LTC3108 datasheet(18/22 Pages) LINER

18 / 22 page

LTC3108

3108fa

duration of the burst and T is the period of the transmit

burst rate (essentially the time between bursts).

In this example, IQ = 5µA, IBURST = 100mA, t = 5ms and

T = one hour. The average charge current required from

the LTC3108 would be:

µA

CHG ≥

100

0 005

3600

5 14

• .

sec

Therefore, if the LTC3108 has an input voltage that allows

it to supply a charge current greater than 5.14µA, the

application can support 100mA bursts lasting 5ms every

hour. It can be determined that the sleep current of 5µA

is the dominant factor because the transmit duty cycle is

so small (0.00014%). Note that for a VOUT of 3.3V, the

average power required by this application is only 17µW

(not including converter losses).

Note that the charge current available from the LTC3108

has no effect on the sizing of the VOUT capacitor (if it is

assumedthattheloadcurrentduringaburstismuchlarger

than the charge current), and the VOUT capacitor has no

effect on the maximum allowed burst rate.

applicaTions inForMaTion

Peltier-Powered Energy Harvester for Remote Sensor Applications

Typical applicaTions

3108 TA02

VS2

VS1

COOPER BUSSMAN PB-5ROH104-R

OR KR-5R5H104-R

VOUT2

PGOOD

2.2V

COUT*

PGD

VLDO

VSTORE

VOUT

VOUT2_EN

LTC3108

VAUX

GND

CSTORE

0.1F

6.3V

3.3V

1µF

1nF

CIN

1:100

T1: COILCRAFT LPR6235-752SML

*COUT VALUE DEPENDENT ON

THE MAGNITUDE AND DURATION

OF THE LOAD PULSE

330pF

∆T = 1°C TO 20°C

SENSORS

XMTR

µP

2.2µF

OFF

3.3V

THERMOELECTRIC

GENERATOR

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