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BQ77PL900DLR-BQ77PL900DLRG4
5-10 cell Li-ion Battery protection & AFE
1FEATURES
DESCRIPTION
APPLICATIONS
bq77PL900
www.ti.com...................................................................................................................................................... SLUS844B–JUNE 2008–REVISED JANUARY 2009
Five to Ten Series Cell Lithium-Ion or Lithium-Polymer Battery Protector
and Analog Front End 5,6,7,8,9,or10 Series-Cell Primary
Protection The bq77PL900isa fiveto ten series cell lithium-ion
battery pack protector. The integrated I2C•
PMOS FET Drive for Charge and Dischargecommunications interface allows the bq77PL900 also
FETs to be as an analog front end (AFE) fora Host•
Capableof Operation with 1-mΩ Sense controller. Two LDOs, one 5-V, 25-mA and one 3.3-V,
Resistor 25-mA, are also included and may be usedto power•
Supply Voltage Range from7Vto 50V a host controlleror support circuitry.
Low Supply Currentof 450 μA
Typical The bq77PL900 integratesa voltage translation•
Integrated 5-V, 25-mA LDO system to extract battery parameters such as
individual cell voltages and charge/discharge current.•
Integrated 3.3-V, 25-mA LDO Variables such as voltage protection thresholds and•
Stand-Alone Mode detection delay times can be programmed by using
– Pack Protection Control and Recovery the internal EEPROM.
Individual Cell Monitoring The bq77PL900 can act as a stand-alone
Integrated Cell Balancing self-contained battery protection system (stand-alone
mode).It can alternatively be combined witha host
– Programmable Threshold and Delay Time microcontrollerto offer fuel gauge or other battery
for management capabilities to the host system
– Overvoltage (host-control mode).
Undervoltage The bq77PL900 provides full safety protection for
– Overcurrentin Discharge overvoltage, undervoltage, overcurrentin discharge,
and short circuitin discharge conditions. When the
– Short Circuitin DischargeEEPROM programmable safety thresholds are
– Fixed Overtemperature Protection reached, the bq77PL900 turns off the FET drive•
Host Control Mode autonomously. No external components are needed
I2C Interfaceto Host Controller to configure the protection features.
Analog Interface for Host Cell Measurement The analog front end (AFE) outputs allowa host
and System Charge/Discharge Current controller to observe individual cell voltages and
charge/discharge currents. The host controller’s
– Host-Controlled Protection Recoveryanalog-to-digital converter connects to the
– Host-Controlled Cell Balancing bq77PL900to acquire these values.
Cell balancing can be performed autonomously,or
the host controller can activateit individually viaa cell•
Cordless Power Tools bypass path integrated into the bq77PL900. Internal•
Power Assisted Bicycle/Scooter control registers accessible via theI2C interface•
Uninterruptible Power Supply (UPS) Systems configure this operation. The maximum balancing•
Medical Equipment bypass currentis set via an external series resistor
and the internal FET-on resistance (typically 400 Ω).•
Portable Test Equipment Optionally, external bypass cell balance FETs canbe
used for increased current capability.
