LM3702XCBPX-308

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Power management integrated circuits, or PMICs, are the brains of many smart devices. They determine the device\'s power performance, accuracy, reliability, and communication. The LM3702XCBPX-308 is a highly integrated supervisor IC with dynamic integrated reset/power on reset (PWR ONR) and power sequencing features. This supervisor is an excellent example of a state-of-the-art PMIC technology.

Application Field

The LM3702XCBPX-308 is capable of providing system supervisory functions for one to four selectable power-down (standby) supplies and one microprocessor supply. It can also provide accurate reset timing and provide for 2 microprocessor supply monitor. Additionally, this supervisor enables power sequencing, dynamic and fixed reset, power-on reset, automatic power down control and diagnostic functions for microprocessor-based systems.

This power supervisor is suitable for many application fields, such as industrial process control, appliances, retail POS, and automotive. It can be used to monitor and sequence power in systems with multiple voltage rails, to protect the system against brown-out conditions by monitoring the power source(s), to prevent improper power-up and power-down sequences, and to provide reset and shut-down functions.

Furthermore, this power supervisor is designed for high-integrity applications that use an enabled or disabled signal to control sequencing of a healthy, valid power supply. Its low supply current requirement, integrated output drivers and selectable pull-up or pull-down characteristics make it an excellent choice for these applications.

Working Principle

The LM3702XCBPX-308 supervisor IC contains a voltage regulator and oscillator that generate a reset signal on power up. It also has integrated reset and power on reset (PWR ONR) features that enable the system to maintain a stable power state during startup, suspend, and power down. The power supervisor allows users to program the reset delay time and output type, as well as adjust the reset threshold voltage.

The reset logic is built with CMOS, inverting Schmitt triggers, and logic gates. The reset logic is designed to provide a reset signal that is active low, and it requires a minimum reset pulse duration of 400ms. When the power supply voltage drops below the reset threshold, the circuit will reset and the output will be asserted low until the voltage rises again. Some of the IC versions feature an adjustable voltage-level window for resetting the circuit.

In addition, the LM3702XCBPX-308 supervisor IC also has a power sequencing feature. The power sequencing feature ensures that power is supplied in the correct order in the system, and it can be used to sequence the different power rails in a system to achieve proper power on and power off sequencing. It can also be used to delay the start-up of various components and to create a safe power-up sequence.

The IC also includes several other features to improve system performance, including a microprocessor supply monitor, a low power-sequence delay mode, and open-drain inputs (logic receivers) to better handle electromagnetic interference. Finally, the LM3702XCBPX-308 supervisor IC is available in several package sizes, and it can be mounted on either a surface-mount or through-hole PCB.

Conclusion

The LM3702XCBPX-308 is an excellent example of a state-of-the-art PMIC technology. It offers many advantages such as high integration, low supply current requirements, dynamic reset and power-on-reset functionality, and accurate power sequencing features. It is suitable for many application fields and can be used to protect against brown-out conditions, prevent improper power-up and power-down sequences, and provide reset and shut-down functions. Additionally, the IC features integrated output drivers and selectable pull-up or pull-down characteristics, making it an excellent choice for a variety of applications.

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