LTC3105 Datasheet | Linear Technology

400m A Step-Up DC/DC Converter with Maximum Power Point Control and 250m V Start-Up Features n Low Start-Up Voltage: 250m V n Maximum Power Point Control n Wide VIN Range: 225m V to 5V n Auxiliary 6m A 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 225m V. A 250m V 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 6m A 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. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Thin SOT and Power Path are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Single Photovoltaic Cell Li-Ion Trickle Charger 10µH 225m V TO 5V + PHOTOVOLTAIC CELL - VIN 10µF VOUT LTC3105 OFF ON...