C to 85°C. It helps to monitor systems with 3.3 and 5V power supplies, as well as sequences external signals, identify voltage levels on power-up, and gives a reset signal, when required.

This supervisor also creates distributed power architectures by helping to regulate power supply sequencesto different system components. Its wide operating supply voltage ranges from 1.2V to 17V and input thresholds of 1.2V and 6V makes it a versatile solution for many applications.

General Application Field & Working Principle:

This LTC2965IDD#PBF Supervisors can be used in a variety of applications, including portable consumer electronics, industrial and automotive controls, as well asnetworking equipment and computing systems. It can be used as a reset supervisor for monitoring power supplies, and other applications like memory back up and safety monitoring.Because of its wide operating range, the LTC2965IDD#PBF can be used in many designs where the supply voltage range is beyond the typical power-management voltage range.

The working principle of the LTC2965IDD#PBF supervisor is very simple to understand. The LTC2965IDD#PBF monitors a single power supply voltage and outputs a RESET signal upon detecting a VOUT indication that is lower than the normal operating voltage. The RESET signal remains low as long as the monitored voltage remains below the pre-set threshold, which is adjustable by the user. The supervisor has four different levels of RESET output width, which is selected with the ON/OFF pin. The RESET pause time is adjustable by the user.

The LTC2965IDD#PBF supervisor also features a low power consumption of 2 μA, when in normal operation. This means that it doesn’t require an external power source. In addition, there is an AUTO-WAKEUP feature, which prevents the supervisor from resetting multiple times after the initial reset.

The LTC2965IDD#PBF supervisor also features a built-in watch-dog timer for time-out prevention. This time-out prevention can be used to prevent missed events or runaway code issues. The timing is adjustable, and up to 8.3 seconds of delay can be selected, before reset occurs. The supervisor also has additional hysteresis to prevent chattering, when the monitoring voltage is fluctuating.

Unlike the traditional supervisory circuits, the LTC2965IDD#PBF supervisor also has an active-low RESET output. This RESET output can be connected to an external interrupt controller, like TXB0106, without the need for an external pull-up resistor. This allows the user to easily configure the LTC2965IDD#PBF to generate interrupts when the monitored voltage falls below the pre-set threshold.

Overall, the LTC2965IDD#PBF Supervisor has very low quiescent current and wide operating voltage range allowing it to be used in many different applications. Its RESET output is active low and can be used together with an external interrupt controller to easily detect reset events. This makes it an ideal solution for microprocessor power-on reset and system low-voltage monitoring.

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