LTC4150IMS(RevA) Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LTC4150IMS
(Rev.:RevA)

Coulomb Counter/Battery Gas Gauge

Linear Technology 

LTC4150

Coulomb Counter/

Battery Gas Gauge

FEATURES

■ Indicates Charge Quantity and Polarity

■ ±50mV Sense Voltage Range

■ Precision Timer Capacitor or Crystal Not Required

■ 2.7V to 8.5V Operation

■ High Side Sense

■ 32.55Hz/V Charge Count Frequency

■ 1.5µA Shutdown Current

■ 10-Pin MSOP Package

U

APPLICATIO S

■ Battery Chargers

■ Palmtop Computers and PDAs

■ Cellular Telephones and Wireless Modems

DESCRIPTIO

The LTC®4150 measures battery depletion and charging in

handheld PC and portable product applications. The de-

vice 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.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

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

4150fa

1

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