LTC4071 Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect FEATURES DESCRIPTION n Charger Plus Pack Protection in One IC The LTC 4071 allows simple charging of Li-Ion/Polymer n batteries from very low current, intermittent or continuous Low Operating Current (550nA) n charging sources. A near-zero current low battery latch- Near Zero Current (<0.1nA) Low Battery Disconnect ing disconnect function protects even the lowest capacity Function to Protect Batteries from Over-Discharge n batteries from deep discharge and potentially irreparable Pin Selectable Low Battery Disconnect Level: damage. The 550nA to 50mA operating current makes 2.7V or 3.2V n charging possible from previously unusable sources. With 1% Float Voltage Accuracy Over Temperature n its low operating current the LTC4071 is well suited to 50mA Maximum Internal Shunt Current n charge low capacity Li-Ion or thin film batteries in energy Pin Selectable Float Voltage Options: 4.0V, 4.1V, 4.2V harvesting applications. The unique architecture of the n Ultralow Power Pulsed NTC Float Conditioning for LTC4071 allows for an extremely simple battery charger Li-Ion/Polymer Protection solution, requiring just one external resistor. n Suitable for Intermittent, Continuous and Very Low Power Charging Sources The LTC4071 offers a pin selectable float voltage with n High Battery Status Output 1% accuracy. The integrated thermal battery quali- n Thermally Enhanced, Low Profile (0.75mm) fier extends battery lifetime and improves reliability by 8-Lead (2mm 3mm) DFN and MSOP Packages automatically reducing the battery float voltage at NTC thermistor temperatures above 40C. The LTC4071 also provides two pin selectable low battery disconnect levels APPLICATIONS and a high battery status output. n Low Capacity, Li-Ion/Polymer Battery Back-Up The device is offered in two thermally enhanced packages, n Thin Film Batteries a compact low profile (0.75mm) 8-lead (2mm 3mm) n Energy Scavenging/Harvesting DFN and an 8-lead MSOP package. n Solar Power Systems with Back-Up All registered trademarks and trademarks are the property of their respective owners. n Memory Back-Up n Embedded Automotive TYPICAL APPLICATION Battery Disconnect I vs Temperature LEAK 100n V IN V = 2.65V BAT R 10n IN TO SYSTEM LOAD: V CC 1n V CC ADJ BAT NTC LTC4071 100p 1F 10p + LBSEL Li-Ion GND 1p 4071 TA01a 0.1p 25 0 25 50 75 100 125 TEMPERATURE (C) 4071 TA01b Rev. D 1 Document Feedback For more information www.analog.com I (A) LEAKLTC4071 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) I , I .............................................60mA Continuous LBSEL Voltage ............................................. 0.3V to 6V CC BAT I ...............................400mA for Single Pulse < 10ms Operating Junction Temperature Range .. 40C to 125C BAT I ...............................400mA for Single Pulse < 10ms Storage Temperature Range .................. 65C to 150C CC ADJ, NTC, NTCBIAS, HBO Voltages .. 0.3V to V + 0.3V Peak Reflow Temperature .....................................260C CC PIN CONFIGURATION TOP VIEW TOP VIEW NTCBIAS 1 8 V CC NTCBIAS 1 8 V CC NTC 2 7 BAT 9 NTC 2 7 BAT 9 GND ADJ 3 6 GND ADJ GND 3 6 GND HBO 4 5 LBSEL HBO 4 5 LBSEL MS8E PACKAGE 8-LEAD PLASTIC MSOP DDB PACKAGE 8-LEAD (3mm 2mm) PLASTIC DFN T = 125C, = 40C/W JMAX JA EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED, T = 125C, = 76C/W MUST BE SOLDERED TO PCB, GND TO OBTAIN JA JMAX JA EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED, MUST BE SOLDERED TO PCB, GND TO OBTAIN JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL TAPE AND REEL (MINI) PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4071EDD TRPBF LTC4071EDD TRMPBF LFXF 8-Lead Plastic DFN 40C to 125C LTC4071IDD TRPBF LTC4071IDD TRMPBF LFXF 8-Lead Plastic DFN 40C to 125C LTC4071EMS8E PBF LTC4071EMS8E TRPBF LTFXG 8-Lead Plastic MSOP 40C to 125C LTC4071IMS8E PBF LTC4071IMS8E TRPBF LTFXG 8-Lead Plastic MSOP 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating junction temperature range. Conditions are V = V = V , V = GND, T = 25C unless otherwise specified. Current into a pin NTC ADJ CC LBSEL A is positive and current out of a pin is negative. All voltages are referenced to GND unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Programmable Float Voltage V = 0V, 0C < Temp < 125C 3.96 4.0 4.04 V FLOAT ADJ l 10A I 25mA V = 0V 3.88 4.0 4.04 V CC ADJ V = Float, 0C < Temp < 125C 4.06 4.1 4.14 V ADJ V = Float l 3.98 4.1 4.14 V ADJ V = V , 0C < Temp < 125C 4.16 4.2 4.24 V ADJ CC l V = V 4.07 4.2 4.24 V ADJ CC I Maximum Shunt Current V > V l 50 mA CCMAX CC FLOAT l I V Operating Current V Low, ADJ = V 550 1200 nA CCQ CC HBO CC Rev. D 2 For more information www.analog.com