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PDF LTC3108-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3108-1 | |
| Descripción | Ultralow Voltage Step-Up Converter and Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3108-1www.DataSheet4U.com
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 2.5V, 3V, 3.7V or 4.5V
- 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®3108-1 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.
Using a small step-up transformer, the LTC3108-1 provides
a complete power management solution for wireless sens-
ing 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 LTC3108-1 is functionally equivalent to the
LTC3108 except for its unique fixed VOUT options.
The LTC3108-1 is available in a small, thermally enhanced
12-lead (3mm × 4mm) DFN package and a 16-lead SSOP
package.
Typical Application
THERMOELECTRIC
GENERATOR
++
20mV TO 500mV
Wireless Remote Sensor Application
Powered From a Peltier Cell
1:100
1nF
C1
VSTORE
5.25V
+
220µF
330pF
LTC3108-1
C2
SW
VOUT2
PGD
VLDO
PGOOD
2.2V
VS2 VOUT 3V +
0.1F
6.3V
µP
2.2µF SENSORS
470µF RF LINK
VS1 VOUT2_EN
VAUX GND
31081 TA01a
1µF
VOUT Charge Time
1000 VOUT = 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)
31081 TA01b
31081f
1 page  
LTC3108-1www.DataSheet4U.com
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
I1V:O5U0TRvastiVoIN and Source Resistance,
10000 C1 = 4.7nF
I1V: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)
31081 G06
IVOUT vs dT and TEG Size,
1:100 Ratio
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
31081 G08
1Ω
2Ω
5Ω
10Ω
10
0 100 200 300 400 500
VIN OPEN-CIRCUIT (mV)
31081 G07
Resonant Switching Waveforms
VIN = 20mV
1:100 RATIO TRANSFORMER
C1 PIN
2V/DIV
C2 PIN
2V/DIV
SW PIN
50mV/
DIV
10µs/DIV
31081 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)
31081 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)
31081 G11
31081f
5 Page 
Operation
LTC3108-1www.DataSheet4U.com
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)
31081 F01a
Figure 1. Output Voltage Sequencing with VOUT Programmed for 3V (Time Not to Scale)
31081f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3108-1.PDF ] | |
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