Version 13
    Linear Technology > Power Management > Step-Up (Boost) Regulator >

    Features of LTC3535 Step-Up DC/DC Converter:

    • Two Independent Step-Up Converters
    • Each Channel Delivers 3.3V at 100mA from a Single Alkaline/NiMH Cell or 3.3V at 200mA from Two Cells
    • VIN Start-Up Voltage: 680mV
    • 1.5V to 5.25V VOUT Range
    • Up to 94% Efficiency
    • Output Disconnect
    • 1MHz Fixed Frequency Operation
    • VIN > VOUT Operation
    • Integrated Soft-Start
    • Current Mode Control with Internal Compensation
    • Burst Mode® Operation with 9μA IQ Each Channel
    • Internal Synchronous Rectifier
    • Logic Controlled Shutdown (IQ < 1μA)
    • Anti-Ring Control

    The Demonstration circuit 1483 is a dual high efficiency synchronous boost converter capable of operating with an input voltage range from 0.8V to 5V. The 12 lead 3X3 mm thermally enhanced DFN package with a 1MHz switching frequency and the 550mA internal switches provide a very tiny step-up solution. The LTC3535 can be powered from separate input supplies that can be greater or less than the output voltage although the efficiency and maximum output current is reduced when VIN is greater than VOUT. Also featured is burst mode operation for high efficiency at low current levels and a true input-to-output disconnect which allows the output to drop to zero volts when shutdown and provides soft start and current limiting.

    The demonstration circuit allows the user to quickly evaluate the LTC3535 performance. Individual jumpers are provided for selecting a variety of output voltages from 1.8V to 5V. Jumpers also allow separate low quiescent current shutdown and the ability to paralled the inputs. Terminals on the board allow easy hookup to input supplies and output loads.

    Key Applications: Medical Instruments, Noise Canceling Headphones, Energy Harvesting, Bluetooth Headsets