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bq27531-G1
SLUSBE7C – MARCH 2013 – REVISED JANUARY 2016
bq27531-G1 Battery Management Unit Impedance Track™ Fuel Gauge With MaxLife™ Technology for Use With the bq2419x Charger Controller
1 Features
•1 Battery Fuel Gauge and Charger Controller for 1Cell 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 MultilevelBased 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 LiIon 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq27531-G1
DSBGA (15)
2.61 mm × 1.96 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
5V USB or AC Adapter
Simplified Schematic
VBUS
SW SYS
SYSTEM LOAD
BQ2419x BAT
PGND I2C
Application Processor
Voltage Sense
I2C Temp
Sense
BQ27531-G1
SOCINT
Current Sense
Single Cell Li-Ion Battery Pack P+ T
PROTECTION IC
P- FETs
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
bq27531-G1
SLUSBE7C – MARCH 2013 – REVISED JANUARY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Device Options....................................................... 3 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4 7.2 ESD Ratings.............................................................. 4 7.3 Recommended Operating Conditions....................... 4 7.4 Thermal Information .................................................. 4 7.5 Electrical Characteristics: Supply Current................. 5 7.6 Digital Input and Output DC Characteristics ............. 5 7.7 Power-On Reset........................................................ 5 7.8 2.5-V LDO Regulator ................................................ 5 7.9 Internal Clock Oscillators .......................................... 5 7.10 ADC (Temperature and Cell Measurement)
Characteristics ........................................................... 6 7.11 Integrating ADC (Coulomb Counter)
Characteristics ........................................................... 6 7.12 Data Flash Memory Characteristics........................ 6 7.13 I2C-Compatible Interface Communication Timing
Characteristics ...................................