LTC3108EDE-1#PBF Linear Technology, LTC3108EDE-1#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC3108EDE-1#PBF
• Description: IC VOLTAGE CONVERTER 12-DFN
• Manufacturer: Linear Technology

Specifications of LTC3108EDE-1#PBF

• Applications: Energy Harvesting
• Current - Supply: 3mA
• Voltage - Supply: 20mV ~ 500mV
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 12-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

applicaTions inForMaTion
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
Table 4. Recommended TEG Part Numbers by Size
MANUFACTURER
CUI Inc. (Distributor)
Ferrotec
Fujitaka
Kryotherm
Laird Technology
Marlow Industries
Tellurex
TE Technology
CP60133
9501/031/030 B
FPH13106NC
C2-15-0405
TE-31-1.0-1.3
15mm × 15mm
CP60233
9501/071/040 B
FPH17106NC
RC3-8-01
C2-20-0409
TE-31-1.4-1.15
20mm × 20mm
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
CP60333
9500/097/090 B
FPH17108AC
TGM-127-1.0-0.8
PT6.7.F2.3030.W6
RC6-6-01
C2-30-1505
TE-71-1.4-1.15
30mm × 30mm
CP85438
9500/127/100 B
FPH112708AC
LCB-127-1.4-1.15
PT8.12.F2.4040.TA.W6
RC12-8-01LS
C2-40-1509
TE-127-1.4-1.05
LTC3108-1
40mm × 40mm

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