BQ76PL102 Datasheet, PDF (1/18 Pages) Texas Instruments – PowerLAN Dual-Cell Li-Ion Battery Monitor With PowerPump Cell Balancing

bq76PL102
www.ti.com .......................................................................................................................................... SLUS887A – DECEMBER 2008 – REVISED OCTOBER 2009
PowerLAN™ Dual-Cell Li-Ion Battery Monitor With PowerPump™ Cell Balancing
FEATURES
1
•2 Monitors up to Two Individual Cell Voltages
and Temperatures
• Part of a Complete Low-Cost Solution for
Battery Packs of up to 12 Series and One or
More Parallel Cells (When Used With
bq78PL114).
• Advanced PowerPump™ Balancing
Technology Equalizes Cells in Li-Ion Battery
Packs, Resulting in Longer Run Time and Cell
Life.
• PowerPump™ Cell Balancing Transfers
Charge From Cell to Cell During all Operating
Conditions – No Wasteful Current Bleeding or
Associated Heat Buildup.
• Unique PowerLAN™ Isolated Communications
Technology Permits Simultaneous
Measurement of All Individual Cell Voltages in
a Series String.
• Low Current Consumption:
– <250 µA Active
– <35 µA Standby
– <1 µA Undervoltage Shutdown
• Connects Directly to Cells, No Resistive
Dividers
• Internal LDO Regulator for Support Circuitry
• Ultrasmall Footprint, 3-mm × 3-mm
• Millivolt Measurement Resolution Using
Delta-Sigma A/D Converter
• Self-Calibrating Time Base – No Crystal
Required When Used With bq78PL114
APPLICATIONS
• Uninterruptible Power Supplies (UPS)
• Portable Medical and Test Equipment
• Electric Bikes and Mild-EV Battery Packs
• Multicell Series Strings ≥ 5S
RELATED DEVICES
• bq78PL114 Master Gateway Battery Controller
DESCRIPTION
The bq76PL102 PowerLAN dual-cell battery monitor
is part of a complete scalable battery management
system for use with arrays of up to 12 Li-Ion
rechargeable cells. The bq76PL102 connects to one
or two cells in a series string, performs voltage and
temperature monitoring of each individual cell, and
reports these parameters over the PowerLAN
communication network. Together with a bq78PL114
master-gateway battery controller, the bq76PL102
forms a complete battery monitoring and
management system for higher cell-count
applications.
Partitioning of the battery monitor function on a per
cell basis permits connection and measurement close
to the cell. This results in superior accuracy and
management over competing solutions. This scheme
also facilitates the PowerPump cell balancing system,
a technique which actively balances capacities of
Li-Ion batteries without the excessive heat or
limitations of bleed-balancing techniques.
The bq76PL102 PowerPump cell balancing
technology uses a charge-transfer methodology
which does not bleed off excess energy as heat, but
instead moves energy dynamically from cell to cell as
needed. Balancing is performed during all battery
operational modes – charge, discharge, and rest.
Balancing is automatically coordinated between all
cells on a PowerLAN system. PowerPump balancing
technology results in longer run time and longer cell
life.
The PowerLAN communications architecture has
been engineered to provide robust communications in
tough EMI/RFI environments while avoiding the
excessive power draw, high parts count, and elevated
cost of other solutions. PowerLAN permits easy
scalability using series connections of bq76PL102
dual-cell battery monitors. High-cell-count battery
systems of up to 12 series cells are easily
constructed without complicated high-voltage cell
measurement restrictions.
The bq76PL102 works with the bq78PL114
master-gateway battery controller.
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.
PowerPump, PowerLAN are trademarks 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 © 2008–2009, Texas Instruments Incorporated