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bq24273YFFR Datasheet(PDF) 1 Page - Texas Instruments

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Part # bq24273YFFR
Description  2.5A, Single Input, Single Cell Switchmode Li-Ion Battery Charger with Integrated Current Sense
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

bq24273YFFR Datasheet(HTML) 1 Page - Texas Instruments

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background image
`
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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