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PDF LTC3107 Data sheet ( Hoja de datos )
| Número de pieza | LTC3107 | |
| Descripción | Ultra-Low Voltage Energy Harvester and Primary Battery Life Extender | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
LTC3107
Ultra-Low Voltage
Energy Harvester and
Primary Battery Life Extender
Description
n Thermal Energy Harvesting Assisted Power
Management System
n VOUT Tracks the Primary Battery Voltage
n 2.2V LDO Output
n Reserve Energy Output, Clamped to 4.3V
n Operates from Inputs as Low as 20mV
n Battery In-Use Indicator (BAT_OFF)
n IQ from Battery:
n 80nA When Energy Harvesting
n 6µA No Energy Harvesting
n Standard, Compact Step-Up Transformer
n Small, Thermally Enhanced 10-lead (3mm × 3mm)
DFN package
Applications
n Industrial Wireless Sensing
n Remote Sensor and Radio power
n HVAC
n Automatic Metering
n Building Automation, Security
n Predictive Maintenance, Condition Monitoring
The LTC®3107 is a highly integrated DC/DC converter de-
signed to extend the life of a primary battery in low power
wireless systems by harvesting and managing surplus en-
ergyfromextremely lowinputvoltage sources suchasTEGs
(Thermoelectric Generators) and thermopiles. The step-up
topology operates from input voltages as low as 20mV.
Using a small step-up transformer, the LTC3107
provides a complete power management solution for
typical wireless sensor applications that operate from a
primary battery. The 2.2V LDO can be used to power an
external microprocessor, while the main output voltage
automatically adapts to match the voltage of the primary
battery. The LTC3107 seamlessly transitions from battery
power to harvested power whenever harvested energy is
available, extending the life of the battery. The BAT_OFF
indicator can be used to track battery usage. An optional
storage capacitor accumulates excess harvested energy,
further extending battery life.
The LTC3107 is available in a small, thermally enhanced
10-lead (3mm × 3mm) DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
TEG Powered Thermal Harvester with Primary Cell Life Extender
THERMOELECTRIC
GENERATOR
T1 1nF
VIN 1:100
C1
VBAT
330pF
LTC3107
10µF
3.6V
C2 BAT_OFF
SW VOUT
GND
VLDO
VLDO
VAUX
VSTORE
2.2µF
+
10µF
CSTORE
(OPTIONAL)
3.6V
+
VOUT
COUT
3107 TA01a
For more information www.linear.com/LTC3107
Percentage of Added Battery Life
vs TEG Surface Temperature
100000 TA = 23°C
10000
1000
100
10
1
25
CUI CP20151 TEG
24×24×22mm HEATSINK
NATURAL CONVECTION
0.5Hz XMT RATE (227µW AVG)
1Hz XMT RATE (437µW AVG)
2Hz XMT RATE (679µW AVG)
30 35 40 45
SURFACE TEMPERATURE (°C)
50
3107 TA01
3107f
1
1 page  
LTC3107
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
VAUX Voltage
vs Clamp Current
1.80
1.50
1.20
0.90
0.60
0.30
0.00
0.01
0.1 1
ICLAMP (mA)
10
3107 G11
IVOUT Current Limit vs VOUT
80
70
60
50
40
30
20
10
0
2.0
VOUT = VBAT –0.4V
VOUT = 0V, HARVESTING
VOUT = 0V, VAUX = 0V, NOT HARVESTING
2.5 3.0 3.5 4.0
VBAT (V)
3107 G12
LDO Step Load Response
(10µA to 10mA)
VBAT = 3.6V
CLDO = 2.2µF
100mV/DIV
20mA/DIV
VLDO
ILDO
5ms/DIV
3107 G13
NPuolsHeadrvVeOsUtiTnLgoad,
VBAT = 3.6V
200mV/DIV
VBAT
VOUT
20µA LOAD WITH A
20mA, 10ms LONG
PULSE EVERY SECOND
2V/DIV
BAT_OFF
200ms/DIV
3107 G14
Pulsed VOUT Load, Harvesting
(Not Using Battery)
VBAT = 3.6V
200mV/DIV
VBAT
VOUT
20µA LOAD WITH A
20mA, 10ms LONG
PULSE EVERY SECOND
2V/DIV
BAT_OFF
200ms/DIV
3107 G15
Pulsed VOUT Load, Harvesting
HInasruvfefisctieedntECnOeUrgTyor Insufficient
VBAT = 3.6V
200mV/DIV
VBAT
VOUT
20µA LOAD WITH A
20mA, 50ms LONG
PULSE EVERY SECOND
2V/DIV
BAT_OFF
200ms/DIV
3107 G16
Voltage Sequencing When
Battery Is Connected
VBAT
2V/DIV
VOUT
VAUX
VLDO
5ms/DIV
3107 G19
For more information www.linear.com/LTC3107
3107f
5
5 Page 
LTC3107
Operation
VOUT capacitor to reduce VOUT ripple during load steps. The
LTC3107 will automatically use energy from the VSTORE
capacitor to maintain VOUT in regulation before drawing
any current from the battery. Note that it may take a long
time to charge a large VSTORE capacitor, depending on
the harvested energy available and the loading on VOUT
and VLDO.
If a storage capacitor is not being used, the VSTORE pin
can be left open or tied to VAUX.
Short Circuit Protection
All outputs of the LTC3107 are current limited to protect
against short circuits.
Output Voltage Sequencing
A diagram showing the typical output voltage profiles dur-
ing start-up with an energy harvesting source is shown
in Figure 1.
Operation with Battery Removed
Although the LTC3107 is designed to have a primary battery
connected to VBAT, there may be times when the battery is
removed for a short duration (such as for maintenance).
If there is sufficient harvested energy (or stored energy)
available to maintain VOUT and VLDO, then the current draw
on VBAT will be only 80nA, plus any leakage from the VBAT
decoupling capacitor, which should be very small (typically
less than 1µA). In this case, if the battery is removed, the
capacitor on VBAT will hold-up the VBAT voltage, allowing
VOUT to maintain regulation. As the VBAT voltage slowly
decays due to leakage, VOUT will follow it. For example, if
the VBAT decoupling capacitor is 20µF nominal, and the
total leakage on VBAT is 0.1µA, then VBAT and VOUT will
decay at a rate of 5mV per second.
If there is no harvested or stored energy available to power
VOUT and VLDO, then these voltages will drop when the
battery is removed. In this case, their rate of decay will be
determined solely by the amount of capacitance on VOUT
(since it is generally much larger than the VLDO capaci-
tor) and the combined load current on VOUT and VLDO.
For more information www.linear.com/LTC3107
3107f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3107.PDF ] | |
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