MAX812LEUS-T

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Power management ICs, or PMICs as they\'re commonly known, are essential components in most of today’s electronic devices. PMICs can provide power supply and delivery, thermal management and system supervision in a single integrated package. Supervisors are monitoring devices that provide a streamlined power architecture for modern electronics which can help to minimize system complexity, reduce cost and improve overall system robustness. The MAX812LEUS-T, from Maxim Integrated Products, is a dual-channel low-voltage supervisor IC designed for use in applications requiring an integrated monitoring and reset system. The device features a wide operating voltage range, a precision built-in voltage reference and several versatile protection features such as over-voltage, under-voltage, short-circuit detection, over-temperature protection, and much more.

Applications

The MAX812LEUS-T is specifically designed for use in various applications, such as industrial and consumer-level power supplies, voltage regulation modules, motor drive controllers, motor speed controllers, motor monitoring systems, aerospace and military equipment, security systems, and battery-powered systems.

The IC is optimized for use with 5V or 3.3V logic and can operate from an input supply voltage range of 2.7V to 7.0V. It can detect power-up, power-down, and fault conditions with a wide range of adjustable trip points, and it also provides two power supply sequencing outputs for generating reset signals or system sequencing depending on the logic state of the reset inputs. The supervisor is also designed to be used in static memory applications where it can check for correct VCC power-up sequencing and for 1.2V and 3.0V transitions.

Functional Overview

The MAX812LEUS-T features two independent supply undervoltage (UV) monitors that can detect power supply and system voltage conditions. The UV monitors detect logic supply voltage, VCC, and system voltage, VHV, which are typically 5V and 3.3V, respectively. The MAX812LEUS-T also includes a built-in precision voltage reference, an internal power-up timer, and can detect power-good, power-down, and fault conditions with a wide range of adjustable trip points.

The UV monitors feature adjustable UV threshold voltage (Vref) for VCC and VHV, adjustable UV lockout delay, and user-selectable output polarity (positive or negative). The device contains two independent reset outputs, RESET and RESETB, which can be used for generating reset signals or system sequencing depending on the logic state of the reset inputs. The reset output polarity can be user-configured for active low or active high reset.

The MAX812LEUS-T also has an open-drain amplifier output, MAXOUT, which can be used in applications such as voltage supervision, CSM reset, and logic power supply reset. The MAXOUT output can be used to monitor system voltage levels through an external resistor divider. Additionally, the device has a power-up timer (PWLT) that can be used to delay system reset during power-up, allowing the system to monitor voltage ramps and surge current before sequencing. The PWLT is configured via an external resistor and the delay time can be modulated with an external capacitor.

Internal Features

The MAX812LEUS-T contains an integrated low-dropout voltage regulator (LDO) that regulates the internal logic circuitry and other components. The LDO provides up to 2mA of output current at 1.8V which can be used to power peripherals such as internal oscillators and EEPROMs. The LDO is capable of operating from a wide input voltage range from 2.7V to 7.0V. The LDO is protected from overtemperature and overcurrent conditions. The device also contains a precision built-in voltage reference, which provides the reference voltage for the UV monitors.

The MAX812LEUS-T also provides several versatile protection features including undervoltage, overvoltage, short-circuit, over-temperature, and watchdog timer. The device features a unique reset shield protection (RSP), which protects the reset outputs against inadvertent resets due to EMI spikes and fast transients, an internal thermal sensor (ITS) with user-programmable temperature thresholds, and a watchdog timer (WDT) that can be used to reset the system in the event of a software fault.

Conclusion

The MAX812LEUS-T is an ultra-low-power, dual-channel supervisor IC designed for use in a wide range of applications including industrial and consumer-level power supplies, voltage regulation modules, motor controllers, motor speed controllers, motor monitoring systems, aerospace and military equipment, security systems, and battery-powered systems. The device features a wide operating voltage range, a precision built-in voltage reference, a power-up timer, and several versatile protection features. With its highly integrated design and versatile features, the MAX812LEUS-T is an ideal solution for a wide variety of applications.

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