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LTC3108-1

31081fa

this manner, a Peltier cell is referred to as a thermoelectric

generator (TEG).

The low voltage capability of the LTC3108-1 design allows

it to operate from a TEG with temperature differentials

as low as 1°C, making it ideal for harvesting energy in

applications in which a temperature difference exists

between two surfaces or between a surface and the am-

bient temperature. The internal resistance (ESR) of most

cells is in the range of 1Ω to 5Ω, allowing for reasonable

power transfer. The curves in Figure 2 show the open-

circuit output voltage and maximum power transfer for a

typical Peltier cell (with an ESR of 2Ω) over a 20°C range

of temperature differential.

TEG Load Matching

The LTC3108-1 was designed to present a minimum input

resistance (load) in the range of 2Ω to 10Ω, depending

on input voltage and transformer turns ratio (as shown

in the Typical Performance Characteristics curves). For

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

resistance increases. This feature allows the LTC3108-1

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.

Peltier Cell (TEG) Suppliers

Peltier cells are available in a wide range of sizes and

power capabilities, from less than 10mm square to over

50mm square. They are typically 2mm to 5mm in height.

A list of Peltier cell manufacturers is given in Table 3.

Table 3. Peltier Cell Manufacturers

Fujitaka

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

FerroTec

www.ferrotec.com/products/thermal/modules

Laird Technologies

www.lairdtech.com

Marlow Industries

www.marlow.com

Micropelt

www.micropelt.com

Nextreme

www.nextreme.com

TE Technology

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

Tellurex

www.tellurex.com

Kryotherm

www.kryothermusa.com

APPLICATIONS INFORMATION

Table 4. Recommended TEG Part Numbers by Size

MANUFACTURER

15mm × 15mm

20mm × 20mm

30mm × 30mm

40mm × 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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