MAX6855UK39D4+T

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The MAX6855UK39D4+T Supervisor is a highly integrated, high-accuracy supervisor specifically designed to monitor several system parameters, including system voltage, power-on reset (POR), watchdog timer (WDT), system temperature, and supply current or total system power. It is intended for the application of power management in multiple electronic systems within the industrial and automotive markets. With its enhanced accuracy, integrated temperature sensing with 8-bit A/D conversion and low quiescent current, the MAX6855UK39D4+T can greatly improve the reliability and performance of system level power management designs in harsh environments.

Features:

• High accuracy±1% total accuracy over -40°C to +125°C for VDD4 and VDD3, and a ±2.5% accuracy for the measured supply current or total system power
• Integrated temperature sensing with 8-bit A/D conversion
• Inrush current prevention
• Watchdog Timer (WDT) with adjustable time-out period
• Reset output to initiate system reset
• Low quiescent current (2 μA typ)

Application Field:

The MAX6855UK39D4+T is ideal for the industrial and automotive markets that require power management in multiple electronic systems. It is designed to provide protection against loss of system voltage (VDD), WDT timeout, supply current fault, and temperature alert. The MAX6855UK39D4+T also serves as an inrush current limiter and can be used to detect battery and AC presents. In an automotive system, the MAX6855UK39D4+T can be used to monitor the battery voltage to ensure it is within an acceptable range, as well as to monitor the temperatures to ensure the system does not overheat.

Working Principle:

The MAX6855UK39D4+T is a four channel system monitor. The four channels are VDD4, VDD3, VSS4/IS4, and VSS3/IS3. The first two channels, VDD4 and VDD3, are used to monitor system voltages. The VSS4/IS4 and VSS3/IS3 channels are used to monitor either supply current or total system power. The MAX6855UK39D4+T also incorporates an integrated temperature sensor with 8-bit A/D conversion to monitor temperature and a watchdog timer (WDT) to detect an MCU or controller reset. Once the system is powered-up, the MAX6855UK39D4+T will take several readings and compare them to the predetermined thresholds. If any of the readings exceed the threshold, then the MAX6855UK39D4+T will initiate a reset of the system by pulling the RST signal low.

The MAX6855UK39D4+T also has an integrated inrush current limiter. This feature is designed to prevent system components from receiving inrush currents when they are initially powered-up. The inrush current limiter is designed to detect the voltage across the load and then, in response, will reduce the input current. The reduced current is maintained until the system voltage is stabilized, usually within several micro-seconds. This feature is especially important in automotive applications since it prevents the vehicle’s electrical system from receiving damaging inrush currents.

Conclusion:

The MAX6855UK39D4+T is an advanced and reliable power management IC that is designed for use in industrial and automotive applications. It offers an excellent feature set, including an ±1% total accuracy over the temperature range for VDD4 and VDD3, 8-bit A/D conversion for temperature sensing, and an inrush current limiter. In addition, it offers a reset output to initiate a system reset, a watchdog timer to detect MCU or controller reset, and low quiescent current. Thanks to its advanced features, the MAX6855UK39D4+T is a versatile and reliable solution for power management designs in harsh environments.

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