0 LTC4070 Li-Ion/Polymer Shunt Battery Charger System FEATURES DESCRIPTION n Low Operating Current (450nA) The LTC 4070 allows simple charging of Li-Ion/Polymer n 1% Float Voltage Accuracy Over Full Temperature batteries from very low current, intermittent or continu- and Shunt Current Range ous charging sources. The 450nA to 50mA operating cur- n 50mA Maximum Internal Shunt Current rent makes charging possible from previously unusable (500mA with External PFET) sources. With the addition of an external pass device, n Pin Selectable Float Voltage Options: shunt current may be boosted to 500mA. Stacked cell high 4.0V, 4.1V, 4.2V voltage battery packs are inherently balanced with shunt n Ultralow Power Pulsed NTC Float Conditioning for charging. With its low operating current, the LTC4070 is Li-Ion/Polymer Protection well suited to charge thin film batteries in energy harvest- n Suitable for Intermittent, Continuous and Very Low ing applications where charging sources may be intermit- Power Charging Sources tent or very low power. The unique architecture of the n Low and High Battery Status Outputs LTC4070 allows for an extremely simple battery charger n Simple Low Voltage Load Disconnect Application solution requiring just one external resistor. n Thermally Enhanced, Low Profile (0.75mm) The LTC4070 offers a pin selectable float voltage with 1% 8-Lead (2mm 3mm) DFN and MSOP Packages accuracy across the full range of operating temperature and shunt current. The integrated thermal battery quali- fier extends battery lifetime and improves reliability by APPLICATIONS automatically reducing the battery float voltage at NTC n Low Power Li-Ion/Polymer Battery Back-Up thermistor temperatures above 40C. The LTC4070 also n Solar Power Systems with Back-Up provides both low and high battery status outputs. For n Memory Back-Up applications requiring pack protection, see LTC4071. n Embedded Automotive n Thin Film Batteries The device is offered in two thermally enhanced packages, n Energy Scavenging/Harvesting a compact low profile (0.75mm) 8-lead (2mm 3mm) DFN and an 8-lead MSOP package. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION NTC Overtemperature Battery Float Voltage Qualifying Simple Shunt Charger with Load Disconnect and NTC Conditioning 4.3 V IN ADJ = V CC 4.2 R IN Q1:FDR8508 ADJ = FLOAT 4.1 V CC LBO ADJ = GND 4.0 ADJ NTCBIAS LTC4070 10k 3.9 NTC GND 3.8 + T Li-Ion 3.7 20 40 60 80 100 NTHS0805N02N1002F 4070 TA01a TEMPERATURE (C) 4070 TA01b Rev. D 1 Document Feedback For more information www.analog.com V (V) FLTC4070 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) I ....................................................................... 60mA Maximum Junction Temperature ......................... 125C CC ADJ, NTC, NTCBIAS, DRV, LBO, HBO Storage Temperature Range .................. 65C to 150C Voltages ...........................................0.3V to V + 0.3V Peak Reflow Temperature .....................................260C CC Operating Junction Temperature Range .. 40C to 125C PIN CONFIGURATION TOP VIEW TOP VIEW NTCBIAS 1 8 V CC NTCBIAS 1 8 V CC NTC 2 7 DRV 7 DRV NTC 2 9 9 ADJ 3 6 LBO ADJ 3 6 LBO HBO 4 5 GND HBO 4 5 GND 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, MUST BE SOLDERED TO PCB, GND TO OBTAIN T = 125C, = 76C/W 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 PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4070EDDB TRMPBF LTC4070EDDB TRPBF LFPD 8-Lead (3mm 2mm) Plastic DFN 40C to 125C LTC4070IDDB TRMPBF LTC4070IDDB TRPBF LFPD 8-Lead (3mm 2mm) Plastic DFN 40C to 125C LTC4070EMS8E TRMPBF LTC4070EMS8E TRPBF LTFMT 8-Lead Plastic MSOP 40C to 125C LTC4070IMS8E TRMPBF LTC4070IMS8E TRPBF LTFMT 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 CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range. V = V , T = 25C unless otherwise specified. Current into a pin is positive and current out of a pin is NTC CC A 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 l 3.96 4.0 4.04 V FLOAT ADJ 10A I 50mA V = Float l 4.06 4.1 4.14 V CC ADJ V = V l 4.16 4.2 4.24 V ADJ CC l I Maximum Shunt Current V > V 50 mA CCMAX CC FLOAT I V Operating Current V Low l 450 1040 nA CCQ CC HBO I Low Bat V Operating Current V = 3.1V 300 nA CCQLB CC CC Rev. D 2 For more information www.analog.com