MAX6762TAZID0+T

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PMIC - Supervisors: MAX6762TAZID0+T Application Field and Working Principle

The MAX6762TAZID0+T main application field is in the PMIC - supervisors, which supports a wide variety of input voltage options and offer an easy way of selection of the desired voltage thresholds. Its target applications include all sorts of electro-mechanical and communication equipment, like mobiles, computer peripherals, and power adapters. The MAX6762TAZID0+T is a member of the MAX6762 ultra low-power voltage-supervisor family, providing the user with on-chip reset replacement, protection, and reset timing control.

The MAX6762TAZID0+T possesses a wide range of input voltage options from a range of operating temperature from -260 C to + 85 C, as well as lack of level-shift circuitry, low-power operation, and a wide range of undervoltage and overvoltage detection thresholds. It is also designed with a low-skew delay-lock loop (DLL) for reset output timing control and a patented internal delay schedule. Unlike other voltage supervisors, it does not require external components for delay aiming control, reduces component count, and decreases layout complexity and cost.

Working Principle

The MAX6762TAZID0+T provides a wide selection of output triggers with different input voltage levels, adjustable reset-timeout time, and selectable POR generating frequency. When the input voltage is too low or too high, the MAX6762TAZID0+T will issue a reset signal to the system, indicating the user needs to take steps to reset the system. It is limited to a single Reset pulse when a fault conditions is detected, after the power-on reset. The MAX6762TAZID0+T monitors the system power supply and ensures continuous activity of powered systems by providing an accurate power management.

The core of the MAX6762TAZID0+T is the voltage supervisor, which senses the power supply voltage using an open-drain comparator with internal hysteresis. It uses an integrated resistor to set the trip threshold value. It provides an active-low push-pull reset output that is driven low by a small current source when the voltage threshold is exceeded. The voltage source needs to meet the Reset valid time specified in the data sheet.

The MAX6762TAZID0+T contains a power-on reset circuit, which is activated when the power supply cross the trip points. When the power supply reaches the specified level, the power-on reset will be triggered to generate a single active-low Reset pulse. The MAX6762TAZID0+T can also be used for supervisory functions in system initialization. It can store the status of the power up/down events, or other system dependencies, and provide additional protection from over-voltage and surges.

The MAX6762TAZID0+T has an integrated adjustable delay-lock loop (DLL) to provide the user with protection and reset timing control. This on-chip DLL helps prevent spurious reset signals due to short-term voltage fluctuations and provides a more reliable system power-on reset sequence. Depending on the application, the length of the delay can be adjusted by modifying the feedback resistor values, allowing the user to set the timing according to the system requirements.

Conclusion

The MAX6762TAZID0+T is a powerful and advanced voltage supervisor suitable for a wide range of applications. It offers low power consumption, requires no external components for delay aiming control, and is designed for wide temperature operation and wide undervoltage and overvoltage detection thresholds. Additionally, the user can use the on-chip DLL to set delay times and the integrated resistors help to set the trip thresholds.

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