EVALUATION KIT AVAILABLE MAX17048/MAX17049 3A 1-Cell/2-Cell Fuel Gauge with ModelGauge General Description Features and Benefits The MAX17048/MAX17049 ICs are tiny, micropower cur- MAX17048: 1 Cell, MAX17049: 2 Cells rent fuel gauges for lithium-ion (Li+) batteries in handheld Precision 7.5mV/Cell Voltage Measurement and portable equipment. The MAX17048 operates with ModelGauge Algorithm a single lithium cell and the MAX17049 with two lithium Provides Accurate State-of-Charge cells in series. Compensates for Temperature/Load Variation The ICs use the sophisticated Li+ battery-modeling algo- Does Not Accumulate Errors, Unlike Coulomb rithm ModelGauge to track the battery relative state-of- Counters charge (SOC) continuously over widely varying charge Eliminates Learning and discharge conditions. The ModelGauge algorithm Eliminates Current-Sense Resistor eliminates current-sense resistor and battery-learn cycles Ultra-Low Quiescent Current required in traditional fuel gauges. Temperature compen- 3A Hibernate, 23A Active sation is implemented using the system microcontroller. Fuel Gauges in Hibernate Mode The ICs automatically detect when the battery enters a Automatically Enters and Exits Hibernate Mode low-current state and enters low-power 3A hibernate Reports Charge and Discharge Rate mode, while still providing accurate fuel gauging. The Battery-Insertion Debounce ICs automatically exit hibernate mode when the system Best of 16 Samples to Estimate Initial SOC returns to active state. Programmable Reset for Battery Swap On battery insertion, the ICs debounce initial voltage 2.28V to 3.48V Range measurements to improve the initial SOC estimate, thus allowing them to be located on system side. SOC, Configurable Alert Indicator 2 voltage, and rate information is accessed using the I C Low SOC interface. The ICs are available in a tiny 0.9mm x 1.7mm, 1% Change in SOC 8-bump wafer-level package (WLP), or a 2mm x 2mm, Battery Undervoltage/Overvoltage 8-pin TDFN package. VRESET Alert 2 I C Interface Applications 8-Bit OTP ID Register (Contact Factory) Smartphones, Tablets Smartwatches, Wearables Bluetooth Headsets Simple Fuel-Gauge Circuit Diagram Health and Fitness Monitors Digital Still, Video, and Action Cameras Medical Devices Handheld Computers and Terminals MAX17048 Wireless Speakers Home and Building Automation, Sensors V ALRT DD SYSTEM CELL SDA P ONLY ONE CTG SCL EXTERNAL COMPONENT QSTRT GND Ordering Information appears at end of data sheet. ModelGauge is a trademark of Maxim Integrated Products, Inc. 19-6171 Rev 7 11/16MAX17048/MAX17049 3A 1-Cell/2-Cell Fuel Gauge with ModelGauge Absolute Maximum Ratings CELL to GND ........................................................-0.3V to +12V Storage Temperature Range ............................ -55C to +125C All Other Pins to GND .............................................-0.3V to +6V Lead Temperature (TDFN only) (soldering, 10s) ............+300C Continuous Sink Current, SDA, ALRT ...............................20mA Soldering Temperature (reflow).......................................+260C Operating Temperature Range ........................... -40C to +85C 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 (V = 2.5V to 4.5V, T = -20C to +70C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 2) 2.5 4.5 V DD Configuration range, in 40mV steps 2.28 3.48 V Fuel-Gauge SOC Reset V RST (VRESET Register) Trimmed at 3V 2.85 3.0 3.15 V SCL, SDA, Data I/O Pins (Note 2) -0.3 +5.5 V ALRT Sleep mode, T +50C 0.5 2 A Hibernate mode, reset comparator 3 5 I disabled (VRESET.Dis = 1) DD0 Supply Current A Hibernate mode, reset comparator 4 enabled (VRESET.Dis = 0) I Active mode 23 40 DD1 Time Base Accuracy t Active, hibernate modes (Note 3) -3.5 1 +3.5 % ERR Active mode 250 ms ADC Sample Period Hibernate mode 45 s V = 3.6V, T = +25C (Note 4) -7.5 +7.5 CELL A Voltage Error V mV/cell ERR -20 +20 Voltage-Measurement Resolution 1.25 mV/cell MAX17048: V pin 2.5 5 DD Voltage-Measurement Range V MAX17049: CELL pin 5 10 SDA, SCL, QSTRT Input V 1.4 V IH Logic-High SDA, SCL, QSTRT Input V 0.5 V IL Logic-Low SDA, ALRT Output V I = 4mA 0.4 V OL OL Logic-Low SDA, SCL Bus I V = V = 0.4V (Note 5) 0.2 0.4 A PD SDA SCL Low-Detection Current Bus Low-Detection Timeout t (Note 6) 1.75 2.5 s SLEEP Maxim Integrated 2 www.maximintegrated.com