MC34161D

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A PMIC - Supervisors, or Power Management Integrated Circuit - Supervisors, is a device designed to ensure a device’s power is properly managed and distributed in a system. The MC34161D is a P-channel MOSFET supervisor for low-power, low-voltage devices. It is a CMOS device which combines functions such as voltage monitoring, reset generation, voltage sequencing, and fault time-out into one integrated circuit.

The main application field of the MC34161D is in low-voltage systems. This device is designed to monitor voltages in the range of 1.6 V to 6 V and respond accordingly when these voltages supply the system. It is commonly used in telecommunication systems, such as DSL transceivers or Local Area Network (LAN) systems, as well as LCD and plasma displays. The MC34161D is also suitable for use in power management systems in computers and intelligent platforms.

The main working principle of MC34161D is to monitor the supply voltage of the system and generate a reset signal when it is below the threshold voltage. The voltage level is monitored by comparing a voltage reference with a voltage divider (also called as monitor input), a system-defined fraction of the input voltage. The voltage reference is an internally programmable voltage of 5–9.5 V or an external voltage applied to the Vref pin. The reset signal is activated if the monitor input falls below the selected reference voltage and is de-activated if the voltage is equal or above the reference voltage. The reset signal is an open-drain output which can be used to trigger reset circuitries.

In addition to reset signal generation, the MC34161D also controls the power sequencing in the system. This is done by controlling the on-time of the power supply and providing adequate delay between the various power up and shutdown sequences. The device features a programmable Fault Time-Out period (FTO) which signals faults in the system’s voltages. The fault time-out period is activated if the monitor input voltage is still below the reference voltage after the predefined time period. This feature is useful for detecting malfunction in the system’s voltage distribution and enables the device to take preventive actions against system shutdowns.

To ensure higher reliability of the reset signal, the MC34161D has an on-chip ESD protection diode. This diode prevents external Electro Static Discharges (ESDs) to be conducted to the device and causing damage or malfunction. Furthermore, the device is also provided with some additional features such as programmable debounce times and logic-level input and outputs to complete its functionality.

The MC34161D is a versatile IC designed to provide a robust monitoring system which provides reliable power management and monitoring of the system’s voltage supply and reset signal generation. It is suitable for use in low-voltage, low-power systems. By combining reset signal generation, voltage monitoring, and fault time-outs, the MC34161D is an ideal solution for power management in systems with tight design constraints.

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