MAX17047 Datasheet PDF - Maxim Integrated


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MAX17047
Maxim Integrated

Part Number MAX17047
Description 1-Cell Fuel Gauge
Page 30 Pages

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MAX17047/MAX17050
1-Cell Fuel Gauge with ModelGauge m3
General Description
The MAX17047/MAX17050 incorporate the Maxim
ModelGauge™ m3 algorithm that combines the excellent
short-term accuracy and linearity of a coulomb counter
with the excellent long-term stability of a voltage-based fuel
gauge, along with temperature compensation to provide
industry-leading fuel-gauge accuracy. ModelGauge m3
cancels offset accumulation error in the coulomb counter,
while providing better short-term accuracy than any purely
voltage-based fuel gauge. Additionally, the ModelGauge
m3 algorithm does not suffer from abrupt corrections that
normally occur in coulomb-counter algorithms, since tiny
continual corrections are distributed over time.
The device automatically compensates for aging, temper-
ature, and discharge rate and provides accurate state of
charge (SOC) in mAh or %, as well as time-to-empty over
a wide range of operating conditions. The device provides
two methods for reporting the age of the battery: reduction
in capacity and cycle odometer.
The device provides precision measurements of current,
voltage, and temperature. Temperature of the battery
pack is measured using an external thermistor supported
by ratiometric measurements on an auxiliary input. A
2-wire (I2C) interface provides access to data and control
registers. The MAX17047 is available in a lead(Pb)-free,
3mm x 3mm, 10-pin TDFN package. The MAX17050 is
available in a 0.4mm pitch 9-bump WLP package.
Applications
● Smartphones, Tablets
● Health and Fitness
Monitors
Digital Still, Video and
Action Cameras
● Medical Devices
● Handheld Computers
and Terminals
● Wireless Speakers
Simple Fuel-Gauge Circuit Diagram
Features
● Accurate Battery-Capacity and Time-To-Empty
Estimation
• Temperature, Age, and Rate Compensated
• Does Not Require Empty, Full, or Idle States to
Maintain Accuracy
● Precision Measurement System
• No Calibration Required
● ModelGauge m3 Algorithm
Long-Term Influence by Voltage Fuel Gauge
Cancels Coulomb-Counter Drift
Short-Term Influence by Coulomb Counter
Provides Excellent Linearity
• Adapts to Cell Characteristics
● External Temperature-Measurement Network
• Actively Switched Thermistor Resistive Divider
Reduces Current Consumption
● Low Quiescent Current
25μA Active, < 0.5μA Shutdown
Alert Indicator for SOC, Voltage, Temperature, and
Battery Removal/Insertion Events
● AtRate Estimation of Remaining Capacity
● 2-Wire (I2C) Interface
● Tiny, Lead(Pb)-Free, 3mm x 3mm, 10-Pin TDFN
Package or Tiny 0.4mm Pitch 9-Bump WLP Package
Ordering Information appears at end of data sheet.
BATTERY PACK
PK+
OPTIONAL
10k
T
PROTECTION
OPTIONAL
10k
NTC
THERMISTOR
PK-
OPTIONAL
10nF
0.1µF
ModelGauge is a trademark of Maxim Integrated Products, Inc.
THRM
AIN
REG
0.1µF
VBATT
SYSTEM
VTT
(MAX17047 ONLY)
ALRT
MAX17047
MAX17050
SDA
SCL
CSP EP
10m
RSNS
CSN
HOST
µP
19-6008; Rev 7; 11/16



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MAX17047/MAX17050
1-Cell Fuel Gauge with ModelGauge m3
Absolute Maximum Ratings
VBATT, SDA, SCL, ALRT to CSP.............................-0.3V to +6V
REG to CSP..........................................................-0.3V to +2.2V
VTT to CSP...............................................................-0.3V to +6V
THRM, AIN to CSP.....................................-0.3V to (VTT + 0.3V)
CSN to CSP................................................................-2V to +2V
Continuous Sink Current (VTT)...........................................20mA
Continuous Sink Current (SCL, SDA, ALRT)......................20mA
Continuous Power Dissipation (TA = +70°C)
TDFN (derate 24.4mW/°C above +70°C)................1951.2mW
WLP (derate 11.9mW/°C above +70°C)....................952.0mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -55°C to +125°C
Lead Temperature (soldering 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.
Package Thermal Characteristics (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (θJA)...........41°C/W
Junction-to-Case Thermal Resistance (θJC)..................9°C/W
WLP
Junction-to-Ambient Thermal Resistance (θJA)...........84°C/W
Note 1: 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.
Electrical Characteristics
(VBATT = 2.5V to 4.5V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Supply Voltage
Supply Current
REG Regulation Voltage
Measurement Error, VBATT
Measurement Resolution, VBATT
VBATT Measurement Range
Input Resistance CSN, AIN
Ratiometric Measurement
Accuracy, AIN
SYMBOL
VBATT
IDD0
IDD1
VREG
VGERR
CONDITIONS
(Note 3)
Shutdown mode, TA ≤ +50°C
Active mode, average current
TA = +25°C
VLSb
VFS
TGERR
MIN TYP MAX
2.5 4.5
0.5 2
25 42
1.5 1.9
-7.5 +7.5
-20 +20
0.625
2.5 4.98
15
-0.5 +0.5
Ratiometric Measurement
Resolution, AIN
Current Register Resolution
Current Full-Scale Magnitude
Current Offset Error
TLSb
ILSb
IFS
IOERR
0.0244
1.5625
±51.2
±1.5
Current Gain Error
IGERR
-1 +1
Time-Base Accuracy
tERR
VDD = 3.6V at TA = +25°C
TA = 0°C to +50°C
TA = -20°C to +70°C
-1 +1
-2.5 +2.5
-3.5 +3.5
UNITS
V
µA
V
mV
mV
V
MΩ
%
% Full
Scale
µV
mV
µV
% of
Reading
%
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MAX17047/MAX17050
1-Cell Fuel Gauge with ModelGauge m3
Electrical Characteristics (continued)
(VBATT = 2.5V to 4.5V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
THRM Output Drive
THRM Precharge Time
SDA, SCL, ALRT Input
Logic High
SYMBOL
tPRE
CONDITIONS
IOUT = 0.5mA
VIH
MIN TYP
VTT - 0.1
8.48
1.5
MAX
SDA, SCL, ALRT Input Logic Low
SDA, ALRT Output Logic Low
SDA, ALRT Pulldown Current
ALRT Leakage
THRM Operating Range
Battery-Removal Detection
Threshold—VAIN Rising
Battery-Removal Detection
Threshold—VAIN Falling
VIL
VOL
IPD
VDETR
VDETF
IOL = 4mA
Active mode, VSDA = 0.4V, VALRT = 0.4V
VTHRM - VAIN
VTHRM - VAIN
0.5
0.4
0.05 0.2
0.4
1
2.5 VTT
40 125 200
70 150 230
Battery-Removal Detection
Comparator Delay
tTOFF
VAIN step from 70% to 100% of VTHRM to
ALRT falling; Alrtp = logic 0;
EnAIN = logic 1; FTHRM = logic 1
100
External AIN Capacitance
RTHM = 10kΩ NTC
100
Electrical Characteristics (2-Wire Interface)
(2.5V ≤ VBATT ≤ 4.5V, TA = -20°C to +70°C.) (Note 2)
PARAMETER
SCL Clock Frequency
Bus Free Time Between a STOP
and START Condition
SYMBOL
fSCL
(Note 4)
tBUF
CONDITIONS
Hold Time (Repeated)
START Condition
Low Period of SCL Clock
High Period of SCL Clock
Setup Time for a Repeated
START Condition
tHD:STA
tLOW
tHIGH
tSU:STA
(Note 5)
Data Hold Time
Data Setup Time
Rise Time of Both SDA and SCL
Signals
tHD:DAT
tSU:DAT
tR
(Notes 6, 7)
(Note 6)
MIN TYP MAX
0 400
1.3
0.6
1.3
0.6
0.6
0
100
20 +
0.1CB
0.9
300
UNITS
V
ms
V
V
V
µA
µA
V
mV
mV
µs
nF
UNITS
kHz
µs
µs
µs
µs
µs
µs
ns
ns
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MAX17047/MAX17050
1-Cell Fuel Gauge with ModelGauge m3
Electrical Characteristics (2-Wire Interface) (continued)
(2.5V ≤ VBATT ≤ 4.5V, TA = -20°C to +70°C.) (Note 2)
PARAMETER
Fall Time of Both SDA and SCL
Signals
Setup Time for STOP Condition
Spike Pulse Widths
Suppressed by Input Filter
SYMBOL
tF
tSU:STO
tSP (Note 8)
CONDITIONS
MIN TYP MAX UNITS
20 +
0.1CB
300 ns
0.6 µs
0 50 ns
Capacitive Load for Each Bus
Line
CB (Note 9)
400 pF
SCL, SDA Input Capacitance
CBIN
60 pF
Note 2: Specifications are 100% tested at TA = +25°C. Limits over the operating range are guaranteed by design and
characterization.
Note 3: All voltages are referenced to CSP.
Note 4: Timing must be fast enough to prevent the device from entering shutdown mode due to bus low for a period > 45s minimum.
Note 5: fSCL must meet the minimum clock low time plus the rise/fall times.
Note 6: The maximum tHD:DAT has only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 7: This device internally provides a hold time of at least 100ns for the SDA signal (referred to the minimum VIH 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: CB—total capacitance of one bus line in pF.
I2C Bus Timing Diagram
SDA
tF
tLOW
tR
tSU:DAT
SCL
tHD:STA
S tHD:DAT
Figure 1. I2C Bus Timing Diagram
tF
tHD:STA
tSU:STA
Sr
tSP tR
tBUF
tSU:STO
P
S
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Maxim Integrated 4




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