LTC3108-1
BLOCK DIAGRAM
LTC3108-1
V
OUT2
1.3Ω
V
ILIM
OUT2
V
OUT2_EN
OFF ON
1.2V
REF
SYNC RECTIFY
REFERENCE
V
5M
C1
V
OUT
1:100
C1
V
V
OUT
IN
C
C
IN
5.25V
OUT
C2
+
C2
VS1
VS2
–
V
SW
SW
OUT
CHARGE
CONTROL
V
OUT
PROGRAM
VSTORE
0.5Ω
V
REF
VLDO
1M
PGD
–
+
PGOOD
VAUX
VSTORE
V
LDO
BEST
V
V
REF
OUT
C
1μF
STORE
VLDO
GND (SSOP)
EXPOSED PAD (DFN)
31081 BD
2.2V
2.2μF
OPERATION (Refer to the Block Diagram)
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
whichsurplusenergyharvestingisusedtogeneratesystem
power because traditional battery power is inconvenient
or impractical.
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
drawisextremelylowmostofthetime,exceptfortransmit
bursts when circuitry is powered up to make measure-
ments and transmit data.
TheLTC3108-1canalsobeusedtotricklechargeastandard
capacitor, supercapacitor or rechargeable battery, using
energy harvested from a Peltier or photovoltaic cell.
The LTC3108-1 is designed to manage the charging and
regulation of multiple outputs in a system in which the
31081fa
8
Linear Systems [ Linear Systems ]
