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bq24273YFFR Datasheet(PDF) 1 Page - Texas Instruments |
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bq24273YFFR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 27 page ` SW CS+ BAT DRV PGND BYP SCL SDA BOOT HOST PMID IN System Load TEMP PACK+ PACK- CD STAT TS INT bq24273 www.ti.com SLUSB08 – JUNE 2012 2.5A, Single Input, Single Cell Switchmode Li-Ion Battery Charger with Integrated Current Sense Check for Samples: bq24273 1 FEATURES APPLICATIONS • High-Efficiency Switch Mode Charger with • Handheld Prducts Integrated Current Sense Element • Portable Media Players • Single Input Charger • Portable Equipment – 20V input rating, with 10.5V Over-Voltage • Tablets and Portable Internet Devices Protection (OVP) APPLICATION SCHEMATIC – Integrated FETs for Up to 2.5A Charge Rate • Integrated Charge Current Sense Element for Reduced BOM Count and Board Space Savings • Safe and accurate Battery Management Functions – 0.5% Battery Regulation Accuracy – 10% Charge Current Accuracy • Voltage-based, NTC Monitoring Input (TS) – JEITA Compatible • Thermal Regulation Protection for Output Current Control • BAT Short-Circuit Protection • Soft-Start Feature to Reduce Inrush Current • Thermal Shutdown and Protection • Available in Small 49-ball WCSP or QFN-24 Packages DESCRIPTION The bq24273 is a highly integrated single cell Li-Ion battery charger with integrated charge current sense element device targeted for space-limited, portable applications with high capacity batteries. The single cell charger operates from a dedicated power source such as a wall adapter or wireless power supply for a versatile solution. The integrated sense element eliminates the need for an external sense resistor reducing the total solution size and external component count. The battery is charged in three phases: precharge, fast charge constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. Charge is terminated based on user-selectable minimum current level. A software watchdog provides a safety backup for I2C interface while a safety timer prevents continuously charging a damaged battery. During normal operation, bq24273 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status is reported to the host using the I2C interface. Additionally, a voltage-based battery pack thermistor monitoring input (TS) is included that monitors battery temperature for safe charging. The TS function for bq24273 JEITA compatible. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2012, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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