LTC3588-2_10 Datasheet, PDF (13/18 Pages) Linear Technology – Piezoelectric Energy Harvesting Power Supply with 14V Minimum VIN

Applications Information
ADVANCED CERAMETRICS
PFCB-W14
LTC3588-2
PZ1
PZ2
PGOOD1 PGOOD
V_IN
22µH
LTC3588-2
5.0V
SW
CAP
10µF
6V
V_OUT
V_IN2
D1
GND
D0
1µF
6V
10µF
25V
4.7µF
6V
1µF
6V
10µF
25V
4.7µF
6V
PZ1
PZ2
V_IN
PGOOD
LTC3588-2
CAP
SW
V_IN2
V_OUT
D1
D0
GND
PGOOD2
22µH
3.45V
10µF
6V
35882 F06
Figure 6. Dual Rail Power Supply with Single Piezo
DANGER! HIGH VOLTAGE!
150k 150k
120VAC
60Hz _{150k 150k}
1µF
6V
10µF
25V
4.7µF
6V
PZ1
PZ2
V_IN
PGOOD
LTC3588-2
CAP
SW
V_IN2
V_OUT
D0
D1
GND
PGOOD
22µH
V_OUT
4.1V
22µF
6V
35882 F07
Li-Ion
POWER
STREAM
LiR2450
120mAh
DANGEROUS AND LETHAL POTENTIALS ARE PRESENT IN OFFLINE CIRCUITS!
BEFORE PROCEEDING ANY FURTHER, THE READER IS WARNED THAT
CAUTION MUST BE USED IN THE CONSTRUCTION, TESTING AND USE OF
OFFLINE CIRCUITS. EXTREME CAUTION MUST BE USED IN WORKING WITH
AND MAKING CONNECTIONS TO THESE CIRCUITS. REPEAT: OFFLINE
CIRCUITS CONTAIN DANGEROUS, AC LINE-CONNECTED HIGH VOLTAGE
POTENTIALS. USE CAUTION. ALL TESTING PERFORMED ON AN OFFLINE
CIRCUIT MUST BE DONE WITH AN ISOLATION TRANSFORMER CONNECTED
BETWEEN THE OFFLINE CIRCUIT’S INPUT AND THE AC LINE. USERS AND
CONSTRUCTORS OF OFFLINE CIRCUITS MUST OBSERVE THIS PRECAUTION
WHEN CONNECTING TEST EQUIPMENT TO THE CIRCUIT TO AVOID ELECTRIC
SHOCK. REPEAT: AN ISOLATION TRANSFORMER MUST BE CONNECTED
BETWEEN THE CIRCUIT INPUT AND THE AC LINE IF ANY TEST EQUIPMENT IS
TO BE CONNECTED.
Figure 7. AC Line Powered 4.1V Li-Ion Battery Charger
Alternate Power Sources
The LTC3588-2 is not limited to use with piezoelectric ele-
ments but can accommodate a wide variety of input sources
depending on the type of ambient energy available. Figure 7
shows the LTC3588-2 internal bridge rectifier connected
to the AC line in series with four 150k current limiting
resistors. This is a high voltage application and minimum
spacing between the line, neutral, and any high voltage
components should be maintained per the applicable UL
specification. For general off-line applications refer to UL
regulation 1012.
Figure 8 shows an application where copper panels are
placed near a standard fluorescent room light to capacitively
harvest energy from the electric field around the light.
COPPER PANEL
(12" × 24")
PANELS ARE PLACED 6"
FROM 2' × 4' FLUORESCENT
LIGHT FIXTURES
COPPER PANEL
(12" × 24")
10µF
25V
1µF
6V
4.7µF
6V
PZ1
PZ2
V_IN
PGOOD
LTC3588-2
CAP
SW
V_IN2
V_OUT
D1
D0
GND
PGOOD
22µH
4.5V
10µF
6V
35882 F08
Figure 8. Electric Field Energy Harvester
35882fa
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