boost DC/DC converter with automatic PowerPath man-
agement optimized for multisource, low power systems.
At no load, the LTC3106 draws only 1.6µA while creating
an output voltage up to 5V from either input source.
If the primary power source is unavailable, the LTC3106
seamlessly switches to the backup power source. The
LTC3106 is compatible with either rechargeable or pri-
mary cell batteries and can trickle charge a backup battery
whenever there is an energy surplus available. Optional
maximum power point control ensures power transfer is
optimized between power source and load. The output volt-
age and backup voltage, V
STORE
, are programmed digitally,
reducing the required number of external components.
Zero power Shelf Mode ensures that the backup battery
will remain charged if left connected to the LTC3106 for
an extended time.
Additional features include an accurate turn-on voltage, a
power good indicator for V
OUT
, a user selectable 100mA
peak current limit setting for lower power applications,
thermal shutdown as well as user selectable backup power
and output voltages.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Eterna and Burst Mode are registered
trademarks and PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
7432695 and 6366066.
n
n
n
n
n
n
n
n
n
n
n
n
Dual Input Buck-Boost with Integrated PowerPath™
Manager
Ultralow Start-Up Voltages: 850mV Start with No
Backup Source, 300mV with a Backup Source
Compatible with Primary or Rechargeable Backup
Batteries
Digitally Selectable V
OUT
and V
STORE
Maximum Power Point Control
Ultralow Quiescent Current: 1.6μA
Regulated Output with V
IN
or V
STORE
Above, Below
or Equal to the Output
Optional Backup Battery Trickle Charger
Shelf Mode Disconnect Function to Preserve Battery
Shelf Life
Burst Mode
®
Operation
Accurate RUN Pin Threshold
Power Good Output Voltage Indicator
Selectable Peak Current Limit: 90mA/650mA
Available in Thermally Enhanced 3mm
×
4mm 16-Pin
QFN and 20-Pin TSSOP Packages
Wireless Sensor Networks
Home or Office Building Automation
Energy Harvesting
Remote Sensors
applicaTions
n
n
n
n
Typical applicaTion
Solar Cell Input with Primary Battery Backup
10µH
SW1
V
STORE
V
CAP
ENVSTR
RUN
V
IN
470µF
1µF
SW2
V
AUX
100
95
90
85
EFFICIENCY (%)
2.2µF
3.3V
50mA
80
75
70
65
60
55
50
45
40
0.5
3.6V
TL-5955
PRIMARY
BATTERY
600mV TO 5V
PV CELLS
Efficiency vs Input Voltage
I
OUT
= 50mA
110
100
90
80
V
IN
EFF
.
V
IN
P
.L.
V
STR
EFF
.
V
STR
P
.L.
70
60
50
40
30
20
10
1
1.5
2 2.5 3 3.5 4
INPUT VOLTAGE (V)
4.5
5
0
5.5
POWER LOSS (mW)
+
10µF
+
V
OUT
LTC3106
PGOOD
MPP
ILIMSEL
GND
3106 TA01a
1M
PGOOD
V
CC
47µF
0.01µF
V
CC
PRI
LTC3106 TA01b
3106f
For more information
www.linear.com/LTC3106
1
LTC3106
absoluTe MaxiMuM raTings
(Notes 1, 6)
Supply Voltages
V
IN
, V
STORE
, V
OUT
, V
CAP
........................... –0.3V to 6V
All Other Pins ............................................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 3) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package ....................................................... 300°C
pin conFiguraTion
TOP VIEW
V
STORE
V
CAP
SW1
SW2
V
STORE
V
CAP
16 V
IN
15 GND
21
GND
14 ENVSTR
13 RUN
12 ILIMSEL
11 PRI
7
PGOOD
8
MPP
9 10
SS2
SS1
V
OUT
NC
V
AUX
V
CC
OS1
OS2
PGOOD
1
2
3
4
5
6
7
8
9
21
GND
TOP VIEW
20 SW1
19 SW2
18 V
IN
17 GND
16 ENVSTR
15 RUN
14 ILIMSEL
13 PRI
12 SS1
11 SS2
20 19 18 17
NC 1
V
OUT
2
V
AUX
3
V
CC
4
OS1 5
OS2 6
MPP 10
UDC PACKAGE
20-LEAD (3mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 52°C/W,
θ
JC
= 7°C/W (Note 5)
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 48.6°C/W,
θ
JC
= 8.6°C/W (Note 5)
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC3106EUDC#PBF
LTC3106IUDC#PBF
LTC3106EFE#PBF
LTC3106IFE#PBF
TAPE AND REEL
LTC3106EUDC#TRPBF
LTC3106IUDC#TRPBF
LTC3106EFE#TRPBF
LTC3106IFE#TRPBF
PART MARKING*
LGQH
LGQH
LTC3106FE
LTC3106FE
PACKAGE DESCRIPTION
20-Lead (3mm
×
4mm) Plastic QFN
20-Lead (3mm
×
4mm) Plastic QFN
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3106f
2
For more information
www.linear.com/LTC3106
LTC3106
temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 1.5V, V
OUT
= 3.3V, V
STORE
= 3.6V and V
AUX
in regulation unless
otherwise noted.
PARAMETER
V
IN
Start-Up Voltage
V
IN
Maximum Operating Voltage
V
IN
Minimum Operating Voltage
V
IN
Minimum No-Load Start-Up Power
V
IN
Undervoltage Quiescent Current
Shutdown Current – V
IN
Quiescent Current – V
IN
CONDITIONS
Start-Up from V
IN
, V
OUT
= V
AUX
= V
STORE
= 0V, RUN = V
IN
V
STORE
in Operating Voltage Limits, RUN > 0.613V,
ENVSTR Pin > 0.8V (Minimum Voltage Is Load Dependent)
Start-Up from V
IN
, RUN = V
IN
, V
OUT
= V
AUX
= V
STORE
= 0V
Start-Up from V
IN
, RUN = V
IN
, V
OUT
= V
AUX
= V
STORE
= 0V
V
STORE
= 0V, RUN = 0
T
J
= –40°C to 85°C (Note 4)
Switching Enabled, V
OUT
in Regulation, Non-Switching
Switching Enabled, V
OUT
in Regulation, Non-Switching,
T
J
= –40°C to 85°C (Note 4)
PRI = V
CC
, ENVSTR = V
STORE
V
OUT
in Regulation, V
CAP
Shorted to V
STORE
, PRI = V
CC
,
ENVSTR = V
STORE
PRI = V
CC
, ENVSTR = V
STORE
SS1 = 0V, SS2 = 0V
OV
UV
SS1 = 0V, SS2 = V
CC
SS1 = V
CC
, SS2 = 0V
SS1 = V
CC
, SS2 = V
CC
Output Regulation Voltage
OV
UV
OV
UV
OV
UV
MIN
l
elecTrical characTerisTics
The
l
denotes the specifications which apply over the specified junction
TYP
0.85
0.3
12
1
300
300
0.1
0.1
MAX
1.2
5.1
0.35
l
0.25
UNITS
V
V
V
µW
µA
nA
nA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
µA
nA
µA
µA
Ω
Ω
Ω
Ω
Ω
3106f
l
l
l
2
750
450
1
0.3
4.3
V
STORE
Maximum Operating Voltage
V
STORE
Minimum Operating Voltage
V
STORE
Under Voltage Lockout
V
STORE
Operating Voltage (Note 7)
l
2.1
l
l
l
l
l
l
l
l
l
l
1.730
3.90
2.70
2.81
1.85
2.91
2.08
3.90
2.91
1.75
1.755
2.14
2.145
3.22
3.23
4.90
4.92
1.778
4.00
2.78
2.90
1.90
3.00
2.15
4.00
3.00
1.8
1.8
2.2
2.2
3.3
3.3
5.0
5.0
1.6
1.6
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.5
0.5
1.9
0.9
2.9
1.826
4.10
2.86
2.99
1.95
3.08
2.21
4.10
3.08
1.85
1.845
2.25
2.245
3.40
3.38
5.10
5.08
3
2.5
1
0.3
1
0.3
0.7
0.3
25
1
1
Quiescent Current – V
AUX
Quiescent Current – V
OUT
Quiescent Current – V
STORE
Shutdown Current – V
STORE
Shelf Mode V
STORE
Leakage Current
N-Channel MOSFETs – Leakage Current
P-Channel MOSFETs – Leakage Current
N-Channel MOSFET B and C Switch R
DS(ON)
P-Channel MOSFET A1 R
DS(ON)
P-Channel MOSFET A2 R
DS(ON)
P-Channel MOSFET D1 R
DS(ON)
P-Channel MOSFET D2 R
DS(ON)
1.8V V
OUT
Selected
T
J
= –40°C to 85°C (Note 4)
2.2V V
OUT
Selected
T
J
= –40°C to 85°C (Note 4)
3.3V V
OUT
Selected
T
J
= –40°C to 85°C (Note 4)
5V V
OUT
Selected
T
J
= –40°C to 85°C (Note 4)
Enabled, V
OUT
in Regulation, Non-Switching,
T
J
= –40°C to 85°C (Note 4)
Enabled, V
OUT
in Regulation, Non-Switching,
T
J
= –40°C to 85°C (Note 4)
Enabled, V
OUT
in Regulation, Non-Switching, V
CAP
Shorted
to V
STORE
T
J
= –40°C to 85°C (Note 4)
V
IN
= 0V, V
CAP
Shorted to V
STORE
, ENVSTR = 0V
T
J
= –40°C to 85°C (Note 4)
Isolated V
STORE
, ENVSTR = 0V
B and C Switches
A1, A2, D1 and D2 Switches
V
IN
= 5V
V
IN
= 5V
V
STORE
= V
CAP
= 4.2V
V
OUT
= 3.3V
V
STORE
= V
CAP
= 4.2V
l
l
l
l
l
l
l
For more information
www.linear.com/LTC3106
3
LTC3106
temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 1.5V, V
OUT
= 3.3V, V
STORE
= 3.6V and V
AUX
in regulation unless
otherwise noted.
PARAMETER
P-Channel MOSFET AUXSW R
DS(ON)
P-Channel V
STORE
Isolation MOSFET R
DS(ON)
Peak Current Limit (V
OUT
)
CONDITIONS
V
AUX
= 5.4V
V
STORE
= 4.2V
V
OUT
Powered from V
IN
, ILIMSEL > 0.8V
V
OUT
Powered from V
IN
, ILIMSEL = 0V
V
OUT
Powered from V
STORE
, ILIMSEL > 0.8V
V
OUT
Powered from V
STORE
, ILIMSEL = 0V
V
OUT
Powered from V
IN
, ILIMSEL > 0.8V
V
OUT
Powered from V
IN
, ILIMSEL = 0V
V
OUT
Powered from V
STORE
, ILIMSEL > 0.8V
V
OUT
Powered from V
STORE
, ILIMSEL = 0V
V
STORE
Powered from V
IN
V
OUT
Falling, Percentage Below V
OUT
Percentage of V
OUT
I
PGOOD
= 100µA
V
PGOOD
= 5V
Pins: OS[1:2], SS[1:2], ILIMSEL, ENVSTR, PRI
Pins: OS[1:2], SS[1:2], ILIMSEL, ENVSTR, PRI
Pin Voltage = 5.2V,
Pins: OS[1:2], SS[1:2], ILIMSEL, PRI
V
AUX
Rising
V
AUX
Falling, Restart V
AUX
Charging
V
MPP
= 0.6V
V
MPP
= V
CC
Voltage Below V
CC
RUN Pin Voltage Increasing
T
J
= –40°C to 85°C (Note 4)
MIN
TYP
3
2
725
100
200
100
400
44
70
44
100
–9
3
0.2
0.1
MAX
UNITS
Ω
Ω
mA
mA
mA
mA
mA
mA
mA
mA
mA
%
%
V
nA
V
V
nA
nA
V
mV
µA
nA
V
V
V
V
mV
nA
elecTrical characTerisTics
The
l
denotes the specifications which apply over the specified junction
l
l
l
l
l
l
l
l
l
VALLEY Current Limit
Peak Current Limit (V
STORE
Charging)
PGOOD Threshold
PGOOD Hysteresis
PGOOD Voltage Low
PGOOD Leakage Current
V
IH
Digital Input High Logic Level
V
IL
Digital Input Low Logic Level
Digital Input Leakage Current
ENVSTR Input Leakage Current
Auxiliary Voltage Threshold
Auxiliary Voltage Hysteresis
MPP Pin Output Current
MPP Pin Shutdown Current
MPP Disable Threshold
RUN Threshold - Enable Reference
Accurate RUN Threshold - Enable Switching
from V
IN
Accurate RUN Hysteresis
RUN Input Current
530
60
140
60
300
10
30
10
60
–11
–7
10
0.3
10
80
l
l
0.8
0.1
l
l
1.21
–1
0.15
0.585
0.591
l
l
44
5.2
50
1.5
0.1
–0.8
0.4
0.6
0.6
100
0.1
1.72
10
0.55
0.615
0.609
10
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 LTC3106 is tested under pulsed load conditions such that
T
J
≈T
A
. The LTC3106E 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 LTC3106I is guaranteed over
the full –40°C to 125°C operating junction temperature range. 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 the maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors.
Note 3:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the maximum operating junction temperature
may impair device reliability or permanently damage the device.
Note 4:
Specification is guaranteed by design and not 100% tested in
production.
Note 5:
Failure to solder exposed backside of the package to the PC board
will result in a higher thermal resistance
Note 6:
Voltage transients on the switch pins beyond the DC limits
specified in Absolute Maximum Ratings are non-disruptive to normal
operation when using good layout practices as described elsewhere in the
data sheet and as seen on the demo board.
Note 7:
If PRI = GND, then charging is enabled on V
STORE
whenever
surplus energy is available from V
IN
. The OV and UV thresholds are the
maximum charge and discharge levels controlled by the LTC3106.
Note 8:
Some of the IC electrical characteristics are measured in an
open-loop test configuration that may differ from the typical operating
conditions. These differences are not critical for the accuracy of the
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