LTC3105 - 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up


  • Low Start-Up Voltage: 250mV
  • Maximum Power Point Control
  • Wide VIN Range: 225mV to 5V
  • Auxiliary 6mA LDO Regulator
  • Burst Mode® Operation: IQ = 24μA
  • Output Disconnect and Inrush Current Limiting
  • VIN > VOUT Operation
  • Antiringing Control
  • Soft Start
  • Automatic Power Adjust
  • Power Good Indicator
  • 10-Lead 3mm × 3mm × 0.75mm DFN and 12-Lead MSOP Packages

Typical Application

LTC3105 Typical Application
LTC3105 Typical Application


The LTC3105 is a high efficiency step-up DC/DC converter that can operate from input voltages as low as 225mV. A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric generators) and fuel cells. A user programmable MPPC set point maximizes the energy that can be extracted from any power source. Burst Mode operation, with a proprietary self adjusting peak current, optimizes converter efficiency and output voltage ripple over all operating conditions.

The AUX powered 6mA LDO provides a regulated rail for external microcontrollers and sensors while the main output is charging. In shutdown, IQ is reduced to 10μA and integrated thermal shutdown offers protection from overtemperature faults. The LTC3105 is offered in 10-lead 3mm × 3mm × 0.75mm DFN and 12-lead MSOP packages.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC3105EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3105EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3105EMS#PBF MS-12 MS E 05-08-1668 Yes
LTC3105EMS#TRPBF MS-12 MS E 05-08-1668 Yes

LTC3105 Package Drawing
LTC3105 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC3105EDD#PBF 3x3 DFN-10 E $3.86 $2.70 Yes
LTC3105EDD#TRPBF 3x3 DFN-10 E $2.76 Yes
LTC3105EMS#PBF MS-12 E $3.86 $2.70 Yes
LTC3105EMS#TRPBF MS-12 E $2.76 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1587A LTC3105EDD| 250mV start-up, Step-up DC/DC Converter with Max. Power point Control $150.00
DC2080A Energy Harvesting (EH) Multi-Source Demo Board with Transducers Contact Factory
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