BQ27425-G1 Datasheet, PDF (1/32 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

bq27425-G1
www.ti.com
SLUSAI6 – NOVEMBER 2011
System-Side Impedance Track™ Fuel Gauge With Integrated
Sense Resistor
FEATURES
1
•23 Battery Fuel Gauge for 1-Series LiCoO₂ battery
Applications
• Easy to Configure Battery Fuel Gauging Based
on Patented Impedance Track™ Technology
– Models Battery Discharge Curve for
Accurate State-of-Charge Report
– Automatically Adjusts for Battery Aging,
Battery Self-Discharge, and
Temperature/Rate Inefficiencies
– Low-Value Integrated Sense Resistor
(10 mΩ typical)
• Resides on System Main Board
– Works with Embedded or Removable
Battery Packs
– Integrated LDO allows devices to be
powered directly from battery pack
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging
– Internal Temperature Sensor for Battery
Temperature Reporting
– Configurable Level of State-of-Charge
(SOC) Interrupts
• I²C™ for Connection to System
Microcontroller Port
• Small 15-pin 2,69 × 1,75 mm, 0.5 mm pitch
CSP package
TYPICAL APPLICATION
APPLICATIONS
• Feature Phones
• Smart Phones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
DESCRIPTION
The Texas Instruments bq27425 system-side LiCoO₂
battery fuel gauge is an easy to configure
microcontroller peripheral that provides fuel gauging
for single-cell LiCoO₂ battery packs. The device
requires minimal user configurations and system
microcontroller firmware development for accurate
fuel gauging.
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 only
PACK+ (P+), 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.
System
Interface
I2C
VCC
VBAT
REGIN
LDO
bq27425
DATA
Voltage
Sense
PACK +
To Charger
T
GPOUT
BIN
SRX
Integrated
Current
Sense
VSS
PACK -
Single Cell Li- Ion
Battery Pack
PROTECTION
IC
FETs
CHG
DSG
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.
Impedance Track is a trademark of Texas Instruments.
2
I²C is a trademark of Phillips Corporation.
3
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 © 2011, Texas Instruments Incorporated