BQ27531-G1_16 Datasheet, PDF (1/34 Pages) Texas Instruments – Battery Management Unit Impedance Track Fuel Gauge

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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 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-of-
charge (%), 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 space-
constrained 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.
Simplified Schematic
5V USB or
AC Adapter
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.