LTC2941

1

2941f

TYPICAL APPLICATION

DESCRIPTION

Battery Gas Gauge

The LTC

supplied 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 a sense resistor between the battery’s positive

terminal and the load or charger. The measured charge

accesses and configures the device.

The LTC2941 features programmable high and low thresh-

olds for accumulated charge. If a 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 LTC2941 requires only a single low value external

sense resistor to set the current range.

FEATURES

APPLICATIONS

Discharge

Total Charge Error vs

Differential Sense Voltage

+

TO HOST

CHARGER

LTC2941

AL/CC

SDA

LOAD

0.1μF

2941 TA01a

1-CELL

Li-Ion

100mΩ

SCL

GND

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

Technology Corporation. All other trademarks are the property of their respective owners.

0.1

–1.0

0

–0.5

–1.5

0.5

1.0

1

10

100

2941 TA01b

–2.0

2.0

1.5