LTC4150

1

4150fc

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Coulomb Counter/

Battery Gas Gauge

The LTC

in handheld PC and portable product applications. The

device monitors current through an external sense resistor

between the battery’s positive terminal and the battery’s

load or charger. A voltage-to-frequency converter trans-

forms the current sense voltage into a series of output

pulses at the interrupt pin. These pulses correspond to a

fixed quantity of charge flowing into or out of the battery.

The part also indicates charge polarity as the battery is

depleted or charged.

The LTC4150 is intended for 1-cell or 2-cell Li-Ion and

3-cell to 6-cell NiCd or NiMH applications.

Integral Nonlinearity, % of Full Scale

–

+

INT

4.7μF

CLR

CHG

DISCHG

POL

SHDN

4.7μF

CHARGER

LOAD

GND

LTC4150

μP

4150 TA01a

+

CURRENT SENSE VOLTAGE (mV)

–50

–25

0

25

50

4150 TA01b

0.5

0.4

0.3

0.2

0.1

–0.5

–0.4

–0.3

–0.2

–0.1

0

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

ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.