MAX17223ELT+T

MAX17223ELT+T is Maxim Integrated’s lithium‑ion battery fuel gauge IC. It estimates state of charge (SOC) and remaining capacity for a single-cell Li‑ion pack using a coulomb-counting approach plus a ModelGauge algorithm, providing accurate SOC across voltage, temperature, and aging.
Key points:
- Interfaces: I2C (host MCU reads SOC, remaining capacity, voltage, current, temperature, alerts).
- Measurements: battery voltage, discharge/charge current (via sense path), temperature.
- Features: coulomb counter with auto-calibration, ModelGauge SOC estimation, nonvolatile data storage, programmable alert thresholds, low quiescent current.
- Packaging: ELT+T denotes the device’s package and tape-and-reel shipping variant.
- Typical use: portable devices, wearables, and battery packs needing accurate SOC reporting.
How to use (high level): connect to a single Li‑ion cell, connect sense resistor for current, supply V+, GND, I2C lines to the host, set up registers (capacity, thresholds), and read SOC/remaining capacity over I2C. For exact pinout, electrical specs, and programming, consult the MAX17223 datasheet and evaluation kit.

Concise features of MAX17223ELT+T (battery fuel gauge):
- Single-cell Li‑ion/Li‑polymer fuel gauge with impedance-tracking for accurate SOC estimation
- Coulomb counting with programmable capacity and learning/calibration
- Voltage, current, and temperature sensing
- Digital interface: I2C-compatible for host control (registers, alerts/interrupts)
- Programmable alert/status outputs and fault flags
- Low quiescent current with efficient wake/sleep modes
- Quick-start and auto-learning for long-term accuracy
- Wide input range (typical 2.5–4.5 V) suitable for single-cell packs
- Operating temperature range suitable for embedded systems (e.g., -40 °C to +85 °C)
- Compact ELT+T package variant for small-form-factor designs
Note: For exact specifications (voltage ranges, current limits, register map, and timing), please consult the current MAX17223 datasheet.

MAX17223ELT+T uses a 20-pin TQFN (4×4 mm) surface-mount package. The “+T” suffix denotes Tape & Reel packaging.

Pin count: 20 pins (package variant ELT, taped as +T).
Function: High‑efficiency synchronous buck‑boost DC‑DC converter controller with integrated MOSFETs, used for regulating power rails (battery/automotive applications). The ELT suffix indicates the package type and +T indicates Tape & Reel.

- Manufacturer: Maxim Integrated (now a subsidiary of Analog Devices, Inc.).
- Company type: A fabless semiconductor company that designs and sells analog and mixed-signal integrated circuits (outsources fabrication to foundries).

Used for battery-powered devices requiring Li‑ion battery monitoring and power management. Typical applications include portable consumer electronics (phones, tablets, wearables, handheld tools), notebooks/ultrabooks, medical devices with battery packs, industrial/telecom backup power and remote sensors, and energy‑harvesting wireless sensor networks.