MAX17040_11 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Compact, Low-Cost 1S/2S Fuel Gauges

19-5210; Rev 6; 8/11
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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
either a 0.4mm pitch 9-bump UCSP™ or 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.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
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.
Simplified Operating Circuit
Li+
PROTECTION
CIRCUIT
1kΩ
150Ω
CELL
V_DD
SYSTEM
μP
MAX17040
MAX17041
SEO
EO
CTG
SDA
GND _EP SCL
I²C BUS
MASTER
1μF
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.