Web
page
Sample
& buy
Tools &
software
Support
& FAQ
Document 752R-1
For Step-Up, Resonant
LPR6235 & Flyback Applications
Coupled Inductors
–
Halogen
Free
• Miniature shielded coupled inductors used as step-up or fly-
back 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
• 300 Vrms, one minute isolation (hipot) between windings
• 3.5 mm high and 6 mm square
• Excellent coupling coefficient (k = 0.95); ideal for use in a va-
riety of applications such as flyback transformers and step-up
pulse transformers.
• High Isat and low DCR ratings provide high efficiency and
excellent current handling in a rugged, low cost design
• Custom inductance values and turn ratios are available
upon request
DCR max
(Ohms)
C
Primary (L1)
SRF
D
Part
Turns inductance2
typ3 Isat4
V
V
OUT
IN
number1
ratio ±±20 (µH) L1
L±
(kHz) (A)
D
Sync
Rectifier
LPR6235-253LMR_ 1: 10
LPR6235-253PMR_ 1: 20
LPR6235-123QMR_ 1: 50
LPR6235-752RMR_ 1: 90
LPR6235-752SMR_ 1: 100
25
25
12.5
7.5
7.5
0.74
0.20
13.7 1300 1.3
72
L1
L2
C
580 0.7
360 0.9
257 1.6
230 1.6
C
0.085 200
0.085 285
0.085 340
1. When ordering, please specify packaging code:
LPR6±35-±53PMRC
Packaging: C = 7″ machine-ready reel. EIA-481 embossed plastic tape
(350 parts per full reel). Quantities less than full reel
available: in tape (not machine ready) or with leader and
trailer ($25 charge).
Typical Step-Up Converter
B = In an effort to simplify our part numbering system,
Coilcraft is eliminating the need for multiple packaging
codes. When ordering, simply change the last letter of
your part number from B to C.
+
+
D
C
V
L1
L2
OUT
D = 13″ machine-ready reel. EIA-481 embossed plastic tape.
Factory order only, not stocked (1500 parts per full reel).
V
IN
C
2. Inductance is measured at 100 kHz, 0.1 Vrms, 0 Adc for -253LMR. All other
values are measured at 10 kHz, 0.1 Vrms, 0 Adc on an Agilent/HP 4284A
LCR meter or equivalent.
–
PWM
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.
Typical Flyback Converter
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Document 752R-1 Revised 12/13/21
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2022
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.