LTC3105

LTC3105 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up FEATURES n Low Start-Up Voltage: 250mV n Maximum Power Point Control n Wide VIN Range: 225mV to 5V n Auxiliary 6mA LDO Regulator n Burst Mode® Operation: IQ = 24µA n Output Disconnect and Inrush Current Limiting n VIN > VOUT Operation n Antiringing Control n Soft Start n Automatic Power Adjust n Power Good Indicator n 10-Lead 3mm × 3mm × 0.75mm DFN and 12-Lead MSOP Packages APPLICATIONS n Solar Powered Battery/Supercapacitor Chargers n Energy Harvesting n Remote Industrial Sensors n Low Power Wireless Transmitters n Cell Phone, MP3, PMP and GPS Accessory Chargers DESCRIPTION The LTC®3105 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 ...