MAX17055
7μA 1-Cell Fuel Gauge with ModelGauge m5 EZ
General Description
The MAX17055 is a low 7μA operating current fuel gauge
that implements Maxim ModelGauge™ m5 EZ algorithm.
ModelGauge m5 EZ makes fuel gauge implementation
easy by eliminating battery characterization requirements
and simplifying host software interaction. The ModelGauge
m5 EZ robust algorithm provides tolerance against battery
diversity for most lithium batteries and applications.
ModelGauge m5 EZ algorithm combines the short-term
accuracy and linearity of a coulomb counter with the long-
term stability of a voltage-based fuel gauge, along with
temperature compensation to provide industry-leading
fuel gauge accuracy. The MAX17055 automatically com-
pensates for cell aging, temperature, and discharge rate,
and provides accurate state of charge (SOC in %) and
remaining capacity in milliampere-hours (mAh). As the
battery approaches the critical region near empty, the
ModelGauge m5 algorithm invokes a special compensa-
tion that eliminates any error. It also provides three meth-
ods for reporting the age of the battery: reduction in capac-
ity, increase in battery resistance, and cycle odometer.
The MAX17055 provides precision measurements of cur-
rent, voltage, and temperature. Temperature of the battery
pack is measured using an internal temperature mea-
surement or external thermistor. A 2-wire I
2
C interface
provides access to data and control registers.
The MAX17055 is available in a tiny, lead-free 0.4mm
pitch 1.4mm x 1.5mm, 9-pin WLP package, and a 2mm x
2.5mm, 10-pin TDFN package.
Benefits and Features
● ModelGauge m5 EZ
•
No Characterization Required for EZ Performance
•
Robust Against Battery Variation
•
Eliminates Error Near Empty Voltage
•
Eliminates Coulomb Counter Drift
•
Current, Temperature, and Age Compensated
•
Does Not Require Empty, Full, or Idle States
● Low 7μA Operating Current
● Wide Sense Resistor Range
•
1mΩ to 1000mΩ
•
PCB Metal Sensing + Temperature Compensation
● Supports Li+ and Variants Including LiFePO
4
● ±1°C Internal Temperature or Thermistor
● Dynamic Power Estimates Power Capability During
Discharge
● Time-to-Empty and Time-to-Full Estimation
•
Constant Power or Constant Current
● Predicts Remaining Capacity Under Theoretical Load
● Precision Measurement System
•
No Calibration Required
● Alert Indicator for Voltage, SOC, Temperature,
Current and 1% SOC Change
Applications
●
●
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●
●
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●
●
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Wearables, Smartwatches
Smartphones
Tablets, 2-in-1 Laptops
Bluetooth Headsets
Health and Fitness Monitors
Digital Still, Video, and Action Cameras
Medical Devices
Handheld Computers and Terminals
Wireless Speakers
Home and Building Automation, Sensors
Portable Game Players
Toys
ModelGauge is a trademark of Maxim Integrated Products, Inc.
Ordering Information
appears at end of data sheet.
19-8726; Rev 0; 1/17
MAX17055
7μA 1-Cell Fuel Gauge with ModelGauge m5 EZ
Absolute Maximum Ratings
BATT to CSP ...........................................................-0.3V to +6V
ALRT to CSP .........................................................-0.3V to +17V
REG to CSP .........................................................-0.3V to +2.2V
THRM to CSP.......................................... -0.3V to V
BATT
+ 0.3V
AIN to CSP .............................................. -0.3V to V
BATT
+ 0.3V
CSN to CSP ...............................................................-2V to +2V
SDA, SCL to CSP....................................................-0.3V to +6V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
WLP
Package Code
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
84ºC/W
W91N1+1
21-100129
Refer to
Application Note 1891
TDFN
Package Code
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
102ºC/W
2.9ºC/W
T102A2+1C
21-100013
90-100007
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated │ 3
MAX17055
7μA 1-Cell Fuel Gauge with ModelGauge m5 EZ
Electrical Characteristics (continued)
(V
BATT
= 2.3V to 4.9V, T
A
= -40ºC to 85ºC, typical values are T
A
= +25ºC, Limits are 100% tested at T
A
= +25°C. Limits over the
operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Specifications marked
GBD are guaranteed by design and not production tested.)
PARAMETER
Battery Detach Detection
Threshold
Battery Detach Detection
Threshold Hysteresis
Battery Detach
Comparator Delay
RESISTANCE AND LEAKAGE
Leakage Current, CSN,
ALRT, AIN, THRM
Input Pulldown Current
2-WIRE INTERFACE
SCL Clock Frequency
Bus Free Time Between
a STOP and START
Condition
Hold Time (Repeated)
START Condition
Low Period of SCL Clock
High Period of SCL Clock
Setup Time for a Repeated
START Condition
Data Hold Time
Data Setup Time
Rise Time of Both SDA and
SCL Signals
Fall Time of Both SDA and
SCL Signals
Setup Time for STOP
Condition
Spike Pulse Width
Suppressed by Input Filter
Capacitive Load for Each
Bus Line
SCL, SDA Input
Capacitance
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R
t
F
t
SU:STO
t
SP
C
B
C
BIN
6
(Note 6)
(Note 7)
(Notes 4, 5)
(Note 4)
(Note 3)
(Note 2)
0
1.3
0.6
1.3
0.6
0.6
0
100
5
5
0.6
50
400
300
300
0.9
400
kHz
μs
μs
μs
μs
μs
μs
ns
ns
ns
μs
ns
pF
pF
I
LEAK
I
PD
V
ALRT
< 15V
V
SDA
, V
SCL
= 0.4V
-1
0.05
0.2
+1
0.4
μA
μA
SYMBOL
V
DET
V
DET-HYS
t
TOFF
CONDITIONS
Observed between AIN and CSP, as a
fraction of the voltage between THRM and
CSP, AIN rising
AIN falling
AIN step from 70% to 100% of THRM volt-
age to ALRT falling, EnAIN = 1, FTHRM = 1
MIN
92.5
TYP
95
1
100
MAX
97.5
UNITS
%
%
μs
www.maximintegrated.com
Maxim Integrated │
5
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