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Linear Technology Electronic Components Datasheet

LTC3109 Datasheet

Ultralow Voltage Step-Up Converter and Power Manager

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LTC3109
Features
Auto-Polarity, Ultralow
Voltage Step-Up Converter
and Power Manager
Description
n Operates from Inputs as Low as ±30mV
n Less Than ±1°C Needed Across TEG to Harvest
Energy
n Proprietary Auto-Polarity Architecture
n Complete Energy Harvesting Power Management
System
– Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
– 2.2V, 5mA LDO
– Logic-Controlled Output
– Energy Storage Capability for Operation During
Power Interruption
n Power Good Indicator
n Uses Compact Step-up Transformers
n Small, 20-lead (4mm × 4mm) QFN Package or
20-Lead SSOP
Applications
n Remote Sensor and Radio Power
n HVAC Systems
n Automatic Metering
n Building Automation
n Predictive Maintenance
n Industrial Wireless Sensing
The LTC®3109 is a highly integrated DC/DC converter ideal
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 fixed 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 efficiency 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.
Typical Application
TEG
(THERMOELECTRIC GENERATOR)
±30mV TO ±500mV
1:100
••
47µF
1:100
••
1nF
470pF
1nF
470pF
C1A VOUT2
C2A VOUT
SWA VLDO
VINA
LTC3109
C1B
C2B PG00D
OPTIONAL SWITCHED OUTPUT FOR SENSORS
3.3V
2.2V
2.2µF
+
470µF
LOW POWER
RADIO
µP SENSOR(S)
VAUX
SWB
VINB
VS1
VS2
VOUT2_EN
VSTORE
VAUX
GND
5.25V
+
1µF
CSTORE
3109 TA01a
For more information www.linear.com/LTC3109
VOUT Current vs TEG Voltage
900 1:100 TRANSFORMERS
800 C1A = C1B = 1nF
VOUT = 3.3V
700
600
500
400
300
200
100
0
–300
–200
–100 0 100
VTEG (mV)
200 300
3109 TA01b
3109fb
1


Linear Technology Electronic Components Datasheet

LTC3109 Datasheet

Ultralow Voltage Step-Up Converter and Power Manager

No Preview Available !

LTC3109
Absolute Maximum Ratings (Note 1)
SWA, SWB, VINA, VINB Voltage..................... –0.3V to 2V
C1A, C1B Voltage.......................................... –0.3V to 6V
C2A, C2B Voltage (Note 6)............................... –8V to 8V
VOUT2, VOUT2_EN........................................... –0.3V to 6V
VS1, VS2, VOUT, PGOOD............................... –0.3V to 6V
VLDO, VSTORE............................................. –0.3V to 6V
VAUX....................................................... 15mA Into VAUX
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
Pin Configuration
TOP VIEW
VSTORE 1
VAUX 2
VOUT
VOUT2
VOUT2_EN
3
4
5
20 19 18 17 16
15 SWA
14 VINA
21
GND
13 VINB
12 SWB
11 GND
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21) IS GND (Note 5)
VS1 1
VS2 2
VSTORE 3
VAUX 4
VOUT
VOUT2
VOUT2_EN
PGOOD
5
6
7
8
VLDO 9
GND 10
TOP VIEW
20 C1A
19 C2A
18 GND
17 SWA
16 VINA
15 VINB
14 SWB
13 GND
12 C2B
11 C1B
GN PACKAGE
20-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3109EUF#PBF
LTC3109EUF#TRPBF
3109
20-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3109IUF#PBF
LTC3109IUF#TRPBF
3109
20-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3109EGN#PBF
LTC3109EGN#TRPBF
LTC3109GN
20-Lead Plastic SSOP
–40°C to 125°C
LTC3109IGN#PBF
LTC3109IGN#TRPBF
LTC3109GN
20-Lead Plastic SSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3109fb
2 For more information www.linear.com/LTC3109


Part Number LTC3109
Description Ultralow Voltage Step-Up Converter and Power Manager
Maker Linear Technology
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LTC3109 Datasheet PDF






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