LT3757 - Inverting Controller


Linear Technology and Digi-Key introduce LT3757 - Boost, Flyback, SEPIC and Inverting Controller

Linear Technology's LT3757 is a wide input range, current mode, DC/DC controller that is capable of generating either positive or negative output voltages. It can be configured as a boost, flyback, SEPIC or inverting converter. The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3757 can be set with an external resistor over a 100kHz to 1MHz range and can be synchronized to an external clock using the SYNC pin. A low minimum operating supply voltage of 2.9V and a low shutdown quiescent current of less than 1µA make the LT3757 ideally suited for battery-operated systems.

The LT3757 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit. The device is available in a small 10-lead DFN (3mm × 3mm) or MSOP package.

LT3757 and LT3758 - Boost, Flyback, SEPIC and Inverting Controllers
Features
  • Wide input voltage range: 2.9V to 40V
  • Positive or negative output voltage programming with a single feedback pin
  • Current mode control provides excellent transient response
  • Programmable operating frequency (100kHz-1MHz) with one external resistor
  • Synchronizeable to an external clock
  • Output overvoltage protection
  • Low shutdown current <1µA
  • Internal 7.2V low dropout voltage regulator
  • Programmable input undervoltage lockout with hysteresis
  • Programmable soft-start
  • Small 10-lead DFN (3mm × 3mm) and thermally enhanced 10-pin MSOP packages
Applications
  • Automotive and industrial boost, flyback, SEPIC and inverting converters
  • Telecom power supplies
  • Portable electronic equipment

LT3757

Manufacturer Part Number Description Available Quantity Datasheets
LT3757EDD#PBF IC REG CTRLR BST FLYBK INV 10DFN 3802
LT3757EMSE#PBF IC REG CTRL BST FLYBK INV 10MSOP 1394