LTC6801 Independent Multicell Battery Stack Fault Monitor FEATURES DESCRIPTION n Qualified for Automotive Applications The LTC 6801 is a multicell battery monitoring IC incor- n Monitors Up to 12 Li-Ion Cells in Series (60V Max) porating a 12-bit ADC, a precision voltage reference, sam- n Stackable Architecture Enables > 1000V Systems pled comparator, and a high voltage input multiplexer. The n 1% Maximum Overvoltage Detection Level Error LTC6801 can monitor as many as 12 series connected n Adjustable Overvoltage and Undervoltage Detection battery cells for overvoltage, undervoltage, and over- n Self Test Features Guarantee Accuracy temperature conditions, indicating whether the cells are n Robust Fault Detection Using Differential Signals within specified parameters. The LTC6801 generates a n Simple Pin-Strapped Configuration Allows Battery clock output when no fault conditions exist. Differential Monitoring without a Microcontroller clocking provides high noise immunity and ensures that n 15.5ms to Monitor All Cells in a System battery stack fault conditions cannot be hidden by frozen n Programmable Response Time bits or short circuit conditions. n Two Temperature Monitor Inputs Each LTC6801 can operate with a battery stack voltage up n Low Power Idle Mode to 60V and multiple LTC6801 devices can be stacked to n 36-Lead SSOP Package monitor each individual cell in a long battery string. When multiple devices are stacked, the status signal of each APPLICATIONS LTC6801 can be daisy-chained, without opto-couplers or n isolators, providing a single status output for the entire Redundant Battery Monitor n battery string. Hybrid Electric Vehicles n Battery Backup Systems The LTC6801 is configurable by external pin strapping. n Power Systems Using Multiple Battery Cells Adjustable overvoltage and undervoltage thresholds sup- port various Li-Ion chemistries. Selectable measurement All registered trademarks and trademarks are the property of their respective owners. times allow users to save power. BLOCK DIAGRAM 0V Detection Level Error NEXT HIGHER LTC6801 CELL PACK + 1 V 1.0 + V = 43.2V 0.8 OV = 4.116V C12 2 0.6 5 TYPICAL UNITS C11 0.4 3 0.2 CONTROL LOGIC 0 12 ADC MUX C2 0.2 ENABLE 12 ISOLATION INPUT 0.4 20 CELLS GOOD C1 13 CLOCK SIGNAL 0.6 INPUT ENABLES 0.8 THE LTC6801 V 14 1.0 40 25 10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 22 NEXT LOWER 6801 TA01b REFERENCE STATUS CELL PACK CLOCK SIGNAL V V V TEMP1 TEMP2 REF OUTPUT OUTPUT INDICATES 15 16 17 SYSTEM OK 6801 TA01a NTC NTC Rev. D 1 Document Feedback For more information www.analog.com ERROR (%)LTC6801 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW + Total Supply Voltage (V to V ) .................................60V + V 1 36 OV1 Input Voltage (Relative to V ) C12 2 35 OV0 C1 ............................................................ 0.3V to 9V C11 3 34 UV1 + + C12 ...........................................V 0.3V to V + 0.3V C10 4 33 UV0 All Other Pins (Not C Inputs) ................... 0.3V to 7V C9 5 32 HYST Voltage Between Inputs C8 6 31 CC1 Cn to Cn-1* .............................................. 0.3V to 9V C7 7 30 CC0 C12 to C8 ............................................... 0.3V to 25V C6 8 29 SLT SLTOK C8 to C4 ................................................. 0.3V to 25V C5 9 28 DC C4 10 27 C4 to V ................................................. 0.3V to 25V EOUT C3 11 26 Operating Temperature Range 12 EOUT C2 25 LTC6801I .............................................40C to 85C 13 SIN C1 24 LTC6801H .......................................... 40C to 125C 14 SIN V 23 Specified Temperature Range 15 SOUT V 22 TEMP1 LTC6801I .............................................40C to 85C 16 SOUT V 21 TEMP2 LTC6801H .......................................... 40C to 125C 17 EIN V 20 REF Junction Temperature ........................................... 150C 18 EIN V 19 REG Storage Temperature Range .................. 65C to 150C G PACKAGE 36-LEAD PLASTIC SSOP T = 150C, = 70C/W JMAX JA *n = 2 to 12 ORDER INFORMATION TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6801IG PBF LTC6801IG TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 85C LTC6801IG 3ZZPBF LTC6801IG 3ZZTRPBF LTC6801G 36-Lead Plastic SSOP 40C to 85C LTC6801HG PBF LTC6801HG TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 125C LTC6801HG 3ZZPBF LTC6801HG 3ZZTRPBF LTC6801G 36-Lead Plastic SSOP 40C to 125C 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 LTC6801 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 ADIs 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 thesemodels. Rev. D 2 For more information www.analog.com