BQ78PL114_09 Datasheet, PDF (1/31 Pages) Texas Instruments – PowerLAN™ Master Gateway Battery Management Controller With PowerPump™ Cell Balancing Technology

bq78PL114
www.ti.com................................................................................................................................................ SLUS850B – SEPTEMBER 2008 – REVISED APRIL 2009
PowerLAN™ Master Gateway Battery Management Controller
With PowerPump™ Cell Balancing Technology
FEATURES
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•23 bq78PL114 Designed for Managing 3- to
8-Series-Cell Battery Systems
• bq78PL114S12 Firmware Upgrade Supports 3-
to 12-Series-Cell Battery Systems
– Adds Support for LCD and Electronic Paper
Displays or EPDs
– Configurable for 11-A, 26-A, or 110-A
Operating Currents
• Systems With More Than Four Series Cells
Require External bq76PL102 Dual-Cell
Monitors
• SmartSafety Features:
– 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 Technology Transfers Charge
Efficiently From Cell to Cell During All
Operating Conditions, Resulting in Longer
Run Time and Cell Life
– bq78PL114S12 Adds User-Configurable
PowerPump Cell-Balancing Modes
• High-Resolution 18-Bit Integrating Delta-Sigma
Coulomb Counter for Precise Charge-Flow
Measurements and Gas Gauging
• Multiple Independent Δ-Σ ADCs: One-per-Cell
Voltage, Plus Separate Temperature, Current,
and Safety
• Simultaneous, Synchronous Measurement of
Pack Current and Individual Cell Voltages
• Very Low Power Consumption
– bq78PL114: < 250 µA Active, < 150 µA
Standby, < 40 µA Ship, and < 1 µA
Undervoltage Shutdown
– bq78PL114S12: < 300 µA Active, < 185 µA
Standby, < 85 µA Ship, and < 1 µA
Undervoltage Shutdown
• Accurate, Advanced Temperature Monitoring
of Cells and MOSFETs With up to 12 Sensors
• Fail-Safe Operation of Pack Protection
Circuits: Up to Three Power MOSFETs and
One Secondary Safety Output (Fuse)
• Fully Programmable Voltage, Current, Balance,
and Temperature-Protection Features
• External Inputs for Auxiliary MOSFET Control
• Smart Battery System 1.1 Compliant via
SMBus
APPLICATIONS
• Portable Medical Instruments and Test
Equipment
• Mobility Devices (E-Bike)
• Uninterruptible Power Supplies and Hand-Held
Tools
DESCRIPTION
The bq78PL114 master gateway battery controller is
part of a complete Li-Ion control, monitoring, and
safety solution designed for large series cell strings.
The bq78PL114 and bq78PL114S12 along with
bq76PL102 PowerLAN™ dual-cell monitors provide
complete battery-system control, communications,
and safety functions for a structure of three up to
twelve series cells. This PowerLAN system provides
simultaneous, synchronized voltage and current
measurements using one A/D per-cell technology.
This eliminates system-induced noise from
measurements and allows the precise, continuous,
real-time calculation of cell impedance under all
operating conditions, even during widely fluctuating
load conditions.
PowerPump technology transfers charge between
cells to balance their voltage and capacity. Balancing
is possible 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 cycle life.
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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.
PowerLAN, PowerPump, bqWizard are trademarks of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2008–2009, Texas Instruments Incorporated