BQ20Z45 Datasheet, PDF (1/20 Pages) Texas Instruments – SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™

bq20z45
www.ti.com .................................................................................................................................................................................................. SLUS800 – MARCH 2009
SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™
FEATURES
1
•2 Next Generation Patented Impedance Track™
Technology Accurately Measures Available
Charge in Li-Ion and Li-Polymer Batteries
– Better Than 1% Error Over the Lifetime of
the Battery
• Supports the Smart Battery Specification
SBS V1.1
• Flexible Configuration for 2 to 4 Series Li-Ion
and Li-Polymer Cells
• Powerful 8-Bit RISC CPU With Ultralow Power
Modes
• Full Array of Programmable Protection
Features
– Voltage, Current, and Temperature
• Satisfies JEITA Guidelines
• Added Flexibility to Handle More Complex
Charging Profiles
• Lifetime Data Logging
• Supports SHA-1 Authentication
• Complete Battery Protection and Gas Gauge
Solution in One Package
• Available in a 38-Pin TSSOP (DBT) package
DESCRIPTION
The bq20z45 SBS-compliant gas gauge and
protection IC is a single IC solution designed for
battery-pack or in-system installation. The bq20z45
measures and maintains an accurate record of
available charge in Li-ion or Li-polymer batteries
using its integrated high-performance analog
peripherals, monitors capacity change, battery
impedance, open-circuit voltage, and other critical
parameters of the battery pack as well and reports
the information to the system host controller over a
serial-communication bus. Together with the
integrated analog front-end (AFE) short-circuit and
overload protection, the bq20z45 maximizes
functionality and safety while minimizing external
component count, cost, and size in smart battery
circuits.
The implemented Impedance Track™ gas gauging
technology continuously analyzes the battery
impedance, resulting in superior gas-gauging
accuracy. This enables remaining capacity to be
calculated with discharge rate, temperature, and cell
aging all accounted for during each stage of every
cycle with high accuracy.
APPLICATIONS
• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation
AVAILABLE OPTIONS
T_A
–40°C to 85°C
38-PIN TSSOP (DBT) Tube
bq20z45DBT ⁽²⁾
PACKAGE ⁽¹⁾
38-PIN TSSOP (DBT) Tape and Reel
bq20z45DBTR ⁽³⁾
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) A single tube quantity is 50 units.
(3) A single reel quantity is 2000 units
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Impedance Track is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated