MAX17055

Part: MAX17055 — Maxim Integrated Type: Fuel Gauge IC Description: Low 7μA operating current fuel gauge that implements Maxim ModelGauge™ m5 EZ algorithm for accurate state-of-charge and remaining capacity reporting without battery characterization.

Operating Conditions:

• Supply voltage: 2.3–4.9 V
• Operating temperature: -40 to +85 °C
• I2C clock frequency: 0–400 kHz

Absolute Maximum Ratings:

• Max BATT to CSP voltage: +6V
• Max ALRT to CSP voltage: +17V
• Max SDA, SCL to CSP voltage: +6V

Key Specs:

• Hibernate supply current: 7 μA (typ, T A ≤ +50°C)
• Active supply current: 18 μA (typ, T A ≤ +50°C)
• BATT measurement error: ±7.5 mV (T A = +25°C)
• BATT measurement range: 2.3–4.9 V
• Current measurement offset error: ±1.5 μV (typ)
• Current measurement range: ±51.2 mV
• Internal temperature measurement error: ±1 °C (typ)
• Sense resistor range: 1mΩ to 1000mΩ

Features:

• ModelGauge m5 EZ algorithm, no characterization required
• Robust against battery variation, eliminates error near empty voltage
• Eliminates coulomb counter drift, current, temperature, and age compensated
• Supports Li+ and variants including LiFePO4
• Precision measurements of current, voltage, and temperature
• Alert indicator for voltage, SOC, temperature, current, and 1% SOC change
• Time-to-Empty and Time-to-Full Estimation

Applications:

• Wearables, Smartwatches
• Smartphones, Tablets, 2-in-1 Laptops
• 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
• Portable Game Players, Toys

Package:

• WLP (9-pin, 1.4mm x 1.5mm, 0.4mm pitch)
• TDFN (10-pin, 2mm x 2.5mm)

• ModelGauge m5 EZ
• No Characterization Required for EZ Performance
• Robust Against Battery Variation
• Eliminates Error Near Empty Voltage
• Eliminates Coulomb Counter Drift
• Current, Temperature, and Age Compensated
• Does Not Require Empty, Full, or Idle States
• Low 7μA Operating Current
• Wide Sense Resistor Range
• 1mΩ to 1000mΩ
• PCB Metal Sensing + Temperature Compensation
• Supports Li+ and Variants Including LiFePO 4
• ±1°C Internal Temperature or Thermistor
• Dynamic Power Estimates Power Capability During Discharge
• Time-to-Empty and Time-to-Full Estimation · Constant Power or Constant Current
• Predicts Remaining Capacity Under Theoretical Load
• Precision Measurement System
• No Calibration Required
• Alert Indicator for Voltage, SOC, Temperature, Current and 1% SOC Change

• Wearables, Smartwatches
• Smartphones
• Tablets, 2-in-1 Laptops
• 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
• Portable Game Players
• Toys

Ordering Information appears at end of data sheet.

(V BATT = 2.3V to 4.9V, T A = -40°C to 85°C, typical values are T A = +25°C, Limits are 100% tested at T A = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Specifications marked GBD are guaranteed by design and not production tested.)

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.

Figure 1 shows two application circuits. One where the MAX17055 is located in a system that has a removable battery pack and the other where the MAX17055 is located in a system with a captive battery. In both cases, the IC is mounted outside of the protector circuit to allow communication to the pack even when the protection FETs are disabled. Take care to avoid exceeding the maximum operating voltage on any pin under fault conditions. In the removable battery system, temperature readings are made using an external thermistor divider network. In the captive pack system, temperature measurements are made internal to the IC saving the cost and size of two components. System current is measured using an external sense resistor connected between the CSP and CSN pins. System voltage measurements are made between the BATT and CSP pins. Keep the BATT and REG bypass capacitor loop areas as small as possible by connecting them directly to CSP. Note that when using the TDFN package option connect the exposed pad (EP) directly to CSP.

Figure 1. Typical Application Schematics

Figure 1 shows two application circuits. One where the MAX17055 is located in a system that has a removable battery pack and the other where the MAX17055 is located in a system with a captive battery. In both cases, the IC is mounted outside of the protector circuit to allow communication to the pack even when the protection FETs are disabled. Take care to avoid exceeding the maximum operating voltage on any pin under fault conditions. In the removable battery system, temperature readings are made using an external thermistor divider network. In the captive pack system, temperature measurements are made internal to the IC saving the cost and size of two components. System current is measured using an external sense resistor connected between the CSP and CSN pins. System voltage measurements are made between the BATT and CSP pins. Keep the BATT and REG bypass capacitor loop areas as small as possible by connecting them directly to CSP. Note that when using the TDFN package option connect the exposed pad (EP) directly to CSP.