Datasheet

LTC3108-1
8
31081fb
For more information www.linear.com/LTC3108-1
block DiagraM
operaTion
The LTC3108-1 is designed to use a small external step-up
transformer to create an ultralow input voltage step-up
DC/DC converter and power manager. It is ideally suited
for low power wireless sensors and other applications in
which surplus energy harvesting is used to generate system
power because traditional battery power is inconvenient
or impractical.
The LTC3108-1 is designed to manage the charging and
regulation of multiple outputs in a system in which the
average power draw is very low, but there may be periodic
pulses of higher load current required. This is typical of
wireless sensor applications, where the quiescent power
draw is extremely low most of the time, except for transmit
bursts when circuitry is powered up to make measure
-
ments and transmit data.
The LTC3108-1 can also be used to trickle charge a standard
capacitor, supercapacitor or rechargeable battery, using
energy harvested from a Peltier or photovoltaic cell.
(Refer to the Block Diagram)
31081 BD
C1
C2
5M
SW
5.25V
1.2V
V
REF
SW
V
OUT
VSTORE
VLDO
OFF ON
V
OUT2
V
OUT2
V
OUT
V
OUT
PROGRAM
C
OUT
PGOOD
V
OUT2_EN
V
OUT
VS1
VS2
PGD
VSTORE
C1
C
IN
V
IN
VLDO
C
STORE
1µF
1:100
C2
SYNC RECTIFY REFERENCE
V
OUT
2.2V
CHARGE
CONTROL
VAUX
+
–
+
–
ILIM
LTC3108-1
1.3Ω
0.5Ω
1M
EXPOSED PAD (DFN)
2.2µF
GND (SSOP)
V
REF
LDO
V
REF
V
BEST