LT3652HV Power Tracking 2A Battery Charger - …

1 LT3652HV13652hvfbFor more information APPLICATIONDESCRIPTIONP ower Tracking 2A Battery ChargerThe LT 3652HV is a complete monolithic step-down bat-tery Charger that operates over a to 34V input range. The LT3652HV provides a constant-current/constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A. The Charger employs a float voltage feedback reference, so any desired Battery float voltage up to 18V can be programmed with a resistor LT3652HV employs an input voltage regulation loop, which reduces charge current if the input voltage falls below a programmed level, set with a resistor divider.

2 When the LT3652HV is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output LT3652HV can be configured to terminate charging when charge current falls below 1/10 of the programmed maximum (C/10). Once charging is terminated, the LT3652HV enters a low-current (85 A) standby mode. An auto-recharge feature starts a new charging cycle if the Battery voltage falls below the programmed float voltage. The LT3652HV also contains a programmable safety timer, used to terminate charging after a desired time is reached. This allows top-off charging at currents less than C/10.

3 FEATURESAPPLICATIONSn Input Supply Voltage Regulation Loop for Peak Power Tracking in (MPPT) Solar Applicationsn Wide Input Voltage Range: to 34V (40V Abs Max)n Programmable Charge Rate Up to 2An User Selectable Termination: C/10 or On-Board Termination Timern Resistor Programmable Float Voltage Up to 18V Accommodates 4-Cell Li-Ion/Polymer, 5-Cell LiFePO4, Lead-Acid Chemistriesn Parallelable for Higher Output Currentn 1 MHz Fixed Frequencyn Float Voltage Reference Accuracyn 5% Charge Current Accuracyn C/10 Detection Accuracyn Binary-Coded Open-Collector Status Pinsn Thermally Enhanced 3mm 3mm DFN and MSE Packagesn Solar Powered Applicationsn Remote Monitoring Stations n Portable Handheld Instruments n 12V to 24V Automotive Systemsn Battery Charging from Current Limited AdapterL, LT, LTC, LTM.

4 Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective Loop Servos Maximum Charge Current to Prevent AC Adapter Output from Drooping Lower Than 24V 5-Cell LiFePO4 Charger (18V at ) with C/10 Termination Powered by Inexpensive 24 VDC/1A Unregulated Wall ADAPTERINPUT24 VDC AT 1 AVIN_REGVFBBOOSTSENSEBATNTCTIMER1 F10V1N4148127k3652 TA01aR110KB = 338010 F20 H10 F5-CELL LiFePO4 PACK(18V FLOAT)SYSTEMLOAD+ OUTPUT CURRENT (A) OUTPUT VOLTAGE (V) Unregulated Adapter I vs V CharacteristicLT3652HV23652hvfbFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSV oltages: VIN.

5 40V VIN_REG, SHDN, CHRG, FAULT ..VIN + , 40V SW ..40V BOOST ..SW+10V, 50V BAT, SENSE ..20V(Note 1)ORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3652 HVEDD#PBFLT3652 HVEDD#TRPBFLFRG12-Lead Plastic DFN 3mm 3mm 40 C to 125 CLT3652 HVIDD#PBFLT3652 HVIDD#TRPBFLFRG12-Lead Plastic DFN 3mm 3mm 40 C to 125 CLT3652 HVEMSE#PBFLT3652 HVEMSE#TRPBF3652HV12-Lead Plastic MSOP 40 C to 125 CLT3652 HVIMSE#PBFLT3652 HVIMSE#TRPBF3652HV12-Lead Plastic MSOP 40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to.

6 Some packages are available in 500 unit reels through designated sales channels with #TRMPBF VIEWDD PACKAGE12-LEAD (3mm 3mm) PLASTIC DFN1211891045321 SWBOOSTSENSEBATNTCVFBVINVIN_REGSHDNCHRGF AULTTIMER6713 GND123456 VINVIN_REGSHDNCHRGFAULTTIMER121110987 SWBOOSTSENSEBATNTCVFBTOP VIEW13 GNDMSE PACKAGE12-LEAD PLASTIC MSOPTJMAX = 125 C, JA = 43 C/W, JC = 3 C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCBTJMAX = 125 C, JA = 43 C/W, JC = 3 C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB BAT-SENSE .. to + NTC, TIMER, .. VFB ..5 VOperating Junction Temperature Range (Note 2).

7 40 C to 125 CStorage Temperature Range .. 65 C to 150 CLT3652HV33652hvfbFor more information Operating Range VIN Start VoltageVBAT = (Notes 3, 4) VBAT = (Note 4)l VVIN(OVLO)OVLO Threshold OVLO HysteresisVIN Risingl3435 140V VVIN(UVLO)UVLO Threshold UVLO HysteresisVIN VVFB(FLT)Float Voltage Reference(Note 6) V VRECHARGER echarge Reference ThresholdVoltage Relative to VFB(FLT) (Note 6) (PRE)Reference Precondition ThresholdVFB Rising (Note 6) (PREHYST)Reference Precondition Threshold HysteresisVoltage Relative to VFB(PRE) (Note 6)70mVVIN_REG(TH)Input Regulation ReferenceVFB = 3V; VSENSE VBAT = Regulation Reference Bias CurrentVIN_REG = VIN_REG(TH)l35100nAIVINO perating Input Supply CurrentCC/CV Mode, ISW = 0 Standby Mode Shutdown (SHDN = 0) 85 A AIBOOSTBOOST Supply CurrentSwitch On, ISW = 0, < V(BOOST SW) < Switch DriveISW = 2A30mA/AVSW(ON)Switch-On Voltage DropVIN VSW, ISW = 2A350mVISW(MAX)Switch Current (PRE)Precondition Sense VoltageVSENSE VBAT; VFB = 2V15mVVSENSE(DC)Maximum Sense VoltageVSENSE VBAT.

8 VFB = 3V (Note 7)l95100105mVVSENSE(C/10)C/10 Trigger Sense VoltageVSENSE VBAT, Input Bias CurrentCharging AISENSESENSE Input Bias CurrentCharging AIVFBVFB Input Bias CurrentCharging Terminated65nAIVFBVFB Input Bias CurrentCV Operation (Note 5)110nAVNTC(H)NTC Range Limit (High)VNTC (L)NTC Range Limit (Low)VNTC (HYST)NTC Threshold Hysteresis% of threshold20%RNTC(DIS)NTC Disable ImpedanceImpedance to groundl250500k INTCNTC Bias CurrentVNTC = AVSHDNS hutdown (HYST)Shutdown Hysteresis120mVISHDNSHDN Input Bias Current 10nAVCHRG, VFAULTS tatus Low Voltage10mA Current25 AVTIMER(DIS)Timer Disable The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2).

9 VIN = 20V, Boost SW = 4V, SHDN = 2V, VFB = , CTIMER = 0 .6 8 CHARACTERISTICSLT3652HV43652hvfbFor more information Charge Cycle Timeout3hrPrecondition Accuracyl 1010%fOOperating Frequency1 MHzDCDuty Cycle RangeContinuous Operationl1590% The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2). VIN = 20V, Boost SW = 4V, SHDN = 2V, VFB = , CTIMER = 0.

10 6 8 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LT3652HV is tested under pulsed load conditions such that TJ TA. The LT3652 HVE is guaranteed to meet performance specifications from 0 C to 85 C junction temperature. Specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. The LT3652 HVI specifications are guaranteed over the full 40 C to 125 C operating junction temperature range.