LTC6801 Independent Multicell Battery Stack Fault Monitor FEATURES DESCRIPTION n Monitors Up to 12 Li-Ion Cells in Series (60V Max) The LTC 6801 is a multicell battery monitoring IC in- n Stackable Architecture Enables > 1000V Systems corporating a 12-bit ADC, a precision voltage reference, n 1% Maximum Overvoltage Detection Level Error sampled comparator, and a high voltage input multiplexer. n Adjustable Overvoltage and Undervoltage Detection The LTC6801 can monitor as many as 12 series con- n Self Test Features Guarantee Accuracy nected battery cells for overvoltage, undervoltage, and n Robust Fault Detection Using Differential Signals overtemperature conditions, indicating whether the cells n Simple Pin-Strapped Configuration Allows Battery are within specified parameters. The LTC6801 generates Monitoring without a Microcontroller a clock output when no fault conditions exist. Differential n 15.5ms to Monitor All Cells in a System clocking provides high noise immunity and ensures that n Programmable Response Time battery stack fault conditions cannot be hidden by frozen n Two Temperature Monitor Inputs bits or short circuit conditions. n Low Power Idle Mode Each LTC6801 can operate with a battery stack voltage up n 36-Lead SSOP Package to 60V and multiple LTC6801 devices can be stacked to 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 Redundant Battery Monitor isolators, providing a single status output for the entire n Hybrid Electric Vehicles battery string. 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- L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear port various Li-Ion chemistries. Selectable measurement Technology Corporation. All other 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 6801fc 1 For more information www.linear.com/LTC6801 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 C8 to C4 ................................................. 0.3V to 25V C5 9 28 SLTOK C4 10 27 DC C4 to V ................................................. 0.3V to 25V C3 11 26 EOUT Operating Temperature Range C2 12 25 EOUT LTC6801I .............................................40C to 85C C1 13 24 SIN LTC6801H .......................................... 40C to 125C V 14 23 SIN Specified Temperature Range V 15 22 SOUT TEMP1 LTC6801I .............................................40C to 85C V 16 21 SOUT TEMP2 LTC6801H .......................................... 40C to 125C V 17 20 EIN REF Junction Temperature ........................................... 150C V 18 19 EIN REG Storage Temperature Range .................. 65C to 150C G PACKAGE 36-LEAD PLASTIC SSOP T = 150C, = 70C/W *n = 2 to 12 JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6801IG PBF LTC6801IG TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 85C LTC6801HG PBF LTC6801HG TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: