LTC3525D-3.3 Datasheet

• V_OUT Connected to V_IN in Shutdown
• Up to 95% Efficiency
• 0.85V Minimum Input Start-Up Voltage
• Fixed Output Voltage of 3.3V
• Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
• Burst Mode^® Operation: I_Q = 7μA
• V_IN Range: 0.5V to 4.5V
• Only Three External Components
• V_IN > V_OUT Operation
• Anti-Ringing Control
• Short-Circuit and Overtemperature Protection
• Very Low Profile of 1mm
• Tiny 6-Lead SC70 Package

• MP3 Players
• Portable Instruments
• Glucose Meters
• Digital Cameras

The LTC3525D-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, V_OUT is connected to V_IN 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. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.

Other features include anti-ringing control and thermal shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package.