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PDF LTC3108 Data sheet ( Hoja de datos )
| Número de pieza | LTC3108 | |
| Descripción | Ultralow Voltage Step-Up Converter and Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3108
Ultralow Voltage Step-Up
Converter and Power Manager
Features
n Operates from Inputs of 20mV
n Complete Energy Harvesting Power
Management System
- Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
- LDO: 2.2V at 3mA
- Logic Controlled Output
- Reserve Energy Output
n Power Good Indicator
n Uses Compact Step-Up Transformers
n Small 12-Lead (3mm × 4mm) DFN or 16-Lead
SSOP Packages
Applications
n Remote Sensors and Radio Power
n Surplus Heat Energy Harvesting
n HVAC Systems
n Industrial Wireless Sensing
n Automatic Metering
n Building Automation
n Predictive Maintenance
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Description
The LTC®3108 is a highly integrated DC/DC converter ideal
for harvesting and managing surplus energy from extremely
low input voltage sources such as TEGs (thermoelectric
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 VOUT 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 programmed to
one of four fixed voltages to power a wireless 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.
Typical Application
Wireless Remote Sensor Application Powered From a Peltier Cell
THERMOELECTRIC
GENERATOR
++
1:100
220µF
20mV TO 500mV
1nF
330pF
C1
VSTORE
5V
+
LTC3108
C2
SW
VOUT2
PGD
VLDO
PGOOD
2.2V
VS2
VOUT
3.3V
+
0.1F
6.3V
µP
2.2µF SENSORS
470µF RF LINK
VS1 VOUT2_EN
VAUX GND
3108 TA01a
1µF
For more information www.linear.com/LTC3108
VOUT Charge Time
1000 VOUT = 3.3V
COUT = 470µF
100
10
1
1:100 Ratio
1:50 Ratio
1:20 Ratio
0
0 50 100 150 200 250 300 350 400
VIN (mV)
3108 TA01b
3108fc
1
1 page  
LTC3108
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
1IV:O5U0TRvastiVoIN and Source Resistance,
10000 C1 = 4.7nF
1IV:O1U0T0vRsaVtiIoN and Source Resistance,
1000 C1 = 1nF
1000
100 100
10 1Ω
2Ω
5Ω
10Ω
0
0 100 200 300 400 500 600 700 800
VIN OPEN-CIRCUIT (mV)
3108 G06
I1V:O1U0T0
vs dT and
Ratio
TEG
Size,
10000 VOUT = 0V
1000
40mm
TEG
15mm
TEG
100
10
0
0.1
1:50 RATIO
1:100 RATIO
1:50 RATIO
1:100 RATIO
1 10
dT ACROSS TEG (°C)
100
3108 G08
1Ω
2Ω
5Ω
10Ω
10
0 100 200 300 400 500
VIN OPEN-CIRCUIT (mV)
3108 G07
Resonant Switching Waveforms
VIN = 20mV
1:100 RATIO TRANSFORMER
C1 PIN
2V/DIV
C2 PIN
2V/DIV
SW PIN
50mV/
DIV
10µs/DIV
3108 G09
LDO Load Regulation
0.00
–0.25
–0.50
–0.75
–1.00
0 0.5 1 1.5 2 2.5 3 3.5 4
LDO LOAD (mA)
3108 G10
LDO Dropout Voltage
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
0 0.5 1 1.5 2 2.5 3 3.5 4
LDO LOAD (mA)
3108 G11
For more information www.linear.com/LTC3108
3108fc
5
5 Page 
Operation
LTC3108
5.0
2.5
0
3.0
2.0
1.0
0
5.0
2.5
0
3.0
2.0
1.0
0
5.0
2.5
0
0
VSTORE (V)
PGD (V)
VOUT (V)
VLDO (V)
VAUX (V)
10 20 30 40 50 60 70 80
TIME (ms)
3108 F01a
Figure 1. Output Voltage Sequencing with VOUT Programmed for 3.3V (Time Not to Scale)
For more information www.linear.com/LTC3108
3108fc
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11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTC3108.PDF ] | |
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