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1 Features

1? Battery Fuel Gauge and Charger Controller for 1-

Cell Li-Ion Applications up to 14,500-mAh

Capacity

? Resides on System Main Board

? Battery Fuel Gauge Based on Patented

Impedance Track? Technology

– Models the Battery Discharge Curve for

Accurate Remaining Capacity Predictions

– Automatically Adjusts for Battery Aging,

Battery Self-Discharge, and Temperature and

Rate Inefficiencies

– Low-value Sense Resistor (5 to 20 mΩ)

? Battery Charger Controller With Customizable

Charge Profiles

– Configurable Charge Voltage and Current

Based on Temperature

– Optional State-of-Health (SoH) and Multi-Level

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

? Runtime Improvements

– Longer Battery Runtime Leveraging

Impedance Track? Technology

– Tighter Accuracy Controls for Charger

Termination

– Improved Recharge Thresholds

? Intelligent Charging – Customized and Adaptive

Charging Profiles

– Charger Control Based on SoH

– Temperature Level Charging (TLC)

? Stand-alone Battery Charger Controller for

bq2425x Single-Cell Switch-mode Battery Charger

? 400-kHz I2C? Interface for Connection to System

Microcontroller Port

1

2 Applications

? Smartphones, Feature Phones, and Tablets

? Digital Still and Video Cameras

? Handheld Terminals

? MP3 or Multimedia Players

3 Description

The bq27532-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 fuel gauge requires little system microcontroller

firmware development. Together with bq2425x singlecell

switch-mode charger, the fuel gauge manages an

embedded battery (non-removable) or a removable

battery pack.

The fuel gauge uses the patented Impedance Track

algorithm for fuel gauging, and provides information,

such as remaining battery capacity (mAh), state-ofcharge

(%), runtime-to-empty (minimum), battery

voltage (mV), temperature (°C), and SoH (%).

Battery fuel gauging with the device requires only

PACK+ (P+), PACK– (P–), and thermistor (T)

connections to a removable battery pack or

embedded battery circuit. The 15-pin NanoFree?

(CSP) package has dimensions of 2.61 mm × 1.96

mm with 0.5-mm lead pitch. It is ideal for spaceconstrained

applications.