UCC3946NG4

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The UCC3940NG4 is a Low-Dropout Supervisor with an integrated Output Delay circuit, designed to supervise almost any power-supply or battery-backed supply for embedded systems. It features an active-low reset output, a Manual Reset input (MR or PRSNT input), and an Open Drain Manual Reset Output (MROUT or GATE). The low-dropout (LDO) feature of this device allows for highly efficient and cost-effective power supplies. The UCC3940NG4 also features an optional external time delay circuit to delay the reset output until the supply power is stable. This output delay feature is especially important for large-scale logic and microcontroller systems that require stable power during system reset.

The UCC3940NG4 is designed to monitor the voltage of the power supply or battery and output a reset signal when the Vcc voltage is either below the undervoltage threshold or exceeds the overvoltage threshold. The reset released when the voltage returns to normal. The manual reset pin allows the user to control, reset and release the system when required. With the integrated output delay, the reset output is delayed until the supply power is stable, thus allowing the system to detect and act on potential system defects.

The UCC3940NG4 is suitable for use in a wide range of applications, including industrial control systems, embedded systems, telecommunications, and consumer electronics. In industrial control systems, it is used to monitor the DC power supply, preventing power failure from affecting the machine\'s operation. In embedded systems, it is used to automatically reset the system after shut down and power up. In telecommunications, it is used to monitor the voltage of sideband panels and detect any voltage drops before the system fault occurs. In consumer electronics, it is used to monitor and control the battery status in mobile device applications such as cellular phones and wearable devices.

The UCC3946NG4’s functional block diagram is divided into four main sections: the reference circuit, the comparator, the reset control circuit, and the reset output circuit. The reference circuit senses the voltage of the Vcc supply and provides the comparator with a reference voltage. The comparator compares the reference voltage with an adjustable threshold voltage generated by an external resistor. When the reference voltage exceeds the threshold voltage, an active-low reset signal is generated. The reset control circuit controls the reset output, which is monitored by the reset output circuit. If a reset is desired, the reset output can be enabled while the MR pin is held high. If a reset is not desired, the reset output can be disabled while the MR pin is held low.

In summary, the UCC3946NG4 is a Low-Dropout Supervisor with an integrated Output Delay circuit, which is suitable for a wide range of applications. It features an active-low reset output, a Manual Reset input, and an Open Drain Manual Reset Output. It monitors the voltage of the power supply or battery, and outputs a reset signal when the Vcc voltage is either below the undervoltage threshold or exceeds the overvoltage threshold. It also provides a delay on the reset output until the supply power is stable. The device is ideal for industrial control systems, embedded systems, telecommunications, and consumer electronics, as it ensures uninterrupted operation of the systems.

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