LM809M3-2.93/NOPB Integrated Circuits (ICs)

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Power management integrated circuits (PMICs) are specialized ICs designed to improve power management within an electronic device. Supervisors are one of the many types of PMICs and are mainly used for providing reset and watchdog timer (WDT) functions. One of the many types of specialty supervisors is the LM809M3-2.93/NOPB, which is an integrated supervisor with voltage monitoring capability.

The LM809M3-2.93/NOPB is primarily used in applications that could benefit from voltage and adjustable reset monitoring, such as automated test systems, RF signal processor boards and other consumer applications requiring adjustable reset and voltage monitoring. Additionally, this supervisor is suitable for many embedded microprocessor systems where active reset is required for system protection and voltage monitoring is needed to prevent over-voltage, under-voltage, loss of power and brownouts.

The working principle of the LM809M3-2.93/NOPB is based on its monitoring of the input voltage and its reference voltage to release and reset the output, referred to as either /RESET or /RST. The reset signal is active low and is generated when the input voltage is below the reference voltage. The reset signal remains active until the input voltage rises above the reference voltage plus a blanking time delay. The reset time delay is user-adjustable and allows the user to configure the reset circuit to their system requirements.

The LM809M3-2.93/NOPB is housed in a 5-pin SOT-23 package, with the pins occupied by VDD, GND, RST, TST, and VCC. It operates on a supply voltage of 2.93 or 5.5V and its nominal reference voltage is 2.4V. On startup, its output voltage is set to default logic high as well as a reset flag, indicating the IC is in its normal state.

The IC also has a watchdog timer whose period is set by a capacitor connected to the TST pin. This allows the system to detect a potential problem and issue a reset if the input voltage drops below the reference voltage or when a logic level low stays active for the predetermined timeout period.

Additionally, the LM809M3-2.93/NOPB features thermal shutdown protection, which shuts down the IC if the die temperature exceeds a threshold. To enable the reset function to take effect, the user must connect a resistor between the VDD and RST/RST pins. To enable the Watchdog timer, the user must connect a resistor between the TST and GND pins.

The LM809M3-2.93/NOPB is an integrated supervisor with voltage monitoring capabilities and adjustable reset time delays, making it ideal for applications such as automated test systems, RF signal processor boards and embedded microprocessor systems protection. It is designed to provide reliable system protection and power monitoring for a wide range of applications.

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