MAX17048 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – Micropower 1-Cell/2-Cell Li+ ModelGauge ICs

19-6171; Rev 1; 4/12
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
relative 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 switches into a 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.
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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.