lt3652hv Linear Technology Corporation, lt3652hv Datasheet
lt3652hv
Available stocks
Related parts for lt3652hv
lt3652hv Summary of contents
Page 1
... When the LT3652HV is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output power. The LT3652HV can be confi gured 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 (85μ ...
Page 2
... LT3652HVEDD#TRPBF LT3652HVIDD#PBF LT3652HVIDD#TRPBF LT3652HVEMSE#PBF LT3652HVEMSE#TRPBF 3652HV LT3652HVIMSE#PBF LT3652HVIMSE#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...
Page 3
... SENSE BAT FB V – Falling SENSE BAT Charging Terminated Charging Terminated Charging Terminated CV Operation (Note 5) V Rising NTC V Falling NTC % of threshold Impedance to ground V = 0.8V NTC Rising 10mA Load LT3652HV = 3.3V 0.68μF. FB TIMER MIN TYP MAX UNITS 4.6 4.95 V ...
Page 4
... Note 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 lifetime. Note 2: The LT3652HV is tested under pulsed load conditions such that T ≅ The LT3652HVE is guaranteed to meet performance specifi cations ...
Page 5
... G03 12 BAT(PRE BAT BAT(FLT –50 2 2.5 (V) 3652 G05 LT3652HV T = 25°C, unless otherwise noted Standby Mode Current IN vs Temperature 100 125 100 – –25 TEMPERATURE (°C) 3652 G01a Switch Forward Drop (V – ...
Page 6
... LT3652HV TYPICAL PERFORMANCE CHARACTERISTICS Maximum Charge Current (V – Temperature SENSE BAT 101 100.8 100.6 100.4 100.2 100.0 99.8 99.6 99.4 99.2 99.0 50 –50 – 100 TEMPERATURE (°C) 3652 G07 Maximum Charge Current (V – SENSE BAT 100 2.65 2.66 2.67 2.68 2.69 2.7 V IN_REG Charge Current, Effi ciency, and ...
Page 7
... Connecting a resistor divider from V programming of minimum operational V is typically used to program the peak power voltage for a solar panel. The LT3652HV servos the maximum charge current required to maintain the programmed operational V voltage, through maintaining the voltage above 2 ...
Page 8
... LT3652HV PIN FUNCTIONS NTC (Pin 8): Battery Temperature Monitor Pin. This pin is the input to the NTC (Negative Temperature Coeffi cient) thermistor temperature monitoring circuit. This function is enabled by connecting a 10kΩ 3380 NTC thermistor from the NTC pin to ground. The pin sources 50μA, and monitors the voltage across the 10kΩ ...
Page 9
... S Q OSC 1MHz + – – C-EA STANDBY + + – 0. × – + 0.1V 1V 0.15V V INT x2.25 2.7V STANDBY 1.2V 1.36V 50μA – 0.29V + 46μA LT3652HV V IN_REG + – 2.7V 4.6V BOOST + – 35V + 10mΩ – 30mV SENSE R S BAT OFFSET V FB – V-EA + – + 2.3V SHDN – ...
Page 10
... The LT3652HV employs an input voltage regulation loop, which reduces charge current if a monitored input voltage falls below a programmed level. When the LT3652HV is powered by a solar panel, the input regulation loop is used to maintain the panel at peak output power. ...
Page 11
... Once the charge cycle is terminated, the CHRG status pin becomes high-impedance and the charger enters low-current standby mode. The LT3652HV contains an internal charge cycle timer that terminates a successful charge cycle after a programmed amount of time. This timer is typically programmed to ...
Page 12
... If there is no BOOST supply available, the internal switch requires (V to reliably operate. This requirement does not exist if the BOOST supply is available and (V When an LT3652HV charger is not switching, the SW pin R SENSE is at the same potential as the battery, which can be as high as V supply must be at least 3 ...
Page 13
... Status Pins section desired to operate a system load from the LT3652HV charger output when the battery is disconnected, additional bypass capacitance is required. In this type of application, excessive ripple and/or low amplitude oscillations can oc- cur without additional output bulk capacitance. For these applications, place a 100μ ...
Page 14
... Solving for (Ω) R FB1 R FB1 The divider equivalent resistance is FB1 BAT(FLT rate of: RFB FB2 applications, it may be BAT(FLT achieve the required 250k FB3 BAT + LT3652HV R FB1 R FB3 V FB 3652 F05 R FB2 and R FB1 FB2 = 3.3/(V – 3.3) BAT(FLT) = 3.6V 3.3/(3.6 - 3.3) = 11. FB1 ) = 10μA yields: RFB = 3.3/10μ ...
Page 15
... Maximum charge current is reduced when the V is below the regulation threshold of 2.7V input supply cannot provide enough power to satisfy the requirements of an LT3652HV charger, the supply volt- age will collapse. A minimum operating supply voltage can thus be programmed by monitoring the supply through a resistor divider, such that the desired minimum voltage corresponds to 2 ...
Page 16
... For example, a 6-cell lead acid battery has a float charge 3658 F08 voltage that is commonly specified at 2.25V/cell at 25°C, or 13.5V, and a –3.3mV/°C per cell temperature coefficient, or –19.8mV/°C. Using the feedback network shown in Figure 9, with the desired temperature coefficient (TC) )]/V } – 1) SET IN_REG LT3652HV 14 14.2 14.0 is similar to that MP 13 ...
Page 17
... ON indicates pin pulled low, and OFF indicates pin high-impedance: STATUS PINS STATE CHRG OFF OFF – × the battery is removed from an LT3652HV charger that is configured for C/10 termination, a sawtooth waveform 14.8 14.6 6-CELL LEAD-ACID 14.4 BATTERY + 14.2 14.0 13.8 22k B = 3380 13 ...
Page 18
... C/10 threshold. The charger continues to . SENSE top-off the battery until timer EOC, when the LT3652HV terminates the charging cycle and enters standby mode. Termination at the end of the timer cycle only occurs if the charging cycle was successful. A successful charge cycle is when the battery is charged to within 2 ...
Page 19
... LT3652HV will suspend charging and enter standby mode until the excessive temperature condition is relieved. Layout Considerations The LT3652HV switch node has rise and fall times that are typically less than 10nS to maximize conversion efficiency. The switch node (Pin SW) trace should be kept as short as possible to minimize high frequency noise ...
Page 20
... Schottky diode (D both cases, these switch currents return to ground via the output bypass capacitor (C The LT3652HV packaging has been designed to efficiently remove heat from the IC via the Exposed Pad on the backside of the package, which is soldered to a copper footprint on the PCB ...
Page 21
... CMDSH2-4L 1μF V IN_REG BOOST SHDN SENSE 10μF CHRG BAT FAULT NTC TIMER V FB 223k 3652 TA05 LT3652HV Solar Panel Input Voltage Regulation, Tracks Max Power Point to Greater Than 98 25° 100% TO 98% PEAK POWER 16 98% TO 95% PEAK POWER 0.2 ...
Page 22
... LT3652HV PACKAGE DESCRIPTION 3.50 ±0.05 2.10 ±0.05 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH ...
Page 23
... MAX SEATING PLANE 0.22 – 0.38 (.009 – .015) 0.650 TYP (.0256) BSC LT3652HV 6 0.35 REF 0.12 REF DETAIL “B” CORNER TAIL IS PART OF THE LEADFRAME FEATURE. DETAIL “B” FOR REFERENCE ONLY 7 NO MEASUREMENT PURPOSE 0.406 0.076 ( ...
Page 24
... LTC4012/LTC4012-1/ 4A, High Efficiency, Multi-Chemistry LTC4012-2/ LTC4012-3 Battery Charger with PowerPath™ Control Linear Technology Corporation 24 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● LT3652HV 1μF 1N4148 BZX84C6V2L V IN_REG BOOST SHDN SENSE CHRG BAT 910 309k NTC FAULT ...