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BQ77PL900DLRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ77PL900DLRG4 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 60 page  1 FEATURES 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, or 10 Series-Cell Primary Protection The bq77PL900 is a five to ten series cell lithium-ion battery pack protector. The integrated I2C • PMOS FET Drive for Charge and Discharge communications interface allows the bq77PL900 also FETs to be as an analog front end (AFE) for a Host • Capable of 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 used to power • Supply Voltage Range from 7 V to 50 V a host controller or support circuitry. • Low Supply Current of 450 µA Typical The bq77PL900 integrates a 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 with a host – Programmable Threshold and Delay Time microcontroller to 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 – Overcurrent in Discharge overvoltage, undervoltage, overcurrent in discharge, and short circuit in discharge conditions. When the – Short Circuit in Discharge EEPROM 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 Interface to Host Controller to configure the protection features. – Analog Interface for Host Cell Measurement The analog front end (AFE) outputs allow a host and System Charge/Discharge Current controller to observe individual cell voltages and charge/discharge currents. The host controller’s – Host-Controlled Protection Recovery analog-to-digital converter connects to the – Host-Controlled Cell Balancing bq77PL900 to acquire these values. Cell balancing can be performed autonomously, or the host controller can activate it individually via a cell • Cordless Power Tools bypass path integrated into the bq77PL900. Internal • Power Assisted Bicycle/Scooter control registers accessible via the I2C interface • Uninterruptible Power Supply (UPS) Systems configure this operation. The maximum balancing • Medical Equipment bypass current is set via an external series resistor and the internal FET-on resistance (typically 400 Ω). • Portable Test Equipment Optionally, external bypass cell balance FETs can be used for increased current capability. 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 © 2008–2009, 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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