MAX17048

Part: MAX17048/MAX17049 — Maxim Integrated Type: Micropower Current Fuel Gauge Description: Tiny, micropower current fuel gauges for lithium-ion batteries, operating with one (MAX17048) or two (MAX17049) cells, using the ModelGauge algorithm to track relative state-of-charge (SOC) continuously.

Operating Conditions:

• Supply voltage: 2.5V to 4.5V
• Operating temperature: -40°C to +85°C
• I2C Clock Frequency: 0 to 400 kHz

Absolute Maximum Ratings:

• Max CELL to GND voltage: +12V
• Max All Other Pins to GND voltage: +6V
• Max continuous sink current (SDA, ALRT): 20mA
• Max storage temperature: +125°C

Key Specs:

• Supply Current (Hibernate mode, reset comparator disabled): 3 μA (typ)
• Supply Current (Active mode): 23 μA (typ)
• Voltage Error: ±7.5 mV/cell (VCELL = 3.6V, TA = +25°C)
• Voltage-Measurement Resolution: 1.25 mV/cell
• Voltage-Measurement Range (MAX17048): 2.5V to 5V
• Voltage-Measurement Range (MAX17049): 5V to 10V
• Fuel-Gauge SOC Reset (VRESET Register): 2.28V to 3.48V (configuration range)
• ADC Sample Period (Active mode): 250 ms

Features:

• MAX17048: 1 Cell, MAX17049: 2 Cells
• ModelGauge Algorithm for accurate State-of-Charge
• Eliminates current-sense resistor and learning cycles
• Automatically enters and exits 3μA hibernate mode
• Reports charge and discharge rate
• Battery-insertion debounce with best of 16 samples for initial SOC
• Configurable Alert Indicator (Low SOC, 1% Change in SOC, Battery Undervoltage/Overvoltage, VRESET Alert)
• I2C Interface

Applications:

• Smartphones, Tablets
• Smartwatches, Wearables
• Bluetooth Headsets
• Health and Fitness Monitors
• Digital Still, Video, and Action Cameras
• Medical Devices
• Handheld Computers and Terminals
• Wireless Speakers
• Home and Building Automation, Sensors

Package:

• 8-bump wafer-level package (WLP) (0.9mm x 1.7mm)
• 8-pin TDFN package (2mm x 2mm)

• MAX17048: 1 Cell, MAX17049: 2 Cells
• Precision ±7.5mV/Cell Voltage Measurement
• 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
• Ultra-Low Quiescent Current
• 3μA Hibernate, 23μA Active
• Fuel Gauges in Hibernate Mode
• Automatically Enters and Exits Hibernate Mode
• Reports Charge and Discharge Rate
• Battery-Insertion Debounce
• Best of 16 Samples to Estimate Initial SOC
• Programmable Reset for Battery Swap
• 2.28V to 3.48V Range
• Configurable Alert Indicator
• Low SOC
• 1% Change in SOC
• Battery Undervoltage/Overvoltage
• VRESET Alert
• I 2 C Interface
• 8-Bit OTP ID Register (Contact Factory)

• Smartphones, Tablets
• Smartwatches, Wearables
• Bluetooth Headsets
• Health and Fitness Monitors
• Digital Still, Video, and Action Cameras
• Medical Devices
• Handheld Computers and Terminals
• Wireless Speakers
• Home and Building Automation, Sensors

Ordering Information appears at end of data sheet.

ModelGauge is a trademark of Maxim Integrated Products, Inc.

(V DD = 2.5V to 4.5V, T A = -20°C to +70°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)

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• All Other Pins to GND.............................................-0.3V to +6V

• Continuous Sink Current, SDA, ALRT ...............................20mA

• Operating Temperature Range........................... -40°C to +85°C

• Lead Temperature (TDFN only) (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.

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

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Data is returned beginning with the MSb of the data in MAddr. Because the address is automatically incremented after the LSb of each byte is returned, the MSb of the data at address MAddr + 1 is available to the host immediately after the acknowledgment of the data at address MAddr. If the bus master continues to read beyond address FFh, the ICs output data values of FFh. Addresses labeled Reserved in the memory map return undefined data. The bus master terminates the read transaction at any byte boundary by issuing a no acknowledge followed by a STOP or Repeated START.