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PMIC - Supervisors

Power Management Integrated Circuits (PMIC) are an essential part of modern electronics designs, providing the necessary controls for managing the energy needs of systems. One such PMIC device is the S-1009N26I-I4T1U, a low-power supervisor and reset management IC designed to provide reliable power-on-reset and system voltage monitoring functions. In this article, we\'ll look at the application field and working principle of this device.

Application Field

The S-1009N26I-I4T1U is a very versatile device, suitable for a wide range of modern electronics designs. With its wide input voltage range, low power consumption and simple 3-wire interface, this PMIC makes controlling and monitoring power subsystems easy. It is an ideal solution for applications such as industrial control systems, medical equipment and consumer appliances.

The S-1009N26I-I4T1U\'s input voltage range is 1.7V to 7.0V, and its power supply current requirement is < 1.0µA. Other features include a reset trigger voltage range of 0.9V to 5.5V, and a reset output delay of up to 2.0ms. The device also has a power-fail output signal with precise under-voltage threshold and glitch-free power sequencing.

The S-1009N26I-I4T1U includes a manual reset input, a power-up reset (POR) output, and a power-down reset input. The POR output can be used to reset any logic circuits in the system, including microcontrollers. The device is available in a tiny 2.25mm x 2.70mm QFN16 package, making it perfect for space-sensitive applications.

Working Principle

The S-1009N26I-I4T1U serves as a power supervisor, protecting the system by monitoring supply voltages and generating reset signals as needed. It has two voltage comparators that monitor the supply voltage and two comparators that monitor reset signal inputs. When the supply voltage drops below the under-voltage threshold, the POR output is activated and the reset signal is assertedd. The reset signal will remain active until the supply voltage rises above the under-voltage threshold.

The S-1009N26I-I4T1U monitors the supply voltage continuously, and the POR output is activated after a power-on sequence is complete. This ensures that the system does not malfunction due to an incorrect power-up sequence. The device also features an enable input, which can be used to override the reset signal and to disable the device in low-power applications.

The S-1009N26I-I4T1U also provides a power-fail output signal, which is activated when the input supply voltage drops below the power-fail threshold. This can be used to provide a warning that the supply voltage has dropped below a certain level and to shut down the system in a controlled fashion. The power-fail output signal can also be used to enable power saving features such as low-power mode or hibernation.

The S-1009N26I-I4T1U is an excellent choice for system-level power management. With its wide input voltage range, low power consumption, reset trigger voltage range, and many other features, it is an ideal solution for most modern electronics designs.

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