1 Features

1• 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 Charging—Customized 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

2 Applications

• Smart Phones, Feature Phones, and Tablets

• Digital Still and Video Cameras

• Handheld Terminals

• MP3 or Multimedia Players

3 Description

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.