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PMIC - Supervisors: LTC2911CTS8-3 Application Field and Working Principle

The LTC2911CTS8-3 is a Power Management and Supervisory IC (PMIC-Supervisor). It is an advanced single-cell Li-Ion/LiPo battery charger and system power monitor, designed to simplify design and/or simplify applications in low-power system and battery management applications such as wireless phones, tablets, and notebooks. Combining a battery charging circuit and four linear voltage regulators with monitoring functions, the LTC2911CTS8-3 offers support for multiple cells, current steering and reverse battery disconnection, power-good and cell undervoltage lockout protections, plus low power shutdown and automatic backlight control. It also provides a constant current regulation loop for the battery charger that drastically reduces solution size and cost.

Application Areas

The LTC2911CTS8-3 is suitable for a range of applications, including:

• Portable and handheld devices
• Wearable and healthcare devices
• Mobile and industrial instrumentation
• Wireless and energy-harvesting devices

Features and Benefits

The LTC2911CTS8-3 offers several advantages over alternative solutions. These advantages include:

• Simplified power management: The combined battery charger and four linear voltage regulators allow designers to optimize their power system by utilizing a single IC.
• Reduced cost and size: The LTC2911CTS8-3 drastically reduces component count, board space, and power consumption.
• Improved reliability: The battery charger and four linear voltage regulators in the LTC2911CTS8-3 provide superior monitoring and protection functions, improving system reliability and robustness.

Working Principles

The LTC2911CTS8-3 consists of several core functions, including a battery charger and four linear regulators. The battery charger energizes the battery from an AC/DC supply, and monitors battery voltage and charging current. The four linear voltage regulators output 3.3V, 2.5V, 1.8V, and 1.4V from their SNS pins, and supply their output power to the load. The LTC2911CTS8-3 also monitors battery voltage and current from the PGOOD, UVP, and GPA pins, and provides additional power management functions such as backup and low power shutdown.

The LTC2911CTS8-3 is designed to be a complete power-management solution for low-power systems. It combines a complete battery charger and four linear voltage regulators with monitoring functions. As a result, it eliminates the need for additional external components and greatly simplifies the design and implementation of power-management solutions in portable and mobile applications.

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