BQ6400 Datasheet, PDF (1/17 Pages) Texas Instruments – Single Chip 3 or 4 Cell Li-Ion Battery Management Controller With PowerPump™ Cell Balancing Technology

bq6400
www.ti.com ......................................................................................................................................................................................... SLUS841 – SEPTEMBER 2008
Single Chip 3 or 4 Cell Li-Ion Battery Management Controller With PowerPump™ Cell
Balancing Technology
FEATURES
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•23 Advanced SmartSafety™
– Prevention – Optimal Cell Management
– Diagnosis – Improved Sensing of Cell
Problems
– Fail Safe – Detection of Event Precursors
• Rate-of-Change Detection of all Important Cell
Characteristics:
– Voltage – Impedance – Cell Temperature
• PowerPump™ Active Cell Balancing Results in
Longer Run Time and Cell Life
• High Resolution 18-Bit Integrating Delta-Sigma
Coulomb Counter for Precise Charge-Flow
Measurements and Gas Gauging
• Multiple Independent Δ-Σ A/Ds: One-per-cell
Voltage, Plus Separate Temperature, Current
and Safety
• Simultaneous, Synchronous Measurement of
Pack Current and Individual Cell Voltages
• Very Low Power Consumption: < 250 µA
Active, < 150 µA Standby, < 40 µA Ship, and <
1 A Under-Voltage Shutdown
• Accurate, Advanced Temperature Monitoring
of Cells and MOSFETs With up to 13 Sensors
• Fully Programmable Voltage, Current, Balance
and Temperature Protection Features
• Cell Balancing Transfers Charge Efficiently
From Cell to Cell During all Operating
Conditions
• Fail-Safe Operation of Pack Protection Circuits
and MOSFETs
• Designed for 3 to 4 Series Cell Battery Packs
• Smart Battery System 1.1 Compliant
• Integrated Support for Intel™ AMPS
• Field Upgradeable Flash Memory
APPLICATIONS
• Notebook Computer Battery Packs
• Portable Medical Equipment
• Portable Test Equipment
DESCRIPTION
The bq6400 Battery Management Controller is a
complete Li-Ion control, monitoring, and safety
solution designed for notebook computers and
portable equipment. It is designed specifically to
provide an enhanced, optimized solution for packs
using three or four series cells.
The bq6400 provides accurate gas gauging while
providing control, communications and safety
functions for the system. It provides simultaneous,
synchronized voltage and temperature measurements
using one A/D per-cell technology. Voltage
measurements are also simultaneous with pack
current measurements, eliminating system induced
noise from measurements. This allows the precise,
continuous, real-time calculation of cell impedance
under all operating conditions, even during widely
fluctuating loads.
PowerPump™ technology transfers charge between
cells to balance their voltage and capacity. Balancing
is programmable during all battery modes: Charge,
discharge, and rest. Highly efficient charge transfer
circuitry nearly eliminates energy loss while providing
true real-time balance between cells, resulting in
longer run-time and improved cell cycle life.
Temperature is sensed by one internal and up to 12
external sensors. This permits accurate temperature
monitoring of each cell individually as well as pack
protection MOSFETs. Internal firmware is then able to
compensate for the temperature induced effects on
cell capacity, impedance, and OCV on a cell-by-cell
basis, resulting in superior charge/discharge and
balancing control.
Support for Intel™ Adaptive Mobile Power System
(AMPS) requirements for battery and MOSFET
control is built-in. User definable inputs require no
external hardware translation logic.
The bq6400 is completely user-configurable with
parametric tables in flash memory to suit a variety of
cell chemistries, operating conditions, safety control,
and data reporting needs. It is easily configured using
the supplied Battery Wizard™ graphical user
interface. The device is fully programmed and
requires no algorithm or firmware development.
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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.
PowerPump, SmartSafety are trademarks of Texas Instruments.
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Intel is a trademark of Intel Corporation.
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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 © 2008, Texas Instruments Incorporated