MAX6867UK23D3S+T

Power management integrated circuits (PMICs) play an important role in system-level electronic design. In the market of power control solutions, PMICs provide power efficiency and improved optimization of circuit design. In particular, Supervisors are a specialized type of PMICs designed primarily to take care of the power-up, power-down, and reset management of a system. MAX6867UK23D3S+T is a supervisor IC developed by Maxim Integrated. This document provides a technical overview of this product, focusing on its application field and working principle.

Application Field

The MAX6867UK23D3S+T supervisor IC is a high-performance, microprocessor-supervisor circuit designed for system power management and reset sequencing. It is ideal for use in microcontroller-based systems, single- and multi-voltage processor designs, medical equipment, RFID readers, and application-specific industrial equipment.

This IC includes various features that provide flexibility and performance for system power sequence control. It includes an internal low-power oscillator, two low-power reset outputs, adjustable sequenced reset, adjustable voltage detection windows, and a power-good output.

Its small 5-pin SOT23-5 package and minimal power consumption make it an ideal fit for battery-operated applications. Moreover, its wide operating voltage (2.5V-5.5V) and temperature range (-40°C to +85°C) make it suitable for a wide range of applications.

Working Principle

The MAX6867UK23D3S+T supervisor IC is designed to monitor system voltage and extend battery life. It has two power-on reset (POR) outputs, one active-high RESET output and one active-low RESET output. The outputs are designed to ensure accurate sequencing of user-defined power events.

The MAX6867UK23D3S+T supervisor IC provides a power-good (PG) signal that indicates when the system voltage is stable after power-on reset. It is triggered when the system voltage rises above the rising threshold voltage (VTHR), which is set with a resistor divider. When the system voltage drops below the falling threshold voltage (VTHF), the PG signal is de-asserted. The thresholds can be adjusted from 2.5V to 5V.

The IC also includes an adjustable latency timer to adjust the reset pulse width. The timer sets the length of time the reset output remains in the high state after VTHF is reached. This allows for proper initialization of the system upon power-up.

In order to further enhance system reliability, the MAX6867UK23D3S+T supervisor IC also features an adjustable watchdog timer. The timer monitors the frequency and duration of incoming pulses. If it senses a pulse outside of its predetermined range, it will assert a reset signal. This feature helps to ensure that the system is functioning normally even in the event of a fault.

The MAX6867UK23D3S+T supervisor IC also provides system protection with built-in overvoltage and brownout protection. This ensures that system failure due to overvoltage and undervoltage conditions is minimized.

Conclusion

MAX6867UK23D3S+T is a specialized type of PMIC and is designed to provide enhanced system reliability, power optimization, and power efficiency. Its wide operating voltage and temperature range, as well as its low power consumption, make it an ideal choice for various applications. In addition, its built-in watchdog timer and overvoltage/undervoltage protection make it a reliable solution for system power sequence control.