LM3705XCBP-308

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Power management integrated circuits (PMICs) are vital semiconductor components in modern electronics, performing both control and switch functions. PMICs are used in various applications and offer versatile functions such as voltage regulation, power sequencing, and protection from short-circuits in applications ranging from notebook computers to smartphones and beyond. Among the various PMICs available in the market today, the LM3705XCBP-308 is a supervisor IC that is particularly suited for use as a power management companion IC for microcontrollers.This IC can monitor input power rails, detect undervoltage or overvoltage conditions and warns or shuts down the system accordingly. In addition, it offers a unique feature to control a microcontrollers reset function without forcing control bits to a prescribed level and so minimizing system complexity.The LM3705XCBP-308 is ideally suited for power management applications where microcontroller reset is needed, such as in automatically adjusting the system\'s operating parameters based on voltage levels or in resetting a microcontroller in the event of power failure.The IC has an operating voltage range of 2.5V to 5.5V with a maximum supply current of 0.3mA and thermal resistance of 25℃ per watt. The device is built on a 5.0mm × 4.0mm TQFN 40-pin package and offers an input transient protection of 14V peak with a slew rate control of 0.4V/ms.The LM3705XCBP-308 offers a dual-state reset output with an active high reset output controlling the microcontroller core and another active low state to reset peripherals. It also has a power-OK indicator that can be monitored on the Power-OK (POK) pin. This IC can be used in a variety of power management applications such as computer activities, clock synchronization and peripheral resetting, data memory protection, among others.The LM3705XCBP-308 is an undervoltage/overvoltage supervisor IC. It is used to monitor power rails in a system and detect when the voltage level drops too low or rises too high. When a voltage condition is detected, the LM3705XCBP-308 can issue a reset, alert, or power-off signal to prevent damage to the system. The application field of this IC is generally limited to power management applications.The general working principle of the LM3705XCBP-308 is based on an internal voltage-sensing circuitry and a digital state decision block. The state decision block compares the current input voltage from the power source with pre-defined reference voltages stored in the memory map of the device. Once the input voltage level is less than or greater than the reference voltage set, then the LM3705XCBP-308 generates a reset output to prevent system damages. The POK pin also relays a logic high or logic low signal to indicate whether or not the input voltage is within range.

To ensure that the proper operating voltages are maintained, the LM3705XCBP-308 utilizes an internal delay time setting to determine how long the reset signal is active. This delay time can range from 15 μs to 8.19 ms and can be adjusted based on the application requirements. If the input voltage is still out of range after the delay time expires, the LM3705XCBP-308 sends another reset command and continues to cycle until power is restored. The reset output can be used to reset the device that is being monitored or it can be used to notify external monitoring circuits of a fault condition.

The LM3705XCBP-308 is an effective device for power management applications requiring reliable monitoring of power rail voltages. Its small form factor, low power consumption, and adjustable delay time make it suitable for a wide range of applications. Its ability to monitor input voltages and issue reset commands ensures reliable protection from over- and under-voltage conditions, and its POK pin provides an additional layer of assurance. Furthermore, its small package allows easy implementation into tight spaces.

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