Document 713-1 For Step-Up, Resonant Coupled Inductors LPR4012 & Flyback Applications The LPR4012 miniature shielded coupled inductors are only 1,1 mm high and 4 mm square. The excellent coupling coefficient (k = 0.95) makes them ideal for use as flyback transformers in DC-DC converters or as coupled inductors in buck regulators to provide multiple outputs. The wide selection of turns ratios makes them suitable for a variety of voltage step-up and step-down applications. They can also be used in autotransformer applications. The high Isat and low DCR ratings of these low profile parts provide high efficiency and excellent current handling in a rugged, low cost design. Custom inductance values and turn ratios are available upon request. Primary (L1) SRF 4 5 2 3 DCR max (Ohms) Isat (A) Irms (A) inductance Turns typ 1 Part number 20% (H) ratio L1 L2 (MHz) 10% drop 20% drop 30% drop 20C rise 40C rise LPR4012-202AML 2.0 1 : 1.5 0.240 0.325 61.5 1.70 1.73 1.74 1.10 1.45 LPR4012-202BML 2.0 1 : 2 0.240 0.480 49.4 1.70 1.73 1.74 1.10 1.45 LPR4012-202DML 2.0 1 : 3 0.240 1.15 31.0 1.70 1.73 1.74 1.10 1.45 LPR4012-202LML 2.0 1 : 10 0.240 11.62 7.43 1.70 1.73 1.74 1.10 1.45 LPR4012-103BML 10.0 1 : 2 0.600 1.55 19.5 0.62 0.64 0.65 0.52 0.70 LPR4012-103DML 10.0 1 : 3 0.600 3.71 12.8 0.62 0.64 0.65 0.52 0.70 LPR4012-223BML 22.0 1 : 2 1.16 3.65 11.2 0.43 0.45 0.46 0.43 0.57 LPR4012-223DML 22.0 1 : 3 1.16 7.08 8.00 0.43 0.45 0.46 0.43 0.57 1. When ordering, please specify termination and packaging codes: LPR4012-223XMLC Termination: L = RoHS compliant Silver-palladium-platinum-glass frit. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Packaging: C = 7 machine-ready reel. EIA-481 embossed plastic tape (1000 parts per full reel). 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 tape. Factory order only, not stocked (3500 parts per full reel). 2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent. 3. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value. 4. DC current applied to L1, at which the inductance drops the specified amount from its value without current. 5. Current applied to L1 that causes the specified temperature rise from 25C ambient. Refer to Doc 362 Soldering Surface Mount Components before soldering. Document 713-1 Revised 01/29/10 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 713-2 Coupled Inductors LPR4012 Series Core material Ferrite + D Weight 54 64 mg V C OUT AUX Terminations RoHS compliant silver-palladium-platinum-glass frit. L2 Other terminations available at additional cost. Ambient temperature 40C to +85C with Irms current, +85C to + + +125C with derated current L1 Storage temperature Component: 40C to +125C. SW V V Tape and reel packaging: 40C to +80C IN OUT D C Winding to winding isolation 100 V Resistance to soldering heat Max three 40 second reflows at +260C, parts cooled to room temperature between cycles Typical Buck Converter with auxiliary output Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30C / 85% relative humidity) Mean Time Between Failures (MTBF) 26,315,789 hours Failures in Time (FIT) 38 per one billion hours + + D Packaging 1000/7 reel 3500/13 reel Plastic tape: 12 mm wide, 0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth C L1 V L2 OUT Recommended pick and place nozzle OD: 4 mm ID: 2 mm PCB washing Only pure water or alcohol recommended V IN C PWM Current Derating Typical Flyback Converter 120 110 100 Dot indicates pin 1 90 80 14 1 4 70 0.155 0.003 L1 L2 3,94 0,076 60 XXXX 23 2 3 50 40 Dash 30 number 20 Isat 0.0433 0.004 10 Irms 1,10 0,10 0 Recommended 0.155 0.003 -40 -20 020406080 100 120 140 LandPattern 3,94 0,076 Ambient temperature (C) 1 4 45 typ 0.031 0,78 0.103 0.049 0.174 2,606 1,24 4,40 2 3 0.049 0.060 1,24 1,52 0.103 2,606 inches 0.174 Dimensions are in mm 4,40 Document 713-2 Revised 01/29/10 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. Percent of rated current 25C