LTC4150IMS Просмотр технического описания (PDF) - Linear Technology

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LTC4150IMS

Coulomb Counter/Battery Gas Gauge

Linear Technology 

FEATURES

n Indicates Charge Quantity and Polarity

n ±50mV Sense Voltage Range

n Precision Timer Capacitor or Crystal Not Required

n 2.7V to 8.5V Operation

n High Side Sense

n 32.55Hz/V Charge Count Frequency

n 1.5μA Shutdown Current

n 10-Pin MSOP Package

APPLICATIONS

n Battery Chargers

n Palmtop Computers and PDAs

n Cellular Telephones and Wireless Modems

TYPICAL APPLICATION

LTC4150

Coulomb Counter/

Battery Gas Gauge

DESCRIPTION

The LTC®4150 measures battery depletion and charging

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.

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.

RSENSE

+

CHARGER

LOAD

4.7μF

4.7μF

SENSE– SENSE+ VDD

CF+

INT

CF–

LTC4150 CLR CHG

POL

GND SHDN

RL RL

μP

DISCHG

4150 TA01a

Integral Nonlinearity, % of Full Scale

0.5

0.4

0.3

0.2

0.1

0

–0.1

–0.2

–0.3

–0.4

–0.5

–50

–25

0

25

50

CURRENT SENSE VOLTAGE (mV)

4150 TA01b

4150fc

1

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