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BQ77910 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ77910 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 56 page 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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