MAX17044(2010) Просмотр технического описания (PDF) - Maxim Integrated

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MAX17044
(Rev.:2010)

Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert

Maxim Integrated 

19-4811; Rev 1; 4/10

EVAALVUAAILTAIOBNLEKIT

Compact, Low-Cost 1S/2S Fuel Gauges

with Low-Battery Alert

General Description

The MAX17043/MAX17044 are ultra-compact, low-cost,

host-side fuel-gauge systems for lithium-ion (Li+) batter-

ies in handheld and portable equipment. The MAX17043

is configured to operate with a single lithium cell and the

MAX17044 is configured for a dual-cell 2S pack.

The MAX17043/MAX17044 use a sophisticated Li+ bat-

tery-modeling scheme, called ModelGauge™ to track

the battery’s relative state-of-charge (SOC) continuously

over a widely varying charge/discharge profile. Unlike

traditional fuel gauges, the ModelGauge algorithm elim-

inates the need for battery relearn cycles and an exter-

nal current-sense resistor. Temperature compensation

is possible in the application with minimal interaction

between a µC and the device.

A quick-start mode provides a good initial estimate of

the battery’s SOC. This feature allows the IC to be

located on system side, reducing cost and supply

chain constraints on the battery. Measurement and esti-

mated capacity data sets are accessed through an I2C

interface. The MAX17043/MAX17044 are available in a

small, 2mm x 3mm, 8-pin TDFN lead-free package.

Applications

Smartphones

Portable DVD Players

MP3 Players

GPS Systems

Digital Still Cameras

Digital Video Cameras

Handheld and Portable

Applications

ModelGauge is a trademark of Maxim Integrated Products, Inc.

Features

♦ Host-Side or Battery-Side Fuel Gauging

1 Cell (MAX17043)

2 Cell (MAX17044)

♦ Precision Voltage Measurement

±12.5mV Accuracy to 5.00V (MAX17043)

±30mV Accuracy to 10.00V (MAX17044)

♦ Accurate Relative Capacity (RSOC) Calculated

from ModelGauge Algorithm

♦ No Offset Accumulation on Measurement

♦ No Full-to-Empty Battery Relearning Necessary

♦ No Sense Resistor Required

♦ External Alarm/Interrupt for Low-Battery Warning

♦ 2-Wire Interface

♦ Low Power Consumption

♦ Tiny, Lead-Free, 8-Pin, 2mm x 3mm TDFN

Package

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX17043G+U

-20°C to +70°C

8 TDFN-EP*

MAX17043G+T

-20°C to +70°C

8 TDFN-EP*

MAX17044G+U

-20°C to +70°C

8 TDFN-EP*

MAX17044G+T

-20°C to +70°C

8 TDFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

Simplified Operating Circuit

1kΩ

Li+

PROTECTION

1µF

CIRCUIT

CELL

VDD

ALRT

MAX17043

MAX17044

QSTRT

CTG

SDA

GND

SCL

EP

150Ω

4.7kΩ

SYSTEM

µP

INTERRUPT

I2C BUS

MASTER

10nF

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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