APX809S05-40SA-7

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Power management integrated circuits (PMICs) are semiconductor devices that are variously used to efficiently manage the power supply in electronic systems. The APX809S05-40SA-7 is one such device, and belongs to the PMIC supervisors category. This particular supervisor is used to protect the system from undervoltages and overvoltages, helping to maintain stable power delivery and keep it within the recommended operating range.

Overview

The APX809S05-40SA-7 device is designed to monitor system power levels and provide warning and protection against undervoltages and overvoltages. The device is housed in a 4-terminal SOT-23 package and is available in temperature ranges from -40°C to 85°C. It is designed with a low supply current of only 0.08μA (at a voltage of 1.8V). The device also features an active-low reset output, an adjustable reset threshold, and an active-low power good (PG) output.

Application Field

The APX809S05-40SA-7 is typically used in battery-backed systems to maintain system stability during power transients. Its reset and power good outputs make it suitable for applications such as brown-out detectors, power-on reset generators, low voltage reset generators, and power path protection. These devices are ideal for short-circuit and inrush current protection as well as in-rush current limit protection.

In addition to providing power protection, the APX809S05-40SA-7 can also be used to improve system efficiency by reducing peak currents and generating reduced supply current. This device is suitable for a wide range of applications, including: computers, printers, network interface cards, portable medical equipment, data backup and recovery systems, security systems, and military equipment.

Working Principle

The APX809S05-40SA-7 works by using a voltage reference IC to directly compare the monitored voltage level (Vin) with a predetermined threshold (VEM) (typically 2.5V or 2.6V). When the input voltage (Vin) falls below the threshold voltage (VEM), the reset output pin transitions from low to high, triggering a reset. This reset applies to both the main power supply and the CPU.

The device also features a power good (PG) output. This output is kept low until the input voltage (Vin) is within acceptable levels, i.e. above the set threshold (VEM). When the input voltage (Vin) is above the threshold (VEM), the power good (PG) output transitions to high. This allows the system to reset itself to a safe state before activating the main power supply.

The APX809S05-40SA-7 device has a wide operating temperature range that makes it suitable for use in harsh environments. Therefore it is suitable for a variety of uses in varying temperatures and industrial applications. With its adjustable reset threshold, active-low reset output and power good (PG) output, this device offers an efficient and reliable form of power protection for a variety of applications.

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