BQ27425-G2_14 Datasheet, PDF (1/35 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

bq27425-G2
www.ti.com
SLUSB23A – OCTOBER 2012 – REVISED FEBRUARY 2013
System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor
Check for Samples: bq27425-G2
FEATURES
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•23 Single series cell Li-Ion battery fuel gauge
– Resides on system board
– Supports embedded or removable batteries
– Powered directly from battery with
integrated LDO
– Low-value integrated sense resistor
(10 mΩ Typical)
• Easy to configure fuel gauging based on
patented Impedance Track™ technology
– Reports Remaining Capacity and State of
Charge (SOC) with Smoothing Filter
– Automatically adjusts for battery aging,
self-discharge, temperature, and rate
changes
– Battery State of Health (aging) estimation
• Microcontroller peripheral supports:
– 400-kHz I²C ™ serial interface
– Configurable SOC Interrupt, or
Battery Low digital output warning
– Internal temperature sensor, or
Host reported temperature
• 15-pin 2,69 × 1,75 mm, 0.5 mm pitch CSP
package
APPLICATIONS
• Smartphones, Feature phones and Tablets
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
DESCRIPTION
The Texas Instruments bq27425 is an easy to
configure microcontroller peripheral that provides
system-side fuel gauging for single-cell Li-Ion
batteries. The device requires minimal user
configuration and system microcontroller firmware
development.
The bq27425 uses the patented Impedance Track™
algorithm for fuel gauging, and provides information
such as remaining battery capacity (mAh), state-of-
charge (%), and battery voltage (mV).
Battery fuel gauging with the bq27425 requires
connections only to PACK+ (P+) and PACK– (P–) for
a removable battery pack or embedded battery
circuit. The 15-pin 2.69 × 1.75 mm, 0.5 mm pitch
CSP package is ideal for space constrained
applications.
TYPICAL APPLICATION
System
Interface
I2C
VCC
VBAT
REGIN
LDO
bq27425
DATA
Voltage
Sense
PACK +
To Charger
T
Single Cell Li- Ion
Battery Pack
PROTECTION
IC
GPOUT
BIN
SRX
Integrated
Current
Sense
VSS
PACK -
FETs
CHG
DSG
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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.
Impedance Track is a trademark of Texas Instruments.
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is a trademark of ~NXP B.V. Corp Netherlands.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated