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BQ77908 数据表(PDF) 1 Page - Texas Instruments |
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BQ77908 数据表(HTML) 1 Page - Texas Instruments |
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1 / 56 page  bq77908 www.ti.com SLUSAI5D – APRIL 2011 – REVISED NOVEMBER 2011 Stand-Alone Multi-Cell Lithium-Ion/Polymer Precision Protectors Check for Samples: bq77908 1 FEATURES Automatic cell balancing is provided using internal • 4-, 5-, 6-, 7-, or 8 Series Cell Protection 50-mA cell circuits. A robust balancing algorithm • Individual Cell-Voltage Monitoring ensures optimum performance by maintaining all cell • Low-Side NMOS FET Drive for Charge and voltages in balance. Balancing may be configured to Discharge Control operate at all times, only during charge, or can be disabled completely. • Compatible With 1-m Ω Current-Sense Resistor • Supply-Voltage Range From 5.6 V to 40 V Additional advanced safety features of the bq77908 include the ability to control split power-path • Integrated 3.3-V Micro-Power LDO Regulator MOSFETs, an open-cell sense-line detection • Low Supply Current mechanism, and the ability to detect an open or – Normal Mode: 50 µA, Typical shorted external temperature sensor. – Shutdown Mode, LDO OFF: 5 µA, Typical Programmable Protection Functions • 38-Pin TSSOP Package • Wide range of programmable detection thresholds • Internal 50-mA Automatic Cell Balancing and delay times • Configurable for multiple cell types and application APPLICATIONS requirements: – 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 bq77908 precision protector is a complete Fixed Hardware Protection Functions stand-alone, self-contained battery-protection and • Preset overtemperature protections cell-balancing device intended for Li-ion/polymer battery packs. • Open-cell detection • Open and shorted thermistor detection The bq77908 monitors 4 to 8 series individual cell 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 © 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. |
类似零件编号 - BQ77908 |
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类似说明 - BQ77908 |
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