Document 752-1 Coupled Inductors – LPR6235 For Step-Up, Resonant & 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 rugged, low cost design. Custom inductance values and turn ratios may be available upon request. Primary (L1) DCR max SRF (Ohms) inductance2 typ3 Isat4 Part Turns number1 ratio ±20% (µH) L1 L2 (kHz)(A) LPR6235-253LML_1 : 10 LPR6235-253PML_1 : 20 LPR6235-123QML_1 : 50 LPR6235-752RML_1 : 90 LPR6235-752SML_1 : 100 25 25 12.5 7.5 7.5 C D VIN D 0.74 13.713001.3 0.20 72 5800.7 0.085200 360 0.9 0.085275 257 1.6 0.085316 230 1.6 C L1 VOUT Sync Rectifier L2 C 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). 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 (1500 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. 4. DC current applied to L1, at which the inductance drops 10% from its value without current. 5. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Typical Step-Up Converter + + D L1 VIN L2 C C VOUT – PWM – Typical Flyback Converter US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 752-1 Revised 09/24/13 © Coilcraft Inc. 2013 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. Document 752-2 Step-Up / Flyback Transformers – LPR6235 Dot indicates pin 1 1 0.236 ±0.003 6,00 ±0,08 XXXX 4 L1 L2 3 2 Dash number 0.138 max 3,50 0.236 ±0.003 6,00 ±0,08 Recommended Land Pattern 1 3 2 0.167 0.079 4,25 2,00 4 1 inches mm 45° typ 0.260 6,60 3 2 0.060 1,52 Dimensions are in 4 0.047 1,2 Core material Ferrite Weight 460 – 480 mg Terminations RoHS compliant silver-palladium-platinum-glass frit. Other terminations available at additional cost. Ambient temperature –40°C to +85°C with Irms current, +85°C to +125°C with derated current Storage temperature Component: –40°C to +125°C. Tape and reel packaging: –40°C to +80°C Winding to winding isolation 300 Vrms Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Mean Time Between Failures (MTBF) 26,315,789 hours Failures in Time (FIT) 38 per one billion hours Packaging 350/7″ reel; 1500/13″ reel Plastic tape: 16 mm wide, 0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth Recommended pick and place nozzle OD: 6.2 mm; ID: ≤ 3.1 mm PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. 0.079 2,00 0.167 4,25 0.260 6,60 US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 752-2 Revised 09/24/13 © Coilcraft Inc. 2013 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information.