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PDF MAX17048 Data sheet ( Hoja de datos )
| Número de pieza | MAX17048 | |
| Descripción | Micropower 1-Cell/2-Cell Li+ ModelGauge ICs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX17048 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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EVALUATION KIT AVAILABLE
MAX17048 / MAX17049
Micropower 1-Cell/2-Cell Li+ ModelGauge ICs
General Description
The MAX17048/MAX17049 ICs are tiny, micropower
current fuel gauges for lithium-ion (Li+) batteries in hand-
held and portable equipment. The MAX17048 operates
with a single lithium cell and the MAX17049 with two
lithium cells in series.
The ICs use the sophisticated Li+ battery-modeling
algorithm ModelGaugeK to track the battery rela-
tive state-of-charge (SOC) continuously over widely
varying charge and discharge conditions. The
ModelGauge algorithm eliminates current-sense resistor
and battery-learn cycles required in traditional fuel gauges.
Temperature compensation is implemented using the
system microcontroller.
The ICs automatically detect when the battery enters a
low-current state and enters low-power 4FA hibernate
mode, while still providing accurate fuel gauging. The
ICs automatically exit hibernate mode when the system
returns to active state.
On battery insertion, the ICs debounce initial voltage
measurements to improve the initial SOC estimate,
thus allowing them to be located on system side. SOC,
voltage, and rate information is accessed using the I2C
interface. The ICs are available in a tiny 0.9mm x 1.7mm,
8-bump wafer-level package (WLP), or a 2mm x 2mm,
8-pin TDFN package.
Applications
Wireless Handsets
Smartphones/PDAs
Tablets and Handheld Computers
Portable Game Players
e-Readers
Digital Still and Video Cameras
Portable Medical Equipment
Ordering Information appears at end of data sheet.
Features and Benefits
S MAX17048: 1 Cell, MAX17049: 2 Cells
S Precision ±7.5mV/Cell Voltage Measurement
S ModelGauge Algorithm
Provides Accurate State-of-Charge
Compensates for Temperature/Load Variation
Does Not Accumulate Errors, Unlike Coulomb
Counters
Eliminates Learning
Eliminates Current-Sense Resistor
S Ultra-Low Quiescent Current
4µA Hibernate, 23µA Active
Fuel Gauges in Hibernate Mode
Automatically Enters and Exits Hibernate Mode
S Reports Charge and Discharge Rate
S Battery-Insertion Debounce
Best of 16 Samples to Estimate Initial SOC
S Programmable Reset for Battery Swap
2.28V to 3.48V Range
S Configurable Alert Indicator
Low SOC
1% Change in SOC
Battery Undervoltage/Overvoltage
VRESET Alert
S I2C Interface
S 8-Bit OTP ID Register (Contact Factory)
Simplified Operating Circuit
ONLY ONE
EXTERNAL
COMPONENT
MAX17048
VDD ALRT
CELL SDA
CTG SCL
GND QSTRT
SYSTEM
µP
ModelGauge is a trademark of Maxim Integrated Products,
Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6171; Rev 6; 10/14
1 page  
MAX17048 / MAX17049
Micropower 1-Cell/2-Cell Li+ ModelGauge ICs
Typical Operating Characteristics (continued)
(TA= +25NC, battery is Sanyo UF504553F, unless otherwise noted.)
EXIT HIBERNATE MODE
AUTOMATICALLY
600
VBATT
MAX17048 toc06 4.00
500 3.95
400 3.90
SOC ACCURACY TA = 20°C, HIBERNATE MODE
REFERENCE SOC
MODELGAUGE
ERROR
100 10MAX17048 toc07
75 5
300 3.85
200 IBATT
100
3.80
3.75
0
-100
0
IDD1
2
46
TIME (min)
IDD0
8
3.70
3.65
10
ZIGZAG PATTERN SOC ACCURACY (1/3)
REFERENCE SOC
MODELGAUGE
ERROR
100
MAX17048 toc08
10
50 0
25 -5
0 -10
-4 -2 0 2 4 6 8 10
TIME (Hr)
ZIGZAG PATTERN SOC ACCURACY (2/3)
REFERENCE SOC
MODELGAUGE
ERROR
100
MAX17048 toc09
10
75 5 75 5
50 0 50 0
25 -5 25 -5
0 -10
0 20 40 60 80 100
TIME (Hr)
ZIGZAG PATTERN SOC ACCURACY (3/3)
REFERENCE SOC
MODELGAUGE
ERROR
100
MAX17048 toc10
10
75 5
50 0
25 -5
0 -10
95 97 99 101 103 105
TIME (Hr)
Maxim Integrated
0 -10
0 2 4 6 8 10
TIME (Hr)
BATTERY-INSERTION DEBOUNCE/
OCV ACQUISITION
MAX17048 toc11
VCELL
0V OCV
0V
0V
0A
DEBOUNCE
BEGINS
DEBOUNCE
COMPLETED
4ms/div
5
5 Page 
MAX17048 / MAX17049
Micropower 1-Cell/2-Cell Li+ ModelGauge ICs
Table 2. Register Summary (continued)
ADDRESS
0x0C
0x14
0x16
REGISTER
NAME
CONFIG
VALRT
CRATE
0x18
VRESET/ID
0x1A
0x40 to 0x7F
0xFE
STATUS
TABLE
CMD
16-BIT LSb
—
—
0.208%/hr
—
—
—
—
DESCRIPTION
Compensation to optimize performance, sleep
mode, alert indicators, and configuration.
Configures the VCELL range outside of which
alerts are generated.
Approximate charge or discharge rate of the
battery.
Configures VCELL threshold below which
the IC resets itself, ID is a one-time factory-
programmable identifier.
Indicates overvoltage, undervoltage, SOC
change, SOC low, and reset alerts.
Configures battery parameters.
Sends POR command.
READ/WRITE DEFAULT
R/W 0x971C
R/W 0x00FF
R—
R/W 0x96__
R/W 0x01__
W—
R/W 0xFFFF
X
MSb
Quick-
Start
MSB—ADDRESS 0x06
EnSleep HibStat X
X
XX
LSb
Figure 8. MODE Register Format
X
MSb
LSB—ADDRESS 0x07
XXXXXX X
LSb
MODE Register (0x06)
The MODE register allows the system processor to send
special commands to the IC (see Figure 8).
• Quick-Start generates a first estimate of OCV and
SOC based on the immediate cell voltage. Use with
caution; see the Quick-Start section.
• EnSleep enables sleep mode. See the Sleep Mode
section.
• HibStat indicates when the IC is in hibernate mode
(read only).
VERSION Register (0x08)
The value of this read-only register indicates the
production version of the IC.
Maxim Integrated
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX17048.PDF ] | |
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