Document 661-1 Coupled Inductors – LPD3015 For SEPIC and other Applications At only 1.4 mm high and 3 mm square, the LPD3015 is Coilcraft’s smallest shielded coupled inductor. It is ideal for use in a variety of circuits including flyback, multi-output buck and SEPIC. These inductors provide high inductance, high efficiency and excellent current handling in a rugged, low cost part. They can also be used as two single inductors connected in series or parallel or as a common mode choke. + + D L1 VIN C L2 C VOUT – SW – Typical Flyback Converter L2 D + C VOUT AUX – 0.118 ±0.003 3,00 ±0,076 + Dot indicates pin 1 1 + VIN 4 SW L1 D C – Dash number 3 L1 VIN 0.055 ±0.004 * 1,4 ±0,1 – 1 4 0.022 0,54 0.094 0.040 2,30 1,02 *Height dimension is without optional solder applied. Maximum height with solder applied is 0.061 inches / 1,56 mm. 0.040 1,02 0.094 2,30 0.130 3,30 4 Dimensions are in 2 L2 3 45° typ 0.130 3,30 3 2 0.039 0,99 L1 D + Internal code 1 – Typical Buck Converter with auxiliary output 0.118 ±0.003 3,00 ±0,076 XXX X 2 VOUT inches mm + C1 L2 Q C Typical SEPIC schematic VOUT – Core material Ferrite Weight 45 – 52 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 100 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) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging 1000/7″reel; 3500/13″ reel Plastic tape: 12 mm wide, 0.26 mm thick, 8 mm pocket spacing, 1.65 mm pocket depth Recommended pick and place nozzle OD: 3 mm; ID: ≤ 1.5 mm PCB washing Only pure water or alcohol recommended Specifications subject to change without notice. Please check our website for latest information. Document 661-1 Revised 09/13/11 Document 661-1 Revised 03/31/11 Document 661-2 Coupled Inductors for SEPIC - LPD3015 Series Isat (A)6 Irms (A) CouplingLeakage 2 3 4 5 Inductance DCR max SRF typ coefficient L typ 10% 20% 30% both one Part number1 ±20% (µH) (Ohms) (MHz) typ (µH) drop drop drop windings7 winding8 LPD3015-391ML_ LPD3015-561ML_ LPD3015-102ML_ LPD3015-152ML_ LPD3015-182ML_ 0.390.071289 0.560.079235 1.0 0.129160 1.5 0.204140 1.8 0.273135 0.89 0.93 0.95 0.96 0.96 0.083.23.33.4 0.082.72.82.8 0.09 2.0 2.12.2 0.11 1.6 1.71.8 0.13 1.5 1.61.6 1.45 2.05 1.37 1.94 1.08 1.52 0.86 1.20 0.78 1.10 LPD3015-222ML_ 2.2 0.300110 LPD3015-332ML_ 3.3 0.337 90 LPD3015-472ML_ 4.70.503 79 LPD3015-682ML_ 6.80.622 58 LPD3015-103ML_10 1.040 48 0.97 0.14 1.5 1.61.6 0.75 1.05 0.98 0.16 1.0 1.11.2 0.67 0.94 0.980.18 0.86 0.87 0.880.54 0.76 0.980.22 0.77 0.78 0.790.49 0.69 0.990.28 0.58 0.59 0.600.38 0.53 LPD3015-153ML_15 LPD3015-183ML_18 LPD3015-223ML_22 LPD3015-333ML_33 LPD3015-473ML_47 0.990.37 0.49 0.50 0.510.32 0.46 0.990.42 0.46 0.47 0.480.31 0.44 0.990.48 0.42 0.43 0.440.28 0.40 0.990.63 0.34 0.35 0.360.23 0.32 0.990.81 0.28 0.29 0.300.19 0.27 1.420 35 1.550 33 1.8930 2.8423 4.0317 LPD3015-683ML_68 6.1114 0.991.13 0.24 0.25 0.260.16 0.22 LPD3015-104ML_ 100 8.5411 0.991.50 0.20 0.21 0.220.13 0.19 LPD3015-124ML_ 120 9.23 9.00.991.76 0.19 0.20 0.200.13 0.18 LPD3015-154ML_ 15012.40 8.00.992.22 0.16 0.17 0.180.11 0.16 LPD3015-184ML_ 18015.32 7.50.992.79 0.15 0.16 0.170.10 0.14 LPD3015-224ML_ 22018.56 6.00.993.56 0.13 0.14 0.150.09 0.13 LPD3015-334ML_ 33027.70 5.00.995.18 0.11 0.12 0.120.07 0.10 1. Please specify termination and packaging codes: Temperature rise calculation based on specified Irms LPD3015-334MLC 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 shown for each winding, measured at 100 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A LCR meter or equivalent. When leads are connected in parallel, inductance is the same value. When leads are connected in series, inductance is four times the value. 3. DCR is for each winding. When leads are connected in parallel, DCR is half the value. When leads are connected in series, DCR is twice the value. 4. SRF measured using an Agilent/HP 4191A or equivalent. When leads are connected in parallel, SRF is the same value. 5. Leakage Inductance is for L1 and is measured with L2 shorted. 6. DC current, at which the inductance drops the specified amount from its value without current. It is the sum of the current flowing in both windings. 7. Equal current when applied to each winding simultaneously that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. 8 Maximum current when applied to one winding that causes a 40°C temperature rise from 25°C ambient. See temperature rise calculation. 9. Electrical specifications at 25°C. Refer to Doc 639 “Selecting Coupled Inductors for SEPIC Applications.” Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Winding power loss = (IL12 + IL22 ) × DCR in Watts (W) 135°C Temperature rise = Winding power loss × W Examples for LPD3015-152ML: Equal current in each winding (0.86 A): Winding power loss = (0.86 2 + 0.86 2) × 0.204 = 0.301 W Temperature rise = 0.301 W × 135°C = 40.6°C W Unequal current (IL1 = 1.0 A, IL2 = 0.6 A): Winding power loss = (1.0 2 + 0.6 2) × 0.204 = 0.277 W 135°C = 37.5°C Temperature rise = 0.277 W × W Coupled Inductor Core and Winding Loss Calculator This web-based utility allows you to enter frequency, peak-to-peak (ripple) current, and Irms current to predict temperature rise and overall losses, including core loss. Visit www.coilcraft.com/coupledloss. Specifications subject to change without notice. Please check our website for latest information. Document 661-2 Revised 09/13/11 Document 661-3 Coupled Inductors for SEPIC - LPD3015 Series Typical L vs Current Typical L vs Frequency 1000 1000 330 µH 330 µH 220 µH 220 µH 100 100 µH Inductance (µH) Inductance (µH) 100 33 µH 22 µH 10 10 µH 3.3 µH 2.2 µH 1 100 µH 33 µH 22 µH 10 10 µH 3.3 µH 2.2 µH 1 1.0 µH 1.0 µH 0.1 0.1 0.01 0.1 Current (A) 1 10 0.01 0.1 1 Frequency (MHz) 10 Typical Current Derating 100 90 80 70 60 50 40 30 20 10 0 25°C Percent of rated current 120 110 Isat Irms -40 -20 0 20 40 60 80 100 120 140 Ambient temperature (°C) Specifications subject to change without notice. Please check our website for latest information. Document 661-3 Revised 09/13/11