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LT1239 Datasheet(PDF) 1 Page - Linear Technology |
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LT1239 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1239 Backup Battery Management Circuit I Micropower Operation (IQ = 20µA) I Adjustable Regulator for Battery Charging I 4.85V Regulator for Battery Regulation I Cell Voltage Equalization in 2-Cell Systems I Low-Battery Detector Protects Lithium Cells I Comparator for Automatic Power Switching I Shutdown I Output Current Sensing I Current and Thermal Limiting I Reverse Output Protection I 16-Pin SO Package I Operates on 7V to 30V Input The LT®1239 is a micropower backup battery manage- ment system for portable computers and instrumenta- tion. It contains two regulators for regulating the battery voltage and memory voltage and a comparator for switch- ing between main power and backup power. The first regulator provides a constant voltage charge for the backup batteries and is adjustable from 3.75V up to 20V. An equalization amplifier combined with the first regulator provides precision charge equalization for a 2-cell lithium-ion system. A second regulator with 4.85V output providesaregulatedbackupbatteryvoltagetothememory when main power is lost. The second regulator also isolates the backup battery from the main 5V supply during normal operation when the memory is being pow- ered by the 5V supply. A comparator is included which provides automatic switchover from main 5V power to backup power ensur- ing uninterrupted power for memory and power monitor- FEATURES DESCRIPTION I Backup Battery Management Systems for Portable Computers I Lithium-Ion Backup Systems I NiCd Backup Systems APPLICATIONS TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. Lithium-Ion Backup System 604k 1% 69.8k 1% 681k 1% 22 µF 3.4V Li-Ion CELL 3.4V Li-Ion CELL E/A (IN) E/A (OUT) 5VIN OUT 1 ADJ IMON1 300pF INPUT 2 120 Ω* 120Ω* INPUT 2 OUT 2 IMON2 SHDN1 IN MAIN BATTERY PACK 7V TO 24V INPUT 1 22 µF INPUT 1 SHDN2 OUT IN GND GND GND GND GND * REQUIRED BY SOME SAFETY AGENCIES SEE APPLICATIONS INFORMATION FOR INFORMATION ON SELECTING VALUES. LTC1239 • TA01 – + 5V SYSTEM POWER MEMORY POWER MANAGEMENT LOW-BATTERY DETECT + + 11 1 7 8 15 16 13 12 10 2 4 5 6 14 3 REGULATOR #1 REGULATOR #2 FOR INFORMATION PURPOSES ONLY OBSOLETE: Contact Linear Technology for Potential Replacement |
Similar Part No. - LT1239_02 |
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Similar Description - LT1239_02 |
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