LTC3106
300mA Low Voltage
Buck-Boost Converter with
PowerPath and 1.6µA Quiescent Current
FeaTures
DescripTion
TheLTC®3106isahighlyintegrated,ultralowvoltagebuck-
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.
n
Dual Input Buck-Boost with Integrated PowerPath™
Manager
n
n
Ultralow Start-Up Voltages: 850mV Start with No
Backup Source, 300mV with a Backup Source
Compatible with Primary or Rechargeable Backup
Batteries
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
optimizedbetweenpowersourceandload.Theoutputvolt-
n
n
n
n
Digitally Selectable V
and V
OUT
STORE
Maximum Power Point Control
Ultralow Quiescent Current: 1.6μA
Regulated Output with V or V
Above, Below
IN
STORE
or Equal to the Output
n
n
Optional Backup Battery Trickle Charger
Shelf Mode Disconnect Function to Preserve Battery
Shelf Life
ageandbackupvoltage,V
,areprogrammeddigitally,
STORE
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.
Burst Mode® Operation
n
n
n
n
n
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
Additional features include an accurate turn-on voltage, a
power good indicator for V , a user selectable 100mA
OUT
peak current limit setting for lower power applications,
thermalshutdownaswellasuserselectablebackuppower
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.
applicaTions
n
Wireless Sensor Networks
n
Home or Office Building Automation
n
Energy Harvesting
Remote Sensors
n
Typical applicaTion
Efficiency vs Input Voltage
Solar Cell Input with Primary Battery Backup
100
95
90
85
80
75
70
65
60
55
50
45
40
110
100
90
80
70
60
50
40
30
20
10
0
I
= 50mA
OUT
10µH
SW1
V
CAP
ENVSTR
RUN
SW2
3.6V
TL-5955
PRIMARY
BATTERY
V
STORE
AUX
+
2.2µF
10µF
V
V
V
V
V
EFF.
IN
IN
P.L.
EFF.
P.L.
STR
3.3V
50mA
V
IN
V
OUT
STR
600mV TO 5V
PV CELLS
+
47µF
LTC3106
1M
470µF
1µF
PGOOD
PGOOD
V
MPP
CC
V
CC
PRI
ILIMSEL
GND
0.01µF
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
3106 TA01a
INPUT VOLTAGE (V)
LTC3106 TA01b
3106f
1
For more information www.linear.com/LTC3106