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LT3652IMSE Datasheet(PDF) 1 Page - Linear Technology |
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LT3652IMSE Datasheet(HTML) 1 Page - Linear Technology |
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1 / 26 page  LT3652 1 3652fb TYPICAL APPLICATION DESCRIPTION Power Tracking 2A Battery Charger for Solar Power The LT®3652 is a complete monolithic step-down bat- tery charger that operates over a 4.95V to 32V input voltage range. The LT3652 provides a constant-current/ constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A. The charger employs a 3.3V float voltage feedback reference, so any desired battery float voltage up to 14.4V can be programmed with a resistor divider. The LT3652 employs an input voltage regulation loop, which reduces charge current if the input voltage falls below a programmed level, set with a resistor divider. When the LT3652 is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output power. The LT3652 can be configured to terminate charging when charge current falls below 1/10 of the programmed maximum (C/10). Once charging is terminated, the LT3652 enters a low-current (85μA) standby mode. An auto-re- charge feature starts a new charging cycle if the battery voltage falls 2.5% below the programmed float voltage. The LT3652 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. 2A Solar Panel Power Manager With 7.2V LiFePO4 Battery and 17V Peak Power Tracking FEATURES APPLICATIONS n Input Supply Voltage Regulation Loop for Peak Power Tracking in (MPPT) Solar Applications n Wide Input Voltage Range: 4.95V to 32V (40V Abs Max) n Programmable Charge Rate Up to 2A n User Selectable Termination: C/10 or On-Board Termination Timer n Resistor Programmable Float Voltage Up to 14.4V Accommodates Li-Ion/Polymer, LiFePO4, SLA, NiMH/NiCd Chemistries n No VIN Blocking Diode Required for Battery Voltages ≤ 4.2V n 1MHz Fixed Frequency n 0.5% Float Voltage Reference Accuracy n 5% Charge Current Accuracy n 2.5% C/10 Detection Accuracy n Binary-Coded Open-Collector Status Pins n 3mm × 3mm DFN12 or MSOP-12 Packages n Solar Powered Applications n Remote Monitoring Stations n LiFePO4 (Lithium Phosphate) Applications n Portable Handheld Instruments n 12V to 24V Automotive Systems Solar Panel Input Voltage Regulation, Tracks Max Power Point to Greater Than 98% SW VIN SOLAR PANEL INPUT (<40V OC VOLTAGE) VIN_REG VFB BOOST SENSE BAT NTC TIMER CMSH3-40MA SYSTEM LOAD 1μF 542k 459k 3652 TA01a 10k B = 3380 2-CELL LiFePO4 (2 × 3.6V) BATTERY PACK + 10μF CMSH1-40MA 10μF 10μH 0.05 LT3652 530k 100k SHDN CHRG FAULT CMSH3-40MA CHARGER OUTPUT CURRENT (A) 0.2 10 12 14 20 18 16 0.6 1 1.2 3652 TA01b 22 0.4 0.8 1.6 1.4 2 1.8 100% TO 98% PEAK POWER 98% TO 95% PEAK POWER TA = 25°C L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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