LTC2944I

Part: LTC2944

Type: Battery Gas Gauge with Temperature, Voltage and Current Measurement

Key Specs:

• Operating Range: 3.6V to 60V
• ADC Resolution: 14-Bit (Voltage, Current, Temperature)
• Accuracy: 1% Voltage, Current and Charge
• Sense Voltage Range: ±50mV
• Quiescent Current: Less Than 150μA

**Features

The LTC®2944 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage range allows use with multicell batteries up to 60V. A precision coulomb counterintegratescurrentthrough a senseresistorbetween the battery's positive terminal and the load or charger. Voltage, current and temperature are measured with an internal 14-bit No Latency ΔΣ™ ADC. The measurements are stored in internal registers accessible via the onboard I 2C/SMBus Interface.

TheLTC2944featuresprogrammablehighandlowthresholds for all four measured quantities. If a programmed threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register. The LTC2944 requires only a single low value sense resistor to set the measured current range.

All registered trademarks and trademarks are the property of their respective owners.

SENSE+ ALCC SDA SCL LTC2944 CHARGER 2k2k 2k 1A LOAD RSENSE 50mΩ MULTICELL Li-ION 2944 TA01a SENSE– + GND 1μF VDD 3.3V μP

Total Charge Error vs Differential Sense Voltage

2944 TA01b

• ⁿ Electric and Hybrid Electric Vehicles
• ⁿ Power Tools
• ⁿ Electric Bicycles, Motorcycles, Scooters
• ⁿ High Power Portable Equipment

Typical Application

• ⁿ Photo Voltaics
• ⁿ Backup Battery Systems

Order Information http://www.linear.com/product/LTC2944#orderinfo

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2)

• VSENSE+
• ISUPPLY
• ISENSE+
• ISENSE–
• VUVLO
• Coulomb Counter
• VSENSE
• RIDR
• qLSB

Order Information http://www.linear.com/product/LTC2944#orderinfo

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.