LTC6802IG-1#3ZZTRPBF

LTC6802-1 Multicell Battery Stack Monitor FEATURES DESCRIPTION Qualified for Automotive Applications nn Measures Up to 12 Li-Ion Cells in Series (60V Max) nn Stackable Architecture Enables >1000V Systems nn 0.25% Maximum Total Measurement Error nn 13ms to Measure All Cells in a System nn Cell Balancing: nn On-Chip Passive Cell Balancing Switches nn Provision for Off-Chip Passive Balancing nn Two Thermistor Inputs Plus On-Board Temperature Sensor nn 1MHz Daisy-Chainable Serial Interface nn High EMI Immunity nn Delta Sigma Converter with Built-In Noise Filter nn Open Wire Connection Fault Detection nn Low Power Modes nn 44-Lead SSOP Package The LTC®6802-1 is a complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6802-1 can measure up to 12 series connected battery cells with an input common mode voltage up to 60V. In addition, multiple LTC6802-1 devices can be placed in series to monitor the voltage of each cell in a long battery string. The unique level-shifting serial interface allows the serial ports of these devices to be daisy-chained without optocouplers or isolators. nn APPLICATIONS When multiple LTC6802-1 devices are connected in series they can operate simultaneously, permitting all cell voltages in the stack to be measured within 13ms. To minimize power, the LTC6802-1 offers a measure mode, which simply monitors each cell for overvoltage and undervoltage conditions. A standby mode is also provided. Each cell input has an associated MOSFET switch for discharging overcharged cells. Electric and Hybrid Electric Vehicles nn High Power Portable Equipment nn Backup Battery Systems nn High Voltage Data Acquisition Systems nn For large battery stack applications requiring individually addressable serial communications, see the LTC6802-2. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION NEXT 12-CELL PACK ABOVE Measurement Error Over Extended Temperature LTC6802-1 SERIAL DATA TO LTC6802-1 ABOVE DIE TEMP + V 0.30 0.25 12-CELL BATTERY STRING MEASUREMENT ERROR (%) REGISTERS AND CONTROL MUX 12-BIT ∆∑ ADC V– NEXT 12-CELL PACK BELOW EXTERNAL TEMP VOLTAGE REFERENCE SERIAL DATA TO LTC6802-1 BELOW 68021 TA01a 100k NTC 7 REPRESENTATIVE UNITS 0.20 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 68021 TA01b 100k Rev. B Document Feedback For more information www.analog.com 1 LTC6802-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) Total Supply Voltage (V+ to V–)..................................60V Input Voltage (Relative to V–) C1............................................................. –0.3V to 9V C12........................................... V+ – 0.6V to V+ + 0.3V Cn (Note 5).......................... –0.3V to min (9 • n, 60V) Sn (Note 5).......................... –0.3V to min (9 • n, 60V) CSBO, SCKO, SDOI................... V+ – 0.6V to V+ + 0.3V All other pins............................................ –0.3V to 7V Voltage Between Inputs Cn to Cn-1................................................. –0.3V to 9V Sn to Cn-1................................................. –0.3V to 9V C12 to C8................................................ –0.3V to 25V C8 to C4.................................................. –0.3V to 25V C4 to V–.................................................. –0.3V to 25V Operating Temperature Range..................–40°C to 85°C Specified Temperature Range...................–40°C to 85°C Junction Temperature............................................ 150°C Storage Temperature Range................... –65°C to 150°C TOP VIEW CSBO 1 44 CSBI SDOI 2 43 SDO SCKO 3 42 SDI V+ 4 41 SCKI C12 5 40 VMODE S12 6 39 GPIO2 C11 7 38 GPIO1 S11 8 37 WDTB C10 9 36 MMB S10 10 35 TOS C9 11 34 VREG S9 12 33 VREF C8 13 32 VTEMP2 S8 14 31 VTEMP1 C7 15 30 NC S7 16 29 V– C6 17 28 S1 S6 18 27 C1 C5 19 26 S2 S5 20 25 C2 C4 21 24 S3 S4 22 23 C3 *n = 1 to 12 G PACKAGE 44-LEAD PLASTIC SSOP TJMAX = 150°C, θJA = 70°C/W ORDER INFORMATION TUBE TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6802IG-1#PBF LTC6802IG-1#TRPBF LTC6802G-1 44-Lead Plastic SSOP –40°C to 85°C LTC6802IG-1#3ZZPBF LTC6802IG-1#3ZZTRPBF LTC6802G-1 44-Lead Plastic SSOP –40°C to 85°C Contact the factory for parts specified with wider operating temperature ranges. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Versions of the LTC6802-1 models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are available with #WTRPBF, #WPBF or #ZZPBF suffix and are listed in ADI’s ARPL. Note that these automotive models may have specifications that differ from the commercial models; therefore designers should review the Electrical Characteristics section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. 2 Rev. B For more information www.analog.com LTC6802-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating + – temperature range, otherwise specifications are at TA = 25°C. V = 43.2V, V = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DC Specifications VACC VERR VCELL VCM VREF Measurement Resolution Quantization of the ADC l ADC Offset Voltage (Note 2) l –0.5 0.5 mV ADC Gain Error (Note 2) l –0.12 –0.22 0.12 0.22 % % Total Measurement Error (Note 4) VCELL = 0V VCELL = 2.3V VCELL = 2.3V VCELL = 3.6V VCELL = 3.6V VCELL = 4.2V VCELL = 4.2V VCELL = 4.6V VTEMP = 2.3V VTEMP = 3.6V VTEMP = 4.2V 1.5 l –2.8 –5.1 –4.3 –7.9 –5 –9.2 l l l –5.1 –7.9 –9.2 l l Full Scale Voltage Range Common Mode Voltage Range Measured Relative to V– Range of Inputs CN for