LM3708XQBP-308/NOPB

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Power management integrated circuits (PMICs) form a multidimensional device class with a wide selection of integration, features and applications. Despite the varying levels of complexity and specifications, PMICs generally work to regulate the power distribution and sequencing throughout the board, manage control systems and provide watchful supervision. Application fields and working principle of one of PMICs, LM3708XQBP-308/NOPB, is the topic of this article.

Background

Power management integrated circuits (PMICs) are commonly needed in various microprocessors, actuators, sensors, as well as in any other microelectronic hardware applications. Power management integrated circuits guide, control and sequence the distributed power sources throughout the circuit. RoHS-compliant and available in a variety of surface-mount packages, each PMIC is configured to meet specific power requirements and offer unique features essential for successful product design.

Description

The LM3708XQBP-308/NOPB is one of Power Management Integrated Circuits (PMICs). It has three main functions: voltage supervision, voltage monitoring and voltage control. This PMIC is fabricated using Advanced Power Management (APM) technology - also commonly known as System-On-Chip (SOC), an advanced form of power management which provides a low-cost solution with maximum performance, integrated protection, and high thermal performance. The LM3708XQBP-308/NOPB has a wide voltage range of 1.5V to 5.5V and provides voltage supervision and voltage control to various microprocessors. The voltage control part of the PMIC has up to 4 separate voltage outputs, 2 adjustable PWMs and 3 adjustable independent linear regulators. The PWM outputs can be set up for a variety of output ranges, allowing flexible configuration for the board application.

Application Fields

The LM3708XQBP-308/NOPB has a wide range of applications, including but not exclusive to power management in microprocessors, notebooks, PDAs and similar embedded applications. It is ideal for use in energy-saving and noise-reducing applications. The PMIC can be used in industrial, telecommunications and residential applications.Typical applications of the LM3708XQBP-308/NOPB include power sequencing, voltage monitoring and control, power management and supply monitoring. Power sequencing applications use the PMIC to assure that the microprocessors have a predefined power-up/down sequencing, while voltage monitoring and control applications provide voltage level alignment and voltage control through the PWMs and regulators. This can also be used to minimize power loss in the system. Supply monitoring is also provided by the LM3708XQBP-308/NOPB for supply levels, power supply regulation and power management.

Working Principle

The LM3708XQBP-308/NOPB monitors the voltage level at one or two regulated (sensed) points and drives the enable signal of a controllable DC/DC converter, allowing for the power on/off sequence of the system. The voltage monitoring part of the PMIC consists of two regulators that monitor the voltage level at one or two regulated (sensed) points. When the voltage level drops below a predetermined level, the output of the regulator trips and sends a signal to the circuit\'s control unit, causing the power to be shut down. The voltage control part of the PMIC consists of 4 separate voltage outputs, 2 adjustable PWMs and 3 adjustable independent linear regulators. The PWMs are adjustable and provide voltage level alignment and voltage control, while the regulators can be used to reduce the power loss in the system. The adjustable linear regulators can also be used to provide a stable output voltage. The PMIC can be configured for a variety of output ranges, allowing for flexible configuration of the board.

Conclusion

The LM3708XQBP-308/NOPB is one of the Power Management Integrated Circuit (PMIC) from Advanced Power Management (APM) technology. It integrates voltage supervision, voltage monitoring and voltage control. It supports 1.5V to 5.5V range and offers power sequencing, voltage monitoring and control, power management and supply monitoring. The PWM outputs can be set up for a variety of output ranges, allowing for flexible configuration of the board application. This PMIC classifies under PMIC - Supervisors.

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