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BQ77910 Datasheet(PDF) 1 Page - Texas Instruments

Part # BQ77910
Description  Stand-Alone Multi-Cell Lithium-Ion/Polymer Precision Protectors
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ77910 Datasheet(HTML) 1 Page - Texas Instruments

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bq77910
www.ti.com
SLUSA07B
– AUGUST 2010 – REVISED MAY 2011
Stand-Alone Multi-Cell Lithium-Ion/Polymer Precision Protectors
Check for Samples: bq77910
Automatic cell balancing is provided using internal
1
FEATURES
50-mA cell circuits. A robust balancing algorithm
4-, 5-, 6-, 7-, 8-, 9-, or 10 Series Cell Protection
ensures optimum performance by maintaining all cell
Individual Cell-Voltage Monitoring
voltages in balance. Balancing may be configured to
Low-Side NMOS FET Drive for Charge and
operate at all times, only during charge, or can be
Discharge Control
disabled completely.
Compatible With 1-m
Ω Current-Sense Resistor
Additional advanced safety features of the bq77910
Supply-Voltage Range From 5.6 V to 50 V
include
the
ability
to
control
split
power-path
MOSFETs,
an
open-cell
sense-line
detection
Integrated 3.3-V Micro-Power LDO Regulator
mechanism, and the ability to detect an open or
Low Supply Current
shorted external temperature sensor.
– Normal Mode: 50 µA, Typical
Programmable Protection Functions
– Shutdown Mode, LDO OFF: 3 µA, Typical
Wide range of programmable detection thresholds
38-Pin TSSOP Package
and delay times
Internal 50-mA Automatic Cell Balancing
Configurable for multiple cell types and application
requirements:
APPLICATIONS
– Cell overvoltage
Cordless Power Tools
– Cell undervoltage
Cordless Lawn Equipment
– Pack discharge overcurrent
Electric Bikes
– Pack discharge short circuit
UPS
– Pack charge short-circuit current
Medical Equipment
Variable gain (
×1 or ×5) current-sense circuit
Light Electric Vehicles (LEV)
– Compatible with a wide range of current-sense
resistors (1 m
Ω to 5 mΩ typical) sized for
DESCRIPTION
application requirements
The bq77910 precision protector is a complete
Fixed Hardware Protection Functions
stand-alone,
self-contained
battery-protection
and
cell-balancing device intended for Li-ion/polymer
Preset overtemperature protections
battery packs.
Open-cell detection
The bq77910 monitors 4 to 10 series individual cell
Open and shorted thermistor detection
voltages and provides fast-acting outputs which may
Brownout protection quickly shuts off FETs under
be used to drive N-channel MOSFETs to interrupt the
low battery conditions to avoid FET overheating
power path. Activation delays and recovery methods
for each safety condition are fully programmable in
non-volatile memory.
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.
PRODUCTION DATA information is current as of publication date.
Copyright
© 2010–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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