Document 752-1 For Step-Up, Resonant Coupled Inductors LPR6235 & Flyback Applications Can be used as step-up or flyback transformers in DC-DC converters or as autotransformers Perfect for low voltage step-up in energy harvesting applications Selected by Linear Technology for the LTC3108 and LTC3109 Ultralow Voltage Step-Up Converter and Power Managers These shielded parts are only 3.5 mm high and 6 mm square. The excellent coupling coefficient (k = 0.95) makes them ideal for use in a variety of applications. They can be used as flyback transformers and step-up pulse transformers. The high Isat and low DCR ratings of these parts provide high efficiency and excellent current handling in a rug - ged, low cost design. Custom inductance values and turn ratios may be avail- able upon request. DCR max C Primary (L1) SRF D 2 (Ohms) 3 4 Part Turns inductance typ Isat V V IN OUT 1 number ratio 20% (H) L1 L2 (kHz) (A) D Sync LPR6235-253LML 1 : 10 25 0.74 13.7 1300 1.3 Rectifier L1 L2 C LPR6235-253PML 1 : 20 25 0.20 72 580 0.7 C LPR6235-123QML 1 : 50 12.5 0.085 200 360 0.9 LPR6235-752RML 1 : 90 7.5 0.085 285 257 1.6 LPR6235-752SML 1 : 100 7.5 0.085 316 230 1.6 1. When ordering, please specify packaging code: LPR6235-253PMLC Packaging: C = 7 machine-ready reel. EIA-481 embossed plastic tape (350 parts per full reel). Typical Step-Up Converter B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ( 25 charge), use code letter D instead. ++ D = 13 machine-ready reel. EIA-481 embossed plastic D tape. Factory order only, not stocked (1500 parts per full reel). C V L1 L2 OUT 2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent. V IN C 3. SRF measured using an Agilent/HP 4191A or equivalent. 4. DC current applied to L1, at which the inductance drops 10% from its value PWM without current. 5. Electrical specifications at 25C. Refer to Doc 362 Soldering Surface Mount Components before soldering. Typical Flyback Converter Document 752-1 Revised 10/22/13 US +1-847-639-6400 sales coilcraft.com UK +44-1236-730595 sales coilcraft-europe.com Coilcraft Inc. 2013 This product may not be used in medical or high Taiwan +886-2-2264 3646 sales coilcraft.com.tw risk applications without prior Coilcraft approval. China +86-21-6218 8074 sales coilcraft.com.cn Specification subject to change without notice. Singapore + 65-6484 8412 sales coilcraft.com.sg Please check web site for latest information.Document 752-2 Step-Up / Flyback Transformers LPR6235 Dot indicates pin 1 Core material Ferrite Weight 460 480 mg 1 4 Terminations RoHS compliant silver-palladium-platinum-glass frit. 0.236 0.003 Other terminations available at additional cost. L1 L2 6,00 0,08 Ambient temperature 40C to +85C with Irms current, +85C to XXXX +125C with derated current 2 3 Storage temperature Component: 40C to +125C. Tape and reel packaging: 40C to +80C Dash number Winding to winding isolation 300 Vrms Resistance to soldering heat Max three 40 second reflows at +260C, parts cooled to room temperature between cycles 0.138 max 3,50 Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30C / 85% relative humidity) Mean Time Between Failures (MTBF) 26,315,789 hours 0.236 0.003 Recommended 6,00 0,08 Failures in Time (FIT) 38 per one billion hours LandPattern Packaging 350/7 reel 1500/13 reel Plastic tape: 16 mm wide, 1 4 0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth 45 3 2 typ Recommended pick and place nozzle OD: 6.2 mm ID: 3.1 mm 0.047 1,2 PCB washing Tested with pure water or alcohol only. For other solvents, 0.167 0.079 0.260 see Doc787 PCB Washing.pdf. 4,25 2,00 6,60 4 1 3 2 0.079 0.060 2,00 1,52 0.167 4,25 inches Dimensions are in 0.260 mm 6,60 Document 752-2 Revised 10/22/13 US +1-847-639-6400 sales coilcraft.com UK +44-1236-730595 sales coilcraft-europe.com Coilcraft Inc. 2013 This product may not be used in medical or high Taiwan +886-2-2264 3646 sales coilcraft.com.tw risk applications without prior Coilcraft approval. China +86-21-6218 8074 sales coilcraft.com.cn Specification subject to change without notice. Singapore + 65-6484 8412 sales coilcraft.com.sg Please check web site for latest information.