LTC3108 Linear Technology, LTC3108 Datasheet - Page 7

• Manufacturer Part Number: LTC3108
• Description: Ultralow Voltage Step-Up Converter and Power Manager
• Manufacturer: Linear Technology

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OPERATION
The LTC3108 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 is designed to manage the charging and
regulation of multiple outputs in a system in which the
BLOCK DIAGRAM
V
IN
C
IN
1:100
SW
(Refer to the Block Diagram)
C1
C2
1μF
0.5Ω
(DFN Package Shown)
C1
C2
SW
VAUX
GND (SSOP)
SYNC RECTIFY
V
OUT
EXPOSED PAD (DFN)
VHOLD
V
OUT
V
BEST
5.25V
REFERENCE
V
REF
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 can also be used to trickle charge a standard
capacitor, supercapacitor or rechargeable battery, using
energy harvested from a Peltier or photovoltaic cell.
CONTROL
CHARGE
LTC3108
1.2V
V
LDO
REF
V
REF
–
+
VLDO
ILIM
2.2μF
2.2V
+
–
1.3Ω
VLDO
1M
V
5M
OUT2_EN
VSTORE
V
V
OUT2
PGD
VS1
VS2
OUT
3108 BD
LTC3108
PGOOD
V
OFF ON
OUT2
V
PROGRAM
OUT
C
C
STORE
OUT
V
OUT
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3108p