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.
n
n
n
n
n
Thermal Energy Harvesting Assisted Power
Management System
n
V
OUT
Tracks the Primary Battery Voltage
n
2.2V LDO Output
n
Reserve Energy Output, Clamped to 4.3V
Operates from Inputs as Low as 20mV
Battery In-Use Indicator (BAT_OFF)
I
Q
from Battery:
n
80nA When Energy Harvesting
n
6µA No Energy Harvesting
Standard, Compact Step-Up Transformer
Small, Thermally Enhanced 10-lead (3mm
×
3mm)
DFN package
applicaTions
n
n
n
n
n
n
Industrial Wireless Sensing
Remote Sensor and Radio power
HVAC
Automatic Metering
Building Automation, Security
Predictive Maintenance, Condition Monitoring
Typical applicaTion
TEG Powered Thermal Harvester with Primary Cell Life Extender
V
IN
THERMOELECTRIC
GENERATOR
T1
1:100
1nF
C1
330pF
C2
SW
GND
VAUX
10µF
LTC3107
BAT_OFF
V
OUT
VLDO
VSTORE
+
CSTORE
(OPTIONAL)
3107 TA01a
Percentage of Added Battery Life
vs TEG Surface Temperature
100000
T
A
= 23°C
10µF
3.6V
BATTERY LIFE EXTENSION (%)
V
BAT
10000
1000
3.6V
V
OUT
+
C
OUT
VLDO
2.2µF
100
10
1
CUI CP20151 TEG
24×24×22mm HEATSINK
NATURAL CONVECTION
0.5Hz X
MT
RATE (227µW AVG)
1Hz X
MT
RATE (437µW AVG)
2Hz X
MT
RATE (679µW AVG)
25
30
35
40
45
SURFACE TEMPERATURE (°C)
50
3107 TA01
3107f
For more information
www.linear.com/LTC3107
1
LTC3107
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
VAUX
VSTORE
V
OUT
V
BAT
VLDO
1
2
3
4
5
11
GND
10 SW
9 C2
8 C1
7 BAT_OFF
6 GND
SW Voltage ................................................. –0.3V to 2V
C1 Voltage (Note 5)......................–0.3V to (VAUX+0.6V)
C2 Voltage (Note 5)......................................... –8V to 8V
VAUX.....................................................15mA into VAUX
V
BAT
, VSTORE ........................................... –0.3V to 4.5V
V
OUT
, BAT_OFF .......................................... –0.3V to 4.5V
VLDO ........................................................ –0.3V to 4.5V
Operating Junction Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 5.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB (Note 4)
orDer inForMaTion
LEAD FREE FINISH
LTC3107EDD#PBF
LTC3107IDD#PBF
TAPE AND REEL
LTC3107EDD#TRPBF
LTC3107IDD#TRPBF
PART MARKING*
LGMD
LGMD
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–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.
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/
3107f
2
For more information
www.linear.com/LTC3107
LTC3107
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). VAUX = 4V, V
BAT
= 3.6V unless otherwise noted.
PARAMETER
Minimum Harvester Start-Up Voltage
Harvester No-Load Input Current
Harvester Input Voltage Range
V
BAT
Voltage Range
V
BAT
Current Limit
V
BAT
Quiescent Current
V
BAT
Reverse Current
V
OUT
Voltage (Average)
V
OUT
= 0V, VAUX = 0V (Battery Insertion)
V
OUT
= (V
BAT
– 0.4V)
VAUX > V
BAT
(Harvesting)
VAUX < V
BAT
(Not Harvesting)
VAUX = 4V, V
BAT
= 2.0V
VAUX > V
BAT
(Harvesting), Relative to V
BAT
C
OUT
≥ 47µF
VAUX < V
BAT
(Not Harvesting), Relative to V
BAT
C
OUT
≥ 47µF
0.5mA Load
I
VLDO
= 0mA to 2mA
For V
OUT
from 2.5V to 4V
I
VLDO
= 2mA
VLDO = 0V
Current Into VAUX = 1mA
VAUX > V
OUT
> V
BAT
VSTORE = 4V, VAUX > VSTORE
VSTORE = 4V
V
OUT
< V
BAT
–60mV
Measured on V
OUT
Relative to V
BAT
Measured on V
OUT
Relative to V
BAT
Sink Current = 100µA
Source Current = 0
0.6
C2 = 5V (Note 3)
–280
–60
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
Using 1:100 Transformer Turns Ratio
Using 1:100 Transformer Turns Ratio, V
IN
= 20mV,
All Outputs Charged and in Regulation
Using 1:100 Transformer Turns Ratio
l
l
l
l
MIN
TYP
20
3
MAX
30
5
500
4.0
UNITS
mV
mA
mV
V
mA
mA
nA
µA
nA
mV
mV
V
%
%
mV
mA
V
nA
nA
Ω
mV
mV
V
V
MΩ
Ω
V
STARTUP
2.0
2
30
30
70
80
6
–70
–270
2.134
–30
–220
2.2
0.8
0.1
100
10
4.13
20
4.3
10
10
120
–230
–30
0.15
V
OUT
1
0.5
60
100
110
7.5
0
–15
–140
2.266
1.5
0.2
200
40
4.48
100
100
200
–180
–15
0.2
1.4
LDO Output Voltage
LDO Load Regulation
LDO Line Regulation
LDO Dropout Voltage
LDO Current Limit
VAUX/VSTORE Clamp Voltage
V
OUT
Quiescent Current
VSTORE Leakage Current
VSTORE to V
OUT
Discharge Path Resistance
BAT_OFF Threshold (Falling)
BAT_OFF Threshold (Rising)
BAT_OFF V
OL
BAT_OFF V
OH
BAT_OFF Pull-Up Resistance
N-Channel MOSFET On-Resistance
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3107 is tested under pulsed load conditions such that T
J
≈
T
A
. The LTC3107E is guaranteed to meet specifications from 0°C to 85°C
junction temperature. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3107I is
guaranteed over the full –40°C to 125°C operating junction temperature
range. Note that the maximum ambient temperature consistent with
these specifications, is determined by specific operating conditions
in conjunction with board layout, the rated thermal package thermal
resistance and other environmental factors. The junction temperature (T
J
)
is calculated from the ambient temperature (T
A
) and power dissipation
(P
D
) according to the formula: T
J
= T
A
+ (P
D
•
θ
JA
°C/W), where
θ
JA
is the
package thermal impedance.
Note 3:
Specification is guaranteed by design and not 100% tested in
production.
Note 4:
Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
43°C/W.
Note 5:
The Absolute Maximum Rating is a DC rating. Under certain
conditions in the applications shown, the peak AC voltage on the C1 and
C2 pins may exceed their Absolute Maximum Rating. This behavior is
normal and acceptable because the current into the pin is limited by the
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