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LTC3109

3109f

applicaTions inForMaTion

TEG LOAD MATCHING

The LTC3109 was designed to present an input resistance

(load) in the range of 2Ω to 10Ω, depending on input volt-

age,transformerturnsratioandtheC1AandC2Acapacitor

values (as shown in the Typical Performance curves). For

a given turns ratio, as the input voltage drops, the input

resistance increases. This feature allows the LTC3109 to

optimize power transfer from sources with a few Ohms

of source resistance, such as a typical TEG. Note that a

lower source resistance will always provide more output

current capability by providing a higher input voltage

under load.

UNIPOLAR APPLICATIONS

The LTC3109 can also be configured to operate from two

independent unipolar voltage sources, such as two TEGs

in different locations. In this configuration, energy can be

harvestedfromeitherorbothsourcessimultaneously.See

the Typical Applications for an example.

The LTC3109 can also be configured to operate from a

single unipolar source, using a single step-up transformer,

by ganging its VIN and SW pins together. In this manner,

it can extract the most energy from very low resistance

sources. See Figure 3 for an example of this configuration,

along with the performance curves.

PELTIER CELL (TEG) SUPPLIERS

Peltiercellsareavailableinawiderangeofsizesandpower

capabilities, from less than 10mm square to over 50mm

square. They are typically 2mm to 5mm in height. A list

of some Peltier cell manufacturers is given in Table 3 and

some recommended part numbers in Table 4.

COMPONENT SELECTION

Step-Up Transformer

The turns ratio of the step-up transformers will determine

how low the input voltage can be for the converter to start.

Due to the auto-polarity architecture, two identical step-up

transformersshouldbeused,unlessthetemperaturedrop

across the TEG is significantly different in one polarity, in

which case the ratios may be different.

Table 3. Peltier Cell Manufacturers

CUI Inc

www.cui.com

Ferrotec

www.ferrotec.com/products/thermal/modules/

Fujitaka

www.fujitaka.com/pub/peltier/english/thermoelectric_power.html

Hi-Z Technology

www.hi-z.com

Kryotherm

www.kryotherm

Laird Technologies

www.lairdtech.com

Micropelt

www.micropelt.com

Nextreme

www.nextreme.com

TE Technology

www.tetech.com/Peltier-Thermoelectric-Cooler-Modules.html

Tellurex

www.tellurex.com/

Table 4. Recommended TEG Part Numbers by Size

MANUFACTURER

15mm

20mm

30mm

40mm

CUI Inc. (Distributor)

CP60133

CP60233

CP60333

CP85438

Ferrotec

9501/031/030 B

9501/071/040 B

9500/097/090 B

9500/127/100 B

Fujitaka

FPH13106NC

FPH17106NC

FPH17108AC

FPH112708AC

Kryotherm

TGM-127-1.0-0.8

LCB-127-1.4-1.15

Laird Technology

PT6.7.F2.3030.W6

PT8.12.F2.4040.TA.W6

Marlow Industries

RC3-8-01

RC6-6-01

RC12-8-01LS

Tellurex

C2-15-0405

C2-20-0409

C2-30-1505

C2-40-1509

TE Technology

TE-31-1.0-1.3

TE-31-1.4-1.15

TE-71-1.4-1.15

TE-127-1.4-1.05

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