LT3652 Power Tracking 2A Battery Charger for Solar Power FEATURES DESCRIPTION n Input Supply Voltage Regulation Loop for Peak The LT 3652 is a complete monolithic step-down bat- Power Tracking in (MPPT) Solar Applications tery charger that operates over a 4.95V to 32V input n Wide Input Voltage Range: 4.95V to 32V (40V Abs Max) voltage range. The LT3652 provides a constant-current/ n Programmable Charge Rate Up to 2A constant-voltage charge characteristic, with maximum n User Selectable Termination: C/10 or On-Board charge current externally programmable up to 2A. The Termination Timer charger employs a 3.3V ofl at voltage feedback reference, n Resistor Programmable Float Voltage Up to 14.4V so any desired battery float voltage up to 14.4V can be Accommodates Li-Ion/Polymer, LiFePO , SLA programmed with a resistor divider. 4 Chemistries The LT3652 employs an input voltage regulation loop, which n No V Blocking Diode Required for Battery IN reduces charge current if the input voltage falls below a Voltages 4.2V programmed level, set with a resistor divider. When the n 1MHz Fixed Frequency LT3652 is powered by a solar panel, the input regulation n 0.5% Float Voltage Reference Accuracy loop is used to maintain the panel at peak output power. n 5% Charge Current Accuracy n The LT3652 can be configured to terminate charging 2.5% C/10 Detection Accuracy n when charge current falls below 1/10 of the programmed Binary-Coded Open-Collector Status Pins n maximum (C/10). Once charging is terminated, the LT3652 Thermally Enhanced 12-Lead 3mm 3mm DFN and enters a low-current (85A) standby mode. An auto-re- MSE Packages charge feature starts a new charging cycle if the battery APPLICATIONS voltage falls 2.5% below the programmed float voltage. n The LT3652 also contains a programmable safety timer, Solar Powered Applications n used to terminate charging after a desired time is reached. Remote Monitoring Stations n This allows top-off charging at currents less than C/10. LiFePO (Lithium Phosphate) Applications 4 n Portable Handheld Instruments L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the n 12V to 24V Automotive Systems property of their respective owners. Solar Panel Input Voltage Regulation, Tracks Max Power TYPICAL APPLICATION Point to Greater Than 98% 2A Solar Panel Power Manager With 7.2V LiFePO Battery 4 22 and 17V Peak Power Tracking T = 25C A CMSH1-40MA SOLAR PANEL INPUT 20 SYSTEM LOAD (<40V OC VOLTAGE) CMSH3-40MA 10F 18 100% TO 98% PEAK POWER 530k CMSH3-40MA V SW IN LT3652 1F 10H 16 V IN REG BOOST 0.05 98% TO 95% PEAK POWER 100k SHDN SENSE 14 CHRG BAT FAULT 10F 542k NTC TIMER 12 V FB 459k + 10k 10 B = 3380 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 CHARGER OUTPUT CURRENT (A) 2-CELL LiFePO (2 3.6V) BATTERY PACK 4 3652 TA01b 3652 TA01a 3652fe 1 For more information www.linear.com/LT3652 INPUT REGULATION VOLTAGE (V)LT3652 ABSOLUTE MAXIMUM RATINGS (Note 1) BAT-SENSE ......................................... 0.5V to +0.5V Voltages: NTC, TIMER, ........................................................2.5V V ........................................................................40V IN V ..........................................................................5V V , SHDN, CHRG, FAULT ............ V + 0.5V, 40V IN REG IN FB Operating Junction Temperature Range SW ........................................................................40V (Note 2) ............................................. 40C to 125C SW-V .................................................................4.5V IN Storage Temperature Range ................... 65C to 150C BOOST ...................................................SW+10V, 50V BAT, SENSE ...........................................................15V PIN CONFIGURATION TOP VIEW TOP VIEW 1 12 SW V IN V 1 12 SW IN 2 V 11 BOOST IN REG V 2 11 BOOST IN REG 3 SHDN 13 10 SENSE 3 SHDN 13 10 SENSE GND 4 9 BAT CHRG 4 GND CHRG 9 BAT 5 8 NTC 5 8 NTC FAULT FAULT TIMER 6 7 V FB 6 7 TIMER V FB MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 12-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 43C/W, = 3C/W T = 125C, = 43C/W, = 3C/W JMAX JA JC JMAX JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3652EDD PBF LT3652EDD TRPBF LFHT 12-Lead Plastic DFN 3mm 3mm 40C to 125C LT3652IDD PBF LT3652IDD TRPBF LFHT 12-Lead Plastic DFN 3mm 3mm 40C to 125C LT3652EMSE PBF LT3652EMSE TRPBF 3652 12-Lead Plastic MSOP 40C to 125C LT3652IMSE PBF LT3652IMSE TRPBF 3652 12-Lead Plastic MSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: