LTC3105 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up FEATURES DESCRIPTION n Low Start-Up Voltage: 250mV The LTC 3105 is a high efficiency step-up DC/DC converter n Maximum Power Point Control that can operate from input voltages as low as 225mV. A n Wide V Range: 225mV to 5V 250mV start-up capability and integrated maximum power IN n Auxiliary 6mA LDO Regulator point controller (MPPC) enable operation directly from low n Burst Mode Operation: I = 24A voltage, high impedance alternative power sources such as Q n Output Disconnect and Inrush Current Limiting photovoltaic cells, TEGs (thermoelectric generators) and n V > V Operation fuel cells. A user programmable MPPC set point maximizes IN OUT n Antiringing Control the energy that can be extracted from any power source. n Soft Start Burst Mode operation, with a proprietary self adjusting n Automatic Power Adjust peak current, optimizes converter efficiency and output n Power Good Indicator voltage ripple over all operating conditions. n 10-Lead 3mm 3mm 0.75mm DFN and 12-Lead The AUX powered 6mA LDO provides a regulated rail for MSOP Packages external microcontrollers and sensors while the main output is charging. In shutdown, I is reduced to 10A Q APPLICATIONS and integrated thermal shutdown offers protection from n overtemperature faults. The LTC3105 is offered in 10-lead Solar Powered Battery/Supercapacitor Chargers n 3mm 3mm 0.75mm DFN and 12-lead MSOP packages. Energy Harvesting n Remote Industrial Sensors L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other n Low Power Wireless Transmitters trademarks are the property of their respective owners. n Cell Phone, MP3, PMP and GPS Accessory Chargers TYPICAL APPLICATION Single Photovoltaic Cell Li-Ion Trickle Charger Output Current vs Input Voltage 80 10H MPPC DISABLED 70 225mV TO 5V V = 3.3V V OUT SW IN 60 + V OUT PHOTOVOLTAIC V OUT 10F 4.1V 50 CELL V = 4.2V OUT LTC3105 1020k 40 V = 5V FB OUT Li-Ion 30 MPPC PGOOD 332k OFF 20 ON SHDN LDO 2.2V 10F 40.2k AUX FBLDO 10 GND 1F 4.7F 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 3105 TA01a INPUT VOLTAGE (V) 3105 TA01b 3105fb 1 For more information www.linear.com/LTC3105 OUTPUT CURRENT (mA)LTC3105 ABSOLUTE MAXIMUM RATINGS (Note 1) Maximum Junction Temperature (Note 4) ............ 125C SW Voltage Storage Temperature.............................. 65C to 150C DC ............................................................ 0.3V to 6V Lead Temperature (Soldering, 10 sec.) Pulsed (<100ns) ...........................................1V to 7V MS Package ......................................................300C Voltage, All Other Pins ................................. 0.3V to 6V Operating Junction Temperature Range (Note 2) .........................................40C to 85C PIN CONFIGURATION TOP VIEW TOP VIEW FB 1 10 AUX 1 12 AUX FB LDO 2 9 V LDO 2 11 V OUT OUT 11 FBLDO 3 10 PGOOD FBLDO 3 8 PGOOD GND SHDN 4 9 SW SHDN 4 7 SW MPPC 5 8 V IN MPPC 5 6 V IN GND 6 7 GND DD PACKAGE MS PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN 12-LEAD PLASTIC MSOP T = 125C, = 130C/W, = 21C/W T = 125C, = 43C/W, = 3C/W JMAX JA JC JMAX JA JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3105EDD PBF LTC3105EDD TRPBF LFQC 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC3105EMS PBF LTC3105EMS TRPBF 3105 12-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: