LM3722EM5X-4.63

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The LM3722EM5X-4.63, which belongs to the PMIC - Supervisors family, is a triple output supervisor designed for applications that require maximum system power reset monitoring for overvoltage, undervoltage and fault conditions. The three independent outputs provide the reset signal to protect the system from potential damage from power system glitches. All outputs have a programmable output time delay and a push-pull or open-drain output configuration.

Application Field

LM3722EM5X-4.63 is particularly suitable for power supply monitoring and controlling in SMPS, DC/DC converter, PLC, telecommunication, and computer systems. It enables designs to reliably reset system power and prevent the system from entering an undefined state during power-on ramping and brown-out conditions. It provides a simple, economical, and reliable power monitoring solution that requires minimal external components.

Key Features

The LM3722EM5X-4.63 Supervisors offer a variety of features that enable designers to implement a reliable and robust power monitoring subsystem. These features include adjustable threshold detection for both overvoltage and undervoltage reset, programmable output time delay, push-pull or open-drain outputs, and a low standby current. Other features include a power-on reset and an active-high or active-low reset output.

Operating Mode

The LM3722EM5X-4.63 has three operating modes: normal, manual reset and power-on reset. In normal mode, the supervisor monitors the input voltage and if it falls below or rises above the preset values, it will assert the reset output. In manual reset mode, the reset output is forced to the active low state until the reset pin is pulled low, at which point it will reset the reset output. In power-on reset mode, the reset output is disabled when the reset pin is pulled high and is forced to the active high state when the reset pin is pulled low.

Working Principle

The LM3722EM5X-4.63 Supervisors utilizes an integrated high-precision voltage regulator and comparator to monitor the input voltage for preconditioned user-defined overvoltage and undervoltage conditions. When it detects an overvoltage or undervoltage condition, it will assert the reset output signal. The reset output signal can be configured as either a push-pull output or as an open-drain output. The reset output signal is also time delay programmable, which allows the user to configure the system for power-on delay, brownout reset, or other user-defined reset conditions.

Conclusion

The LM3722EM5X-4.63 Supervisors offer robust protection against overvoltage and undervoltage conditions, while at the same time providing a low standby current, programmable output time delay, as well as push-pull or open-drain outputs. This makes them ideally suited for a variety of applications that require reliable power monitoring and reset protection, including reliable protection from power system transients.

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