• Battery Fuel Gauge and Charger Controller for 1- Cell Li-Ion Applications

• Resides on System Main Board

• Battery Fuel Gauge Based on Patented Impedance Track? Technology

• Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions

• Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature/Rate Inefficiencies

• Low-Value Sense Resistor (5 mΩ to 20 mΩ)

• Battery Charger Controller With Customizable Charge Profiles

• Configurable Charge Voltage and Current Based on Temperature

• Optional State of Health (SoH) and Multilevel- Based Charge Profiles

• Host-Free Autonomous Battery Management System

• Reduced Software Overhead Allows for Easy Portability Across Platforms and Shorter OEM Design Cycles

• Higher Safety and Security

• Intelligent Chargingx97Customized and Adaptive Charging Profiles

• Charger Control Based on SoH

• Temperature Level Charging (TLC)

• Battery Charger Controller for bq2419x Single-Cell Switched-Mode Battery Charger

• Stand-Alone Charging Solution

• SHIP Mode Capability

• 400-kHz I2C Interface for Connection to System Microcontroller Port

• In a 15-Pin NanoFree? Packaging

The Texas Instruments bq27531-G1 system-side Li- Ion Battery Management Unit is a microcontroller peripheral that provides Impedance Track fuel gauging and charging control for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development. Together with the bq2419x Single-Cell Switched-Mode Charger, the bq27531-G1 manages an embedded battery (nonremovable) or a removable battery pack.

The bq27531-G1 uses the patented Impedance Track algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-ofcharge (%), run time to empty (minimum), battery voltage (mV), temperature (°C), and state of health (%).

Battery fuel gauging with the bq27531-G1 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery circuit. The CSP option is a 15-pin package in the dimensions of 2.61 mm × 1.96 mm with a 0.5-mm lead pitch, which is ideal for spaceconstrained applications.