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MAX17040

1-Cell/2-Cell Fuel Gauge with ModelGauge

Maxim Integrated 

MAX17040/MAX17041

EVALUATION KIT AVAILABLE

1-Cell/2-Cell Fuel Gauge with ModelGauge

General Description

The MAX17040/MAX17041 are ultra-compact, low-cost,

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

ies in handheld and portable equipment. The MAX17040

is configured to operate with a single lithium cell and the

MAX17041 is configured for a dual-cell 2S pack.

The MAX17040/MAX17041 use a sophisticated Li+

battery-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 elimi-

nates the need for battery relearn cycles and an external

current-sense resistor. Temperature compensation is pos-

sible in the application with minimal interaction between a

μC and the device.

The IC can be located on the system side, reducing cost

and supply chain constraints on the battery. Measurement

and estimated capacity data sets are accessed through

an I2C interface. The MAX17040/MAX17041 are avail-

able in either a 0.4mm pitch 9-bump UCSP™ or 2mm x

3mm, 8-pin TDFN lead-free package.

Applications

●● Smartphones, Tablets

●● Health and Fitness

Monitors

●● Medical Devices

●● Digital Still, Video, and

Action Cameras

●● Handheld Computers

and Terminals

●● Wireless Speakers

ModelGauge is a trademark of Maxim Integrated Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.

Visit www.maximintegrated.com/products/patents for product

patent marking information.

Simple Fuel Gauge Circuit Diagram

Features

●● Host-Side or Battery-Side Fuel Gauging

• 1 Cell (MAX17040)

• 2 Cell (MAX17041)

●● Precision Voltage Measurement

• ±12.5mV Accuracy to 5.00V (MAX17040)

• ±30mV Accuracy to 10.00V (MAX17041)

●● Accurate Relative Capacity (RSOC) Calculated from

ModelGauge Algorithm

●● No Offset Accumulation on Measurement

●● No Full-to-Empty Battery Relearning Necessary

●● No Sense Resistor Required

●● 2-Wire Interface

●● Low Power Consumption

●● Tiny, Lead(Pb)-Free, 8-Pin, 2mm x 3mm TDFN

Package or Tiny 0.4mm Pitch 9-Bump UCSP Package

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX17040G+U

-20°C to +70°C 8 TDFN-EP*

MAX17040G+T

-20°C to +70°C 8 TDFN-EP*

MAX17040X+U

-20°C to +70°C 9 UCSP

MAX17040X+T10 -20°C to +70°C 9 UCSP

MAX17041G+U

-20°C to +70°C 8 TDFN-EP*

MAX17041G+T

-20°C to +70°C 8 TDFN-EP*

MAX17041X+

-20°C to +70°C 9 UCSP

MAX17041X+T10 -20°C to +70°C 9 UCSP

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

T = Tape and reel.

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

Li+

PROTECTION

CIRCUIT

1kΩ

150Ω

CELL

VDD

MAX17040

MAX17041

SYSTEM

µP

SEO

EO

CTG

SDA

GND EP SCL

I2C BUS

MASTER

1µF

10nF

19-5210; Rev 9; 10/16

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