bq29311

www.ti.com bq29311 SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003 THREEĆ AND FOURĆCELL LITHIUMĆION OR LITHIUMĆPOLYMER BATTERY PROTECTION IC FEATURES D 3- or 4-Cell Series Protection Control D Autonomous Overcurrent and Short Circuit Protection D Provides Individual Cell Voltages to Battery Management Host D Integrated Cell Balancing Control D I2C Compatible User Interface Allows Access to Battery Information D User Control to Initiate Protection D Integrated 3.3-V 25-mA LDO D Programmable Shutdown and Brownout Control D Provides Drive for Three External FETs D Low Supply Current of 140 µA Typical D Programmable Threshold and Delay for Short-Circuit Current Protection D Provides Drive for Three External FETs D Can Directly Interface With bq2083/5 for Complete Battery Management Solution APPLICATIONS D Notebook Computer Battery Packs D Test Equipment PIN ASSIGNMENTS PW PACKAGE (TOP VIEW) VCC 1 VBAT 2 VC1 3 VC2 4 VC3 5 VC4 6 VC5 7 SR1 8 SR2 9 CNTL 10 GND 11 VCELL 12 24 VPACK 23 DSG 22 PCHG 21 CHG 20 LEDOUT 19 VREG 18 TOUT 17 XALERT 16 CLKIN 15 SDATA 14 SCLK 13 GND DESCRIPTION The bq29311 is a three- or four-cell lithium-ion battery pack protection analog front end (AFE) IC that incorporates a 3.3-V 25-mA low-dropout regulator (LDO) and an I2C compatible interface to extract battery parameters such as cell voltages and control output status. Other parameters, such as overcurrent protection threshold and delay, can also be prog...