LT1673 LINER [Linear Technology], LT1673 Datasheet

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LT1673

Manufacturer Part Number
LT1673
Description
Auto-Polarity, Ultralow Voltage Step-Up Converter
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
TYPICAL APPLICATION
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Operates from Inputs as Low as ±30mV
Less Than ±1°C Needed Across TEG to Harvest
Energy
Proprietary Auto-Polarity Architecture
Complete Energy Harvesting Power Management
System
– Selectable V
– 2.2V, 5mA LDO
– Logic-Controlled Output
– Energy Storage Capability for Operation During
Power Good Indicator
Uses Compact Step-up Transformers
Small, 20-lead (4mm × 4mm) QFN Package or
20-Lead SSOP
Remote Sensor and Radio Power
HVAC Systems
Automatic Metering
Building Automation
Predictive Maintenance
Industrial Wireless Sensing
(THERMOELECTRIC GENERATOR)
Power Interruption
±30mV TO ±500mV
TEG
OUT
47μF
of 2.35V, 3.3V, 4.1V or 5V
1:100
1:100
VAUX
470pF
470pF
1nF
1nF
C1A
C2A
SWA
V
C1B
C2B
SWB
V
VS1
VS2
INA
INB
LTC3109
GND
V
VSTORE
OUT2_EN
PG00D
V
VLDO
VAUX
V
OUT2
OUT
5.25V
3.3V
2.2V
OPTIONAL SWITCHED OUTPUT FOR SENSORS
2.2μF
1μF
+
μP
3109 TA01a
C
STORE
+
Voltage Step-Up Converter
DESCRIPTION
The LTC
for harvesting surplus energy from extremely low input
voltage sources such as TEGs (thermoelectric genera-
tors) and thermopiles. Its unique, proprietary autopolarity
topology* allows it to operate from input voltages as low
as 30mV, regardless of polarity.
Using two compact step-up transformers and external
energy storage elements, the LTC3109 provides a com-
plete power management solution for wireless sensing
and data acquisition. The 2.2V LDO can power an external
microprocessor, while the main output can be programmed
to one of four fi xed voltages. The power good indicator
signals that the main output is within regulation. A second
output can be enabled by the host. A storage capacitor (or
battery) can also be charged to provide power when the
input voltage source is unavailable. Extremely low quies-
cent current and high effi ciency maximizes the harvested
energy available for the application.
The LTC3109 is available in a small, thermally enhanced
20-lead (4mm × 4mm) QFN package and a 20-lead SSOP
package.
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.
*Patent pending.
470μF
LOW POWER
SENSOR(S)
RADIO
®
3109 is a highly integrated DC/DC converter ideal
Auto-Polarity, Ultralow
and Power Manager
900
800
700
600
500
400
300
200
100
0
–300
V
OUT
–200
Current vs TEG Voltage
1:100 TRANSFORMERS
C1A = C1B = 1nF
V
OUT
–100
= 3.3V
V
TEG
0
(mV)
LTC3109
100
200
3109 TA01b
300
3109fa
1

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