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© 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 752-1

CoupledInductors–LPR6235

Document 752-1 Revised 09/24/13

• 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

(Ohms)

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

0.085 275

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.

ForStep-Up,Resonant

&FlybackApplications

L1

L1

L2

L2

++

–

–

D

D

D

C

C

C

C

PWM

C

Typical Step-Up Converter

Typical Flyback Converter

Sync

Rectifier