Fuel Gauge 9-Pin WLP T/R

The MAX17047/MAX17050 incorporate the Maxim ModelGauge m3 algorithm that combines the excellent short-term accuracy and linearity of a coulomb counter with the excellent long-term stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel-gauge accuracy. ModelGauge m3 cancels offset accumulation error in the coulomb counter, while providing better short-term accuracy than any purely voltage-based fuel gauge. Additionally, the ModelGauge m3 algorithm does not suffer from abrupt corrections that normally occur in coulomb-counter algorithms, since tiny continual corrections are distributed over time. The device automatically compensates for aging, temperature, and discharge rate and provides accurate state of charge (SOC) in mAh or %, as well as time-to-empty over a wide range of operating conditions. The device provides two methods for reporting the age of the battery: reduction in capacity and cycle odometer. The device provides precision measurements of current, voltage, and temperature. Temperature of the battery pack is measured using an external thermistor supported by ratiometric measurements on an auxiliary input. A 2-wire (I2C) interface provides access to data and control registers. The MAX17047 is available in a lead(Pb)-free, 3mm x 3mm, 10-pin TDFN package. The MAX17050 is available in a 0.4mm pitch 9-bump WLP package.

• Accurate Battery-Capacity and Time-To-Empty Estimation
  • Temperature, Age, and Rate Compensated
  • Does Not Require Empty, Full, or Idle States to Maintain Accuracy

Precision Measurement System

• No Calibration Required

ModelGauge m3 Algorithm

• Long-Term Influence by Voltage Fuel Gauge Cancels Coulomb-Counter Drift
• Short-Term Influence by Coulomb Counter Provides Excellent Linearity
• Adapts to Cell Characteristics

External Temperature-Measurement Network

• Actively Switched Thermistor Resistive Divider Reduces Current Consumption

Low Quiescent Current

• 25µA Active, < 0.5µA Shutdown

Alert Indicator for SOC, Voltage, Temperature, and Battery Removal/Insertion Events

AtRate Estimation of Remaining Capacity

2-Wire (I²C) Interface

Tiny, Lead(Pb)-Free, 3mm x 3mm, 10-Pin TDFN Package or Tiny 0.4mm Pitch 9-Bump WLP Package