MAX17040 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Compact, Low-Cost 1S/2S Fuel Gauges

19-5210; Rev 3; 4/10
EVAALVUAAILTAIOBNLEKIT
Compact, Low-Cost 1S/2S Fuel Gauges
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+ 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 MAX17040/MAX17041 are available in a
small, 2mm x 3mm, 8-pin TDFN lead-free package.
Applications
Smart Phones
MP3 Players
Digital Still Cameras
Digital Video Cameras
Portable DVD Players
GPS Systems
Handheld and Portable
Applications
ModelGauge is a trademark of Maxim Integrated Products, Inc.
Pin Configuration
Features
o Host-Side or Battery-Side Fuel Gauging
1 Cell (MAX17040)
2 Cell (MAX17041)
o Precision Voltage Measurement
±12.5mV Accuracy to 5.00V (MAX17040)
±30mV Accuracy to 10.00V (MAX17041)
o Accurate Relative Capacity (RSOC) Calculated
from ModelGauge Algorithm
o No Offset Accumulation on Measurement
o No Full-to-Empty Battery Relearning Necessary
o No Sense Resistor Required
o 2-Wire Interface
o Low Power Consumption
o Tiny, Lead-Free, 8-Pin, 2mm x 3mm TDFN
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*
MAX17041G+U
-20°C to +70°C
8 TDFN-EP*
MAX17041G+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
TOP VIEW
SDA SCL EO SEO
8765
MAX17040
MAX17041
+
1 234
CTG CELL V_DD GND
TDFN
(2mm × 3mm)
150Ω
Li+
PROTECTION
CIRCUIT
1µF
CELL
V_DD
MAX17040
MAX17041
SEO
EO
CTG
SDA
GND _EP SCL
150Ω
SYSTEM
µP
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.