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 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 I
2
C interface. The MAX17043/MAX17044 are avail-
able in either a 0.4mm pitch 9-bump UCSP™ or 2mm x
3mm, 8-pin TDFN lead-free package.
●
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(Pb)-Free, 8-Pin, 2mm x 3mm TDFN
Package or Tiny 0.4mm Pitch 9-Bump UCSP Package
Ordering Information
PART
MAX17043G+U
MAX17043G+T
MAX17043X+
MAX17043X+T10
MAX17044G+U
MAX17044G+T
MAX17044X+
MAX17044X+T10
TEMP RANGE
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
PIN-PACKAGE
8 TDFN-EP*
8 TDFN-EP*
9 UCSP
9 UCSP
8 TDFN-EP*
8 TDFN-EP*
9 UCSP
9 UCSP
Applications
●
●
●
●
●
●
Smartphones, Tablets
Health and Fitness Monitors
Digital Still, Video, and Action Cameras
Medical Devices
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
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
1kΩ
CELL
V
DD
ALRT
150Ω
4.7kΩ
SYSTEM
µP
INTERRUPT
Li+
PROTECTION
CIRCUIT
1µF
QSTRT
CTG
GND
MAX17043
MAX17044
SDA
EP
SCL
10nF
I
2
C BUS
MASTER
19-4811; Rev 7; 1/17
MAX17043/MAX17044
1-Cell/2-Cell Fuel Gauge with
ModelGauge and Low-Battery Alert
Absolute Maximum Ratings
Voltage on CTG Pin Relative to V
GND
....................-0.3V to +12V
Voltage on CELL Pin Relative to V
GND
..................-0.3V to +12V
Voltage on All Other Pins Relative to V
GND
..............-0.3V to +6V
Operating Temperature Range..............................-40°C to +85°C
Storage Temperature Range
(T
A
= 0°C to +70°C (Note 10)).......................-55°C to +125°C
Lead Temperature (TDFN soldering only, 10s) ...............+300°C
Soldering Temperature (reflow) .......................................+260°C
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.
Electrical Characteristics Recommended DC Operating Conditions
(2.5V ≤ V
DD
≤ 4.5V, T
A
= -20°C to +70°C, unless otherwise noted.)
PARAMETER
Supply Voltage
Data I/O Pins
MAX17043 CELL Pin
MAX17044 CELL Pin
SYMBOL
V
DD
(Note 1)
SCL, SDA,
QSTRT, (Note 1)
ALRT
V
CELL
V
CELL
(Note 1)
(Note 1)
CONDITIONS
MIN
+2.5
-0.3
-0.3
-0.3
TYP
MAX
+4.5
+5.5
+5.0
+10.0
UNITS
V
V
V
V
DC Electrical Characteristics
(2.5V ≤ V
DD
≤ 4.5V, T
A
= -20°C to +70°C, unless otherwise noted. Contact Maxim for V
DD
greater than 4.5V.)
PARAMETER
Active Current
Sleep-Mode Current (Note 2)
SYMBOL
I
ACTIVE
I
SLEEP
V
DD
= 2.0V
V
DD
= 3.6V at +25°C
Time-Base Accuracy
MAX17043 Voltage-
Measurement Error
MAX17044 Voltage-
Measurement Error
CELL Pin Input Impedance
Input Logic-High:
SCL, SDA, QSTRT
Input Logic-Low:
SCL, SDA, QSTRT
Output Logic-Low: SDA
Output Logic-Low:
ALRT
Pulldown Current: SCL, SDA
Input Capacitance: SCL, SDA
Bus Low Timeout
Mode Transition
t
ERR
T
A
= 0°C to +70°C (Note 10)
T
A
= -20°C to +70°C
T
A
= +25°C, V
IN
= V
DD
V
GERR
T
A
= +25°C, 5.0V < V
IN
< 9.0V
5.0 < V
IN
< 9.0
R
CELL
V
IH
V
IL
V
OL
V
OL-ALRT
I
PD
C
BUS
t
SLEEP
t
TRAN
(Note 3)
(Note 4)
1.75
(Note 1)
(Note 1)
I
OL
= 4mA (Note 1)
I
OL-ALRT
= 2mA (Note 1)
V
DD
= 4.5V, V
PIN
= 0.4V
0.2
50
2.5
1
-1
-2
-3
-12.5
-30
-30
-60
15
1.4
0.5
0.4
0.4
CONDITIONS
MIN
TYP
50
0.5
1
MAX
75
1.0
3
+1
+2
+3
+12.5
+30
+30
+60
mV
mV
MΩ
V
V
V
V
µA
pF
s
ms
%
UNITS
µA
µA
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Maxim Integrated
│
2
MAX17043/MAX17044
1-Cell/2-Cell Fuel Gauge with
ModelGauge and Low-Battery Alert
Electrical Characteristics: 2-Wire Interface
(2.5V ≤ V
DD
≤ 4.5V, T
A
= -20°C to +70°C, unless otherwise noted.)
PARAMETER
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 Widths Suppressed
by Input Filter
Capacitive Load for Each
Bus Line
SCL, SDA Input Capacitance
Note
Note
Note
Note
Note
Note
Note
1:
2:
3:
4:
5:
6:
7:
SYMBOL
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
(Note 8)
(Note 9)
(Notes 6, 7)
(Note 6)
(Note 5)
(Note 5)
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0.6
0
100
20 +
0.1C
B
20 +
0.1C
B
0.6
0
50
400
60
300
300
0.9
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
ns
pF
pF
All voltages are referenced to GND.
SDA, SCL = GND; QSTRT,
ALRT
idle.
The MAX17043/MAX17044 enter Sleep mode 1.75s to 2.5s after (SCL < V
IL
) AND (SDA < V
IL
).
Time to enter sleep after Sleep command is sent. Time to exit sleep on rising edge of SCL or SDA.
f
SCL
must meet the minimum clock low time plus the rise/fall times.
The maximum t
HD:DAT
has only to be met if the device does not stretch the low period (t
LOW
) of the SCL signal.
This device internally provides a hold time of at least 75ns for the SDA signal (referred to the V
IHMIN
of the SCL signal) to
bridge the undefined region of the falling edge of SCL.
Note 8:
Filters on SDA and SCL suppress noise spikes at the input buffers and delay the sampling instant.
Note 9:
C
B
—total capacitance of one bus line in pF.
Note 10:
Applies to 8-pin TDFN-EP package type only.
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Maxim Integrated
│
3
MAX17043/MAX17044
1-Cell/2-Cell Fuel Gauge with
ModelGauge and Low-Battery Alert
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
MAX17043/4 toc01
100
80
60
40
20
0
T
A
= -20°C
T
A
= +70°C
100
90
STATE OF CHARGE (%)
80
70
60
50
40
30
20
10
0
SIMPLE C/2 RATE CYCLES*
SOC ACCURACY
MAX17043/
MAX17044 SOC:
DASHED LINE
MAX17043/4 toc02
10
8
6
2
0
-2
-4
-6
SOC ERROR (%)
4
QUIESCENT CURRENT (µA)
T
A
= +25°C
REFERENCE SOC:
SOLID LINE
0
2
4
6
TIME (h)
ERROR (%)
8
10
12
-8
-10
0
1
2
V
DD
(V)
3
4
5
90
STATE OF CHARGE (%)
80
70
60
50
40
30
20
10
0
0
VOLTAGE ADC ERROR (mV)
MAX17043/
MAX17044 SOC:
DASHED LINE
8
6
SOC ERROR (%)
4
2
0
-2
-4
15
10
5
0
-5
-10
-15
-20
-40
V
CELL
= 4.2V
V
CELL
= 3.0V
REFERENCE SOC:
SOLID LINE
2
4
6
ERROR (%)
-6
-8
-10
V
CELL
= 3.6V
8 10 12 14 16 18 20 22
TIME (hr)
-15
10
35
60
85
TEMPERATURE (°C)
100
90
STATE OF CHARGE (%)
80
70
60
50
40
30
20
10
0
0
C/2 RATE ZIGZAG PATTERN*
SOC ACCURACY
MAX17043/MAX17044 SOC:
DASHED LINE
MAX17043/4 toc05
10
8
6
2
0
-2
-4
-6
-8
-10
SOC ERROR (%)
4
ERROR (%)
REFERENCE SOC:
SOLID LINE
4
8
12
TIME (hr)
16
20
22
* Sample accuracy with custom configuration data programmed into the IC.
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Maxim Integrated
│
4
MAX17043/4 toc04
100
SIMPLE C/4 RATE CYCLES*
SOC ACCURACY
MAX17043/4 toc03
10
20
MAX17043 VOLTAGE ADC ERROR
vs. TEMPERATURE
MAX17043/MAX17044
1-Cell/2-Cell Fuel Gauge with
ModelGauge and Low-Battery Alert
Pin Configurations
TOP VIEW
SDA SCL QSTRT
ALRT
8
7
6
5
TOP VIEW
(BUMPS ON BOTTOM)
1
MAX17043
MAX17044
2
SCL
3
CTG
+
MAX17043
MAX17044
A
SDA
+
1
2
3
4
B
QSTRT
N.C.
CELL
CTG CELL V
DD
GND
C
ALRT
V
DD
GND
TDFN
(2mm
x
3mm)
UCSP
Pin Description
PIN
UCSP
A1
A2
A3
B1
B2
B3
C1
C2
C3
—
2
5
3
4
—
TDFN
8
7
1
6
NAME
SDA
SCL
CTG
QSTRT
N.C.
CELL
ALRT
V
DD
GND
EP
FUNCTION
Serial Data Input/Output. Open-drain 2-wire data line. Connect this pin to the DATA signal of the
2-wire interface. This pin has a 0.2µA typical pulldown to sense disconnection.
Serial Clock Input. Input only 2-wire clock line. Connect this pin to the CLOCK signal of the 2-wire
interface. This pin has a 0.2µA typical pulldown to sense disconnection.
Connect to Ground. Connect to VSS during normal operation.
Quick-Start Input. Allows reset of the device through hardware. Connect to GND if not used.
No connect. Do not connect.
Battery Voltage Input. The voltage of the cell pack is measured through this pin.
Alert Output. Active-low interrupt signaling low state of charge. Connect to interrupt input of the
system microprocessor.
Power-Supply Input. 2.5V to 4.5V input range. Connect to system power through a decoupling
network. Connect a 10nF typical decoupling capacitor close to pin.
Ground. Connect to the negative power rail of the system.
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