1-Cell/2-Cell Fuel Gauge with ModelGauge and Low-Battery Alert

Smarten Up Your Dumb Battery!

Please check latest availability status for a specific part variant.


The MAX17043/MAX17044 are ultra-compact, low-cost, host-side fuel-gauge systems for lithium-ion (Li+) batteries in handheld and portable equipment. The MAX17043 is configured to operate with a single lithium cell and the MAX17044 is configured for a dual-cell 2S pack.

The MAX17043/MAX17044 use a sophisticated Li+ battery-modeling scheme, called ModelGauge™ to track the battery's relative state-of-charge (SOC) continuously over a widely varying charge/discharge profile. Unlike traditional fuel gauges, the ModelGauge algorithm eliminates the need for battery relearn cycles and an external current-sense resistor. Temperature compensation is possible in the application with minimal interaction between a µC and the device.

The IC can be located on the system side, reducing cost and supply chain constraints on the battery. Measurement and estimated capacity data sets are accessed through an I2C interface. The MAX17043/MAX17044 are available in either a 0.4mm pitch 9-bump UCSP™ or 2mm x 3mm, 8-pin TDFN lead-free package.
Ultra-compact, low-cost, host-side fuel-gauge systems for lithium-ion (Li+) batteries in handheld and portable equipment| Simplified Operating Circuit Ultra-compact, low-cost, host-side fuel-gauge systems for lithium-ion (Li+) batteries in handheld and portable equipment| Simplified Operating Circuit Enlarge+

Key Features

  • Host-Side or Battery-Side Fuel Gauging
    • 1 Cell (MAX17043)
    • 2 Cell (MAX17044)
  • Precision Voltage Measurement
    • ±12.5mV Accuracy to 5.00V (MAX17043)
    • ±30mV Accuracy to 10.00V (MAX17044)
  • Accurate Relative Capacity (RSOC) Calculated from ModelGauge Algorithm
  • No Offset Accumulation on Measurement
  • No Full-to-Empty Battery Relearning Necessary
  • No Sense Resistor Required
  • External Alarm/Interrupt for Low-Battery Warning
  • 2-Wire Interface
  • Low Power Consumption
  • Tiny, Lead-Free, 8-Pin, 2mm x 3mm TDFN Package or Tiny 0.4mm Pitch 9-Bump UCSP Package


  • Digital Still, Video, and Action Cameras
  • Handheld Computers and Terminals
  • Health and Fitness Monitors
  • Smartphones, Tablets
  • Wireless Speakers
Part NumberFunctionsBattery TypeInterfaceParameters MeasuredFuel Gauge AlgorithmApplicationsVSUPPLY
Package/PinsOper. Temp.
MAX17043 Fuel Gauge1 Cell Li-Ion2-Wire
State of Charge
-40 to +85
MAX17044 2 Cell Li-Ion
See All Battery Monitors, Protectors, and Selectors (45)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

CAD Symbols and Footprints

  • MAX17043G+T
  • MAX17043G+T10W
  • MAX17043G+U
  • MAX17043G-E+T
  • MAX17043G-E+U
  • MAX17043X+
  • MAX17043X+T10
  • MAX17043X+U
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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