ideal for harvesting and managing surplus energy from
extremely low input voltage sources such as TEGs (ther-
moelectric generators), thermopiles and small solar cells.
The step-up topology operates from input voltages as
low as 20mV. The LTC3108 is functionally equivalent to
the LTC3108-1 except for its unique fixed V
OUT
options.
Using a small step-up transformer, the LTC3108 provides
a complete power management solution for wireless
sensing and data acquisition. The 2.2V LDO powers an
external microprocessor, while the main output is pro-
grammed to one of four fixed voltages to power a wire-
less transmitter or sensors. The power good indicator
signals that the main output voltage is within regulation.
A second output can be enabled by the host. A storage
capacitor provides power when the input voltage source
is unavailable. Extremely low quiescent current and high
efficiency design ensure the fastest possible charge times
of the output reservoir capacitor.
The LTC3108 is available in a small, thermally enhanced
12-lead (3mm
×
4mm) DFN package and a 16-lead
SSOP package.
n
n
n
Operates from Inputs of 20mV
Complete Energy Harvesting Power
Management System
n
Selectable V
OUT
of 2.35V, 3.3V, 4.1V or 5V
n
LDO: 2.2V at 3mA
n
Logic Controlled Output
n
Reserve Energy Output
Power Good Indicator
Uses Compact Step-Up Transformers
Small 12-Lead (3mm
×
4mm) DFN or 16-Lead
SSOP Packages
APPLICATIONS
n
n
n
n
n
n
n
Remote Sensors and Radio Power
Surplus Heat Energy Harvesting
HVAC Systems
Industrial Wireless Sensing
Automatic Metering
Building Automation
Predictive Maintenance
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Wireless Remote Sensor Application Powered From a Peltier Cell
1:100
+
THERMOELECTRIC
GENERATOR
20mV TO 500mV
1nF
C1
330pF
C2
SW
VSTORE
LTC3108
V
OUT2
PGOOD
PGD
2.2V
VLDO
5V
1000
0.1F
6.3V
100
µP
TIME (sec)
2.2µF SENSORS
VS2
V
OUT
3.3V
10
V
OUT
Charge Time
V
OUT
= 3.3V
C
OUT
= 470µF
+
+
220µF
+
470µF
RF LINK
1
1:100 Ratio
1:50 Ratio
1:20 Ratio
0
50
100 150 200 250 300 350 400
V
IN
(mV)
3108 TA01b
VS1 V
OUT2_EN
VAUX
GND
1µF
3108 TA01a
0
Rev. D
Document Feedback
For more information
www.analog.com
1
LTC3108
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SW Voltage ..................................................–0.3V to 2V
C1 Voltage....................................................–0.3V to 6V
C2 Voltage (Note 5).........................................–8V to 8V
V
OUT2
, V
OUT2_EN
..........................................–0.3V to 6V
VAUX.................................................... 15mA into VAUX
VS1, VS2, VAUX, V
OUT
, PGD ........................–0.3V to 6V
VLDO, VSTORE ............................................–0.3V to 6V
Operating Junction Temperature Range
(Note 2)..................................................–40°C to 125°C
Storage Temperature Range ..................–65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VAUX
VSTORE
V
OUT
V
OUT2
VLDO
PGD
1
2
3
4
5
6
13
GND
12
SW
11
C2
10
C1
9
8
7
V
OUT2_EN
VS1
VS2
GND
VAUX
VSTORE
V
OUT
V
OUT2
VLDO
PGD
GND
1
2
3
4
5
6
7
8
TOP VIEW
16 GND
15 SW
14 C2
13 C1
12 V
OUT2_EN
11 VS1
10 VS2
9
GND
DE PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB (NOTE 4)
GN PACKAGE
16-LEAD PLASTIC SSOP NARROW
T
JMAX
= 125°C,
θ
JA
= 110°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC3108EDE#PBF
LTC3108IDE#PBF
LTC3108EGN#PBF
LTC3108IGN#PBF
TAPE AND REEL
LTC3108EDE#TRPBF
LTC3108IDE#TRPBF
LTC3108EGN#TRPBF
LTC3108IGN#TRPBF
PART MARKING*
3108
3108
3108
3108
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic SSOP
16-Lead Plastic SSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Start-Up Voltage
No-Load Input Current
Input Voltage Range
CONDITIONS
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for T
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