MAX6720UTVHD3+T

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Based on its generic features, a supervisory circuit is a monitor of power supply and system reset function. The MAX6720UTVHD3+T, a long-term supply voltage monitor and a low pin-count reset IC in the supervisory family of MAXIM Integrated, serves as the best example of a supervisory circuit.

Specifically, the MAX6720UTVHD3+T is a low-voltage supervisory IC that monitors a single supply voltage and provides reset signal. It features an internal voltage reference, accuracy monitor, and an adjustable window comparator to guarantee a high-accuracy supervisor over a wide voltage range. It comes with a small, 8-pin TypeT SOT-23 package that is best suited for space and low pin-count applications.

The MAX6720UTVHD3+T has two distinct applications -- (1) a low-power supervisor and (2) a mobile power supply supervisor. As a low-power supervisor, it controls standby-supply systems with a wide output voltage range from 1.3V to 15V. With its 11.3V ±1.3% accuracy reference, it provides accurate monitoring of low voltages. On the other hand, in mobile BCM applications, it used to monitor the back-up battery voltage and provide a reset signal to shutdown the system when the back-up battery is disconnected or when the main power fails.

Available in the commercial, industrial and automotive temperature ranges, the MAX6720UTVHD3+T provides a reset timeout of 4.1ms to 25.5s, adjustable through an external capacitor. It also features a 2.6V to 8.2V input voltage range and an up to 6mA detection current. Moreover, the reset pulse width can be adjusted from 10µs to 800µs through an external resistor.

The working principle of the MAX6720UTVHD3+T is based on the window comparator that compares the power-supply voltage to the fixed upper and lower voltage thresholds, VddtH and VddtL. When an input voltage VIN falls below VddtL or rises above VddtH, the RESET output goes active. Likewise, once VIN returns within the window voltage interval VddtH and VddtL, the RESET output goes inactive. The window voltage cadence, Vwdc, is defined as the following equation: Vwdc = VddtH - VddtL. In addition, it also features an internal voltage amplifier and a control logic circuit that controls the output RESET signal.

The supervisory circuit MAX6720UTVHD3+T offers precision voltage monitoring with integrated reset timeout facilities and a thermal-shutdown circuit. It is a cost-effective and high-precision solution for a variety of battery-charging, communication, and low-power mobile applications. Thus, it helps system designers optimize their designs while ensuring accuracy and reliability.

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