link to page 8 LTC3108 BLOCK DIAGRAM LTC3108 VOUT2 1.3Ω ILIM VOUT2 VOUT2_EN OFF ON 1.2V SYNC RECTIFY REFERENCE VREF 5M C1 VOUT 1:100 C1 VIN VOUT CIN 5.25V COUT C2 + C2 VS1 – SW SW V OUT CHARGE VOUT CONTROL VS2 VSTORE PROGRAM 0.5Ω VREF VLDO 1M PGD – PGOOD + VAUX VSTORE V V BEST LDO OUT VREF 1µF C GND (SSOP) EXPOSED PAD (DFN) VLDO STORE 3108 BD 2.2V 2.2µF OPERATION (Refer to the Block Diagram) The LTC3108 is designed to use a small external step-up average power draw is very low, but there may be peri- transformer to create an ultralow input voltage step-up odic pulses of higher load current required. This is typi- DC/DC converter and power manager. It is ideally suited cal of wireless sensor applications, where the quiescent for low power wireless sensors and other applications power draw is extremely low most of the time, except for in which surplus energy harvesting is used to generate transmit bursts when circuitry is powered up to make system power because traditional battery power is incon- measurements and transmit data. venient or impractical. The LTC3108 can also be used to trickle charge a standard The LTC3108 is designed to manage the charging and capacitor, supercapacitor or rechargeable battery, using regulation of multiple outputs in a system in which the energy harvested from a Peltier or photovoltaic cell. Rev. D 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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