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LTC3108

3108fb

BLOCK DIAGRAM

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

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.

(Refer to the Block Diagram)

3108 BD

5.25V

1.2V

VREF

VOUT

VSTORE

VLDO

OFF ON

VOUT2

VOUT

PROGRAM

COUT

PGOOD

VOUT2_EN

VOUT

VS1

VS2

PGD

VSTORE

CIN

VIN

VLDO

CSTORE

1μF

1:100

SYNC RECTIFY

REFERENCE

VOUT

2.2V

CHARGE

CONTROL

VAUX

–

ILIM

LTC3108

1.3Ω

0.5Ω

EXPOSED PAD (DFN)

2.2μF

GND (SSOP)

VREF

LDO

VREF

VBEST

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