PDF《19-6496; Rev 0; 10/12》

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Rev 0;

10/12 备有评估板定购信息在数据资料的最后给出. 相关型号以及配合该器件使用的推荐产品,请参见:china.maximintegrated. com/MAX14920.related. 功能框图在数据资料的最后给出. 概述 MAX14920/MAX14921电池测量模拟前端(AFE)器件用于 高精度采样电池电压,并提供电平转换,可支持多达16节/? +65V?(最大)的主/辅电池组.MAX14920监测多达12节电 池,MAX14921监测多达16节电池.两款器件均同时采样 所有电池电压,允许高精度确定充电状态和源阻抗.将所 有电池电压以单位增益转换成以地为基准的电压信号,简 化外部ADC的数据转换. 器件具有低噪声、低失调放大器,可缓冲高达+5V的差分 电压,允许监测所有常见锂离子(Li+)电池,电池电压误差 为±0.5mV. 器件的高精度特性使其理想用于监测放电特性曲线非常平 坦的电池,例如锂-金属磷酸盐电池. 通过外部FET驱动器支持无源电池平衡.器件内部集成的 诊断功能允许实现开路检测和欠压/过压报警,器件可通过 菊链SPI接口控制. MAX14920采用64引脚(10mm?x?10mm)?TQFP封装,带裸 焊盘;

MAX14921采用80引脚(12mm?x?12mm)?TQFP封装.两款器件均工作在-40°C至+85°C扩展级温度范围. 应用 工业备用电池系统 电信备用电池系统 储能电池组 电子运输储能电池组 特性 S 高精度 ? ±0.5mV (最大)电池电压 ? 同时采样电池电压 ? 自校准 S 集成诊断功能 ? 开路和短路故障检测 ? 欠压/过压报警 ? 热关断 S 高灵活性 ? SPI接口 ? 提供12节和16节电池配置版本 ? +6V最小(3节电池)工作电压 ? +0.5V至+4.5V电池电压测量范围 ? 集成电池平衡FET驱动器 ? 集成5V LDO S 低功耗 ? 1μA关断模式 ? 1μA/10μA电池耗流 ??2 (All voltages referenced to AGND.) VP to AGND 0.3V to +70V LDOIN to AGND VA - 0.3V) to (VP + 0.3V) VA to AGND 0.3V to +6V CV0, DGND to AGND.0.3V to +0.3V SCLK, SDI, CS, EN.0.3V to +6V SDO, SAMPL.0.3V to (VL + 0.3V) CV1 to AGND.0.3V to +6V CV2CCV12 to AGND.VCV(n* - 1) - 0.3V) to (VP + 0.3V) CT1CCT12 to AGND.0.3V to (VCV1CVCV12 + 0.3V) CB2CCB12 to AGND.0.3V to (VCV(n* - 1) + 0.3V) CV2CCV16 to AGND (MAX14921 only)VCV(m** - 1) - 0.3V) to (VP + 0.3V) CT1CCT16 to AGND (MAX14921 only)0.3V to (VCV1CVCV16 + 0.3V) CB2CCB16 to AGND (MAX14921 only)0.3V to (VCV(m** - 1) + 0.3V) BA1 to AGND.0.3V to (VCV1 + 0.3V) BA2CBA12 to AGND.VCV(n* - 1) - 0.3V) to min((VCVn* + 0.3V) or +6V) BA2CBA16 to AGND (MAX14921 only)VCV(m** - 1) - 0.3V) to min .((VCVm** + 0.3V) or +6V) AOUT, T1, T2, T3 to AGND.0.3V to (VA + 0.3V) Continuous Power Dissipation (TA = +70°C) 64-Pin TQFP-EP (derate 31.3mW/°C above +70°C)...2508mW 80-Pin TQFP (derate 23.3mW/°C above +70°C)1860mW Operating Temperature Range.40NC to +85°C Maximum Junction Temperature.150°C Storage Temperature Range.65NC to +150°C Lead Temperature (soldering, 10s)300°C Soldering Temperature (reflow)260°C *n = 2C12 **m = 2C16 ABSOLUTE MAXIMUM RATINGS Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VP = +65V, DGND = AGND, VL = VEN = +3.3V, VA = +5V, CSAMPLE = 1FF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) Junction-to-Ambient Thermal Resistance (qJA) 64-Pin TQFP-EP.31.9°C/W 80-Pin TQFP.43°C/W Junction-to-Case Thermal Resistance (qJC) 64-Pin TQFP-EP.1°C/W 80-Pin TQFP.8°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to china.maximintegrated.com/thermal-tutorial. PACKAGE THERMAL CHARACTERISTICS (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES VP Supply Voltage VP +6 +65 V VP Supply Current IP_OFF EN = low or LOPW =