Analog Devices LT3759

Description

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 architectureresults 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 usingthe 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 Programmingwith 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 withHysteresis

Typical applications

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

More information

• Datasheet
• IC product information