LT3652HV Power Tracking 2A Battery Charger FEATURES DESCRIPTION n Input Supply Voltage Regulation Loop for Peak The LT 3652HV is a complete monolithic step-down bat- Power Tracking in (MPPT) Solar Applications tery charger that operates over a 4.95V to 34V input range. n The LT3652HV provides a constant-current/constant-voltage Wide Input Voltage Range: 4.95V to 34V (40V Abs Max) n charge characteristic, with maximum charge current Programmable Charge Rate Up to 2A n externally programmable up to 2A. The charger employs User Selectable Termination: C/10 or On-Board a 3.3V float voltage feedback reference, so any desired Termination Timer n battery ofl at voltage up to 18V can be programmed with a Resistor Programmable Float Voltage Up to 18V resistor divider. Accommodates 4-Cell Li-Ion/Polymer, 5-Cell LiFePO , Lead-Acid Chemistries 4 The LT3652HV employs an input voltage regulation loop, n Parallelable for Higher Output Current which reduces charge current if the input voltage falls below n 1MHz Fixed Frequency a programmed level, set with a resistor divider. When the n 0.5% Float Voltage Reference Accuracy LT3652HV is powered by a solar panel, the input regulation n 5% Charge Current Accuracy loop is used to maintain the panel at peak output power. n 2.5% C/10 Detection Accuracy The LT3652HV can be congfi ured to terminate charging when n Binary-Coded Open-Collector Status Pins charge current falls below 1/10 of the programmed maximum n Thermally Enhanced 3mm 3mm DFN and MSE (C/10). Once charging is terminated, the LT3652HV enters a Packages low-current (85A) standby mode. An auto-recharge feature starts a new charging cycle if the battery voltage falls 2.5% APPLICATIONS below the programmed float voltage. The LT3652HV also n Solar Powered Applications contains a programmable safety timer, used to terminate n Remote Monitoring Stations charging after a desired time is reached. This allows top-off n Portable Handheld Instruments charging at currents less than C/10. n 12V to 24V Automotive Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Battery Charging from Current Limited Adapter PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V Loop Servos Maximum Charge Current to Prevent AC Adapter Output from 1A/24VDC Unregulated Adapter IN REG Drooping Lower Than 24V 5-Cell LiFePO Charger (18V at 1.5A) with C/10 Termination I vs V Characteristic 4 Powered by Inexpensive 24VDC/1A Unregulated Wall Adapter. 36 33 D3 MBRS340 MBRS340 AC ADAPTER 30 INPUT SW V IN LT3652HV 24VDC AT 1A 10V 750k 1F 1N4148 27 V 20H IN REG BOOST 44.2k 24 0.068 10F SHDN SYSTEM SENSE LOAD 21 51.1k CHRG BAT 18 FAULT NTC 665k + 127k 15 TIMER 10F V FB 12 3652 TA01a 150k 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 R1 ADAPTER OUTPUT CURRENT (A) 10K B = 3380 5-CELL LiFePO PACK 4 3652 TA01b (18V FLOAT) 3652hvfb 1 For more information www.linear.com/LT3652HV ADAPTER OUTPUT VOLTAGE (V)LT3652HV 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 ...........................................................20V 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 13 SHDN 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 LT3652HVEDD PBF LT3652HVEDD TRPBF LFRG 12-Lead Plastic DFN 3mm 3mm 40C to 125C LT3652HVIDD PBF LT3652HVIDD TRPBF LFRG 12-Lead Plastic DFN 3mm 3mm 40C to 125C LT3652HVEMSE PBF LT3652HVEMSE TRPBF 3652HV 12-Lead Plastic MSOP 40C to 125C LT3652HVIMSE PBF LT3652HVIMSE TRPBF 3652HV 12-Lead Plastic MSOP 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. 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