LM3710YQMMX-232/NOPB

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Power Management Integrated Circuits (PMIC) are necessary to accommodate the huge amount of energy-harvesting, power conditioning, and protection aspects of a modern Smart System. Whether it is a wearable, portable medical device, or automotive infotainment system, PMIC play a key role in ensuring that the system runs reliably, efficiently, and for an extended time without requiring user intervention.

Among various PMIC familes, Supervisors are an essential subgroup. Supervisors provide critical functions, such as power-on reset (POR), brownout reset, watchdog timer, and power sequencing, to ensure a system with a single master controller is resilient to power glitches and properly initialized at start up. Texas Instruments offers a wide range of Supervisors, including the LM3710YQMMX-232/NOPB.

The LM3710YQMMX-232/NOPB is a voltage monitor, POR, low-battery reset, watchdog timer, and power-on/off controller. It is used as a monitoring and reset solution for battery-powered systems and is capable of working with both 3V and 5V supply. It supports active-high and active-low reset, allowing flexibility for user-defined reset conditions. For low-battery reset, user can specify a low-voltage threshold for the input voltage. The watchdog timer has an adjustable nominal time period range from 0.75 sec to 256 sec.

The working principle of the LM3710YQMMX-232/NOPB is similar to many other Supervisors. During power-up, it monitors the input voltage for out-of-tolerance ranges. A reset is then triggered if the input voltage falls outside of the specified range. The LM3710YQMMX-232/NOPB also periodically monitors the input voltage. This allows it to detect low-battery conditions during normal operation. Once the input voltage falls below the user-defined low-voltage threshold, a reset is triggered.

The watchdog timer of the LM3710YQMMX-232/NOPB works as a safety net against system lock-up or software malfunction. Typically, users can configure the control part (master controller) to periodically “tickle” the watchdog, thus resetting its timer. If the timer has not been reset within the nominal time period, it automatically triggers a reset, restarting the system.

In addition, the LM3710YQMMX-232/NOPB contains logic to prevent uncontrolled power-down of a system. It has a power-on enable function which, when activated, prevents a system shutdown. The LM3710YQMMX-232/NOPB also has power sequencing logic. This allows the Supervisors to control the startup or shutdown timing ofSoC, memories, and other peripherals, ensuring that potential inrush current or during power-up and power-down are mitigated.

In general, the LM3710YQMMX-232/NOPB provides a simple solution to includeSupervisory circuit functions in a variety of products, reducing the system complexity and BOM cost. The LM3710YQMMX-232/NOPB can be used in automotive infotainment, wearable devices, industrial systems, and more.

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