Wide Input Voltage Range Boost/SEPIC/Inverting Controller

The LT3759 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.

Applications

* Datacom and Industrial Boost, SEPIC and Inverting Converters

* Distributed Power Supplies

* Portable Electronic Equipment

* Automotive

* 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