Packaging informationPackage | PinsSSOP (DL) | 48Operating
temperature range (°C)-40 to 100Package qty | Carrier1,000 | LARGE
T&RFeatures for the BQ77PL9005, 6, 7, 8, 9, or 10 Series-Cell
Primary ProtectionPMOS FET Drive for Charge and Discharge
FETsCapable of Operation with 1-m Sense ResistorSupply Voltage
Range from 7 V to 50 VLow Supply Current of 450 µA
TypicalIntegrated 5 V 25-mA LDOIntegrated 3.3 V 25-mA
LDOStand-Alone Mode Pack Protection Control and RecoveryIndividual
Cell MonitoringIntegrated Cell BalancingProgrammable Threshold and
Delay Time for OvervoltageUndervoltage Overcurrent in Discharge
Short Circuit in DischargeFixed Overtemperature ProtectionHost
Control Mode I2C Interface to Host ControllerAnalog Interface for
Host Cell Measurement and System Charge/Discharge
CurrentHost-Controlled Protection RecoveryHost-Controlled Cell
BalancingAPPLICATIONS Cordless Power ToolsPower Assisted
Bicycle/ScooterUninterruptible Power Supply (UPS) SystemsMedical
EquipmentPortable Test Equipment Description for the
BQ77PL900The bq77PL900 is a five to ten series cell lithium-ion
battery pack protector. The integrated I2C communications interface
allows the bq77PL900 also to be as an analog front end (AFE) for a
Host controller. Two LDOs, one 5 V/25 mA and one 3.3 V/25 mA, are
also included and may be used to power a host controller or support
circuitry.The bq77PL900 integrates a voltage translation system to
extract battery parameters such as individual cell voltages and
charge/discharge current. Variables such as voltage protection
thresholds and detection delay times can be programmed by using the
internal EEPROM.The bq77PL900 can act as a stand-alone
self-contained battery protection system (stand-alone mode). It can
alternatively be combined with a host microcontroller to offer fuel
gauge or other battery management capabilities to the host system
(host-control mode).The bq77PL900 provides full safety protection
for overvoltage, undervoltage, overcurrent in discharge, and short
circuit in discharge conditions. When the EEPROM programmable
safety thresholds are reached, the bq77PL900 turns off the FET
drive autonomously. No external components are needed to configure
the protection features.The analog front end (AFE) outputs allow a
host controller to observe individual cell voltages and
charge/discharge currents. The host controller's analog-to-digital
converter connects to the bq77PL900 to acquire these values.Cell
balancing can be performed autonomously, or the host controller can
activate it individually via a cell bypass path integrated into the
bq77PL900. Internal control registers accessible via the I2C
interface configure this operation. The maximum balancing bypass
current is set via an external series resistor and the internal
FET-on resistance (typically 400 ). Optionally, external
bypass cell balance FETs can be used for increased current
capability. /* January 22, 2024 19:08:37
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