LTC3525D-3.3

LTC3525D-3.3 400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode Features n VOUT Connected to VIN in Shutdown n Up to 95% Efficiency n 0.85V Minimum Input Start-Up Voltage n Fixed Output Voltage of 3.3V n Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input n Burst Mode® Operation: IQ = 7µA n VIN Range: 0.5V to 4.5V n Only Three External Components n VIN > VOUT Operation n Anti-Ringing Control n Short-Circuit and Overtemperature Protection n Very Low Profile of 1mm n Tiny 6-Lead SC70 Package Applications n MP3 Players n Portable Instruments n Glucose Meters n Digital Cameras L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. Description The LTC®3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low as 0.85V. It offers a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525D features a fixed output voltage of 3.3V. In shutdown, VOUT is connected to VIN through the inductor. The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency....