LTC2941-1 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2941-1

1A I2C Battery Gas Gauge with Internal Sense Resistor

Linear Technology 

Features

n Indicates Accumulated Battery Charge and

Discharge

n SMBus/I2C Interface

n Integrated 50mΩ High Side Sense Resistor

n ±1A Sense Current Range

n High Accuracy Analog Integration

n 1% Charge Accuracy

n Configurable Alert Output/Charge Complete Input

n 2.7V to 5.5V Operating Range

n Quiescent Current Less than 100µA

n Small 6-Pin 2mm × 3mm DFN package

Applications

n Low Power Handheld Products

n Cellular Phones

n MP3 Player

n Cameras

n GPS

LTC2941-1

1A I2C Battery Gas Gauge

with Internal Sense Resistor

Description

The LTC®2941-1 measures battery charge state in battery-

powered handheld PC and portable product applications.

Its operating range is perfectly suited for single cell Li-Ion

batteries. A precision coulomb counter integrates current

through an internal sense resistor between the battery’s

positive terminal and the load or charger. The measured

charge is stored in internal registers. An SMBus/I2C in-

terface accesses and configures the device.

The LTC2941-1 features programmable high and low

thresholds for accumulated charge. If a threshold is ex-

ceeded, the device communicates an alert using either the

SMBus alert protocol or by setting a flag in the internal

status register.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot

Swap, ThinSOT and Bat-Track are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

Typical Application

CHARGER

I2C/SMBus

TO HOST

SENSE+

LTC2941-1

AL/CC

SDA

SENSE–

SCL

GND

LOAD

0.1µF

+ 1-CELL

Li-Ion

29411 TA01a

Total Charge Error vs Sense Current

1.00

VSENSE+ = 3.6V

0.75

0.50

0.25

0

–0.25

–0.50

–0.75

–1.00

1

10

100

|ISENSE| (mA)

1000

29411 TA01b

29411f



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