MAX6854UK18D3+T

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The MAX6854UK18D3+T is a supervisor device specifically designed to monitor power tree voltages in integrated circuit families. The device is a combined temperature supervision and power-on reset circuitry. It provides both overtemperature monitoring with an open-drain or an open-collector output, as well as power-on reset signaling with a dual reset output. The supervisor provides reset threshold accuracy across temperature and voltage input ranges, as well as a wide selection of reset threshold and reset active times.

The MAX6854UK18D3+T monitors the input voltage Vdd and provides a corresponding active low push-pull output, RESET. Gated reset is independently available for inrush current avoidance with the OPEN gate output. The device also monitors for overtemperature via the TEMP output, and also allows for trimming of both the reset and overtemperature thresholds and active times. The open-drain or open-collector overtemperature output (TEMP) indicates that the device has reached an overtemperature shutdown level.

Typical Applications of the MAX6854UK18D3+T include portable electronic devices, such as digital cameras, PDAs, notebooks, MP3 players, and medical and automotive applications. The device is also suitable for use in automotive and industrial electronic equipment.

Working Principle of the MAX6854UK18D3+T is based on the supervisory principle which, when applied to switchmode power supplies, provides two main functions. First, it monitors the output voltage level to detect when it has gone outside its tolerance; in this situation, it immediately shuts down the supply by activating an output gated reset or an open-drain reset line. Second, it constantly checks the temperature of the system, and shuts down the supply if it exceeds a certain threshold.

In addition, the MAX6854UK18D3+T features two reset outputs: the OPEN line, which is a gated output that allows inrush current control, and the RESET line, which is an open-drain or open-collector output. The device provides precise reset threshold accuracy across temperature and voltage input ranges, and offers a wide selection of reset threshold and reset active times.

The device has user-programmable settings that allow the user to select their own reset thresholds, offering both slope and level reset settings. The reset settings are stored in the device’s static RAM, allowing it to be programmed and stored even when powered off. The device also features an overtemperature reset feature that allows it to shut down the power supply if the temperature exceeds a pre-programmed threshold.

The device further features an internal 2.4-V reference voltage, an analog ground pin, and a wide supply voltage range, which makes it suitable for a range of applications. In addition, the device can be easily integrated into a wide variety of systems, and features a low standby current consumption and robust ESD and surge protection.

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