BQ2954SNTR Integrated Circuits (ICs)

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PMIC - Battery Chargers

A Battery Charger is an electronic device used to charge primary, secondary and tertiary batteries that are used to power a variety of electronic devices. The BQ2954SNTR is a highly integrated, low-cost application-specific integrated circuit (ASIC) designed for battery charging applications requiring high efficiency, low Iq and fewer external components. It is suitable for charging single-cell Li-ion/Polymer battery packs from USB sources.

Features of BQ2954SNTR

The BQ2954SNTR provides multiple features that make battery charging easier and more accurate, including:

• Integrated 5V to 3V3 LDO
• Integrated 0.3V.3A rated power switch
• Programmable charge current limited by an external resistor
• Charge voltage compliant to 4.2V ± 0.05V
• Programmable safety timer
• Three-level analog or digital current monitoring
• TA thresholds programming for charge termination and low voltage shutdowns
• Programmable input voltage limit to 3.4V

Application Fields

The BQ2954SNTR is suitable for a wide range of USB charging applications, such as battery charging for mobile phones, digital cameras, PDA and MP3/MP4 players, as well as portable electronic devices.

Working Principle

The BQ2954SNTR works by charging the battery pack at a fixed current provided by the external resistor. When the Charge Voltage pin reaches the threshold voltage of 4.2V, the BQ2954SNTR switches off the switch, ending the charging procedure. The BQ2954SNTR also monitors the battery\'s temperature continuously and shuts off the charge switch if the temperature rises above a preset threshold.

The BQ2954SNTR also regulates the input voltage from the USB source to 3V3 and restricts the maximum charging current to the recommended level for the specific battery. It provides Three-Level Current Monitoring for current monitoring within the cell and an open-drain NTC pin for measuring the temperature.

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