MAX709LCUA+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	4.65V
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package:	8-uMAX
Base Part Number:	MAX709

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Power Management Integrated Circuit (PMIC) - Supervisors

Power Management Integrated Circuits (PMIC) are specialized integrated circuits (IC) used for solving power management problems. They help coordinate and control the power supply requirements of a system by providing efficient management and control of the supply voltages, current, power and energy. As one of the most important categories of PMICs, supervisors, sometimes referred to as “undervoltage detectors” or “brown-out detectors” are very common in the market.At the heart of the supervisors is a voltage detector that turns on or off when the voltage reaches a certain threshold. Common types of supervisors are MAX709LCUA+ and MAX709LCU+. The MAX709LCUA+ is well-associated with microprocessor supervisory circuits and mobile device power sequencers, while MAX709LCU+ is suited to high-accuracy voltage supervision and system reset applications in servers, routers and high-end equipment. This paper will focus on the application field and working principle of the MAX709LCUA+ supervisor.

Application field

The MAX709LCUA+ can be used in a broad range of applications including computer systems, mobile phones, GPS receivers, and other portable applications. In these application, the MAX709LCUA+ monitors the power supply voltage, providing microprocessor’s reset control, power fail warning, and brown-out detection.In general, the MAX709LCUA+ supervisor is applied to microprocessor systems and power-up/power-off sequencing circuits. It acts as a low-voltage detector and a reset generator, providing power on reset (POR) and power-fail reset (PFR) functions.

Working principle

The MAX709LCUA+ contains a voltage detector and a reset generator. The voltage detector monitors the system power supply voltage and sends a low active signal to the reset generator. The reset generator is designed to generate a reset signal for microprocessor reset control, power fail warning, and brown-out detection. The MAX709LCUA+ utilizes a power control circuit that is designed to monitor its supply voltage and provide a reset output when the supply voltage falls below its predetermined thresholds. The MAX709LCUA+ includes a compare voltage of 2.32V or 4.03V, depending on the versions. If the input voltage is lower than the compare voltage, the reset output (RESET) will be pulled low. When the input voltage rises above the threshold voltage the reset output is released and allowed to float between high and low states. When RESET is applied, the system will be reset, and the MAX709LCUA+ will remain in the reset state until the supply voltage has returned to a stable level above the compare voltage. The reset delay time, which varies with supply voltage, is designed to ensure system stability.In summary, the MAX709LCUA+ is the essential component of microprocessor supervisory circuits and mobile device power sequencers, providing system reset control, power fail warning, and brown-out detection functions. It can be widely used in various applications due to its low supply current, low-voltage threshold and low-power consumption. Its working principle is based on comparing the system power supply voltage with its predetermined threshold, and provide a reset output when the supply voltage is lower than the threshold.

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