US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
Document 752-1
Coupled Inductors
–
LPR6235
Document 752-1 Revised 10/22/13
• 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
Primary (L1) DCR max SRF
Part Turns
inductance2 (Ohms) typ3 Isat4
number1 ratio ±20% (µH) L1 L2 (kHz) (A)
LPR6235-253LML_ 1 : 10 25 0.74 13.7 1300 1.3
LPR6235-253PML_ 1 : 20 25 0.20 72 580 0.7
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).
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.
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.
For Step-Up, Resonant
& Flyback Applications
L1
L1
L2
L2
++
–
–
D
D
D
C
C
C
C
PWM
C
Typical Step-Up Converter
Typical Flyback Converter
VOUT
V
OUT
V
IN
V
IN
Sync
Rectifier
US
UK
Taiwan
China
Singapore
+1-847-639-6400 sales@coilcraft.com
+44-1236-730595 sales@coilcraft-europe.com
+886-2-2264 3646 sales@coilcraft.com.tw
+86-21-6218 8074 sales@coilcraft.com.cn
+ 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
Step-Up / Flyback Transformers
–
LPR6235
Document 752-2
Dimensions are in inches
mm
0.236 ±0.003
6,00 ±0,08
0.236 ±0.003
6,00 ±0,08
0.138
3,50 max
Dash
number
XXXX
Recommended
Land Pattern
0.060
1,52
0.260
6,60
0.167
4,25
0.167
4,25
0.079
2,00
0.079
2,00
0.260
6,60
0.047
1,2
45°
typ
1
1
4
42
2
3
3
2
14
3
L1
L2
Dot indicates pin 1
Document 752-2 Revised 10/22/13
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.
