Features

• Low Start-Up Voltage: 250mV
• Maximum Power Point Control
• Wide V_IN Range: 225mV to 5V
• Auxiliary 6mA LDO Regulator
• Burst Mode® Operation: I_Q = 24μA
• Output Disconnect and Inrush Current Limiting
• V_IN > V_OUT 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

Description

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, I_Q 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.