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LT3759 - Wide Input Voltage Range Boost/SEPIC/Inverting Controller

The LT®3759 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter.

The LT3759 drives a low side external N-channel power MOSFET. An internal LDO regulator draws power from VIN or DRIVE to provide up to a 4.75V supply for the gate driver. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3759 can be set over a 100kHz to 1MHz range with an external resistor, or can be synchronized to an external clock using the SYNC pin.

The LT3759 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit. A window comparator on the FBX pin reports via the PGOOD pin, providing output voltage status indication. The device is available in a 12-Lead exposed pad MSOP package.

Features Wide VIN Range: 1.6V to 42V Positive or Negative Output Voltage Programming with a Single Feedback Pin PGOOD Output Voltage Status Report Accurate 50mV SENSE Threshold Voltage Programmable Soft-Start Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor Synchronizable to an External Clock Low Shutdown Current < 1μA INTVCC Regulator Supplied from VIN or DRIVE Programmable Input Undervoltage Lockout with Hysteresis Typical Application

Applications Datacom and Industrial Boost, SEPIC and Inverting Converters Distributed Power Supplies Portable Electronic Equipment Automotive Packaging

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