LT®3957/LT®3958 Converters


Linear Technology DC/DC converters for automotive, telecom, industrial applications

Linear Technology's LT3957 and LT3958 DC/DC converters can generate a positive or negative regulated output voltage with two internal voltage feedback error amplifiers and reference voltages. One set is for positive output voltages, and the other is for negative output voltages, both off a single feedback pin. With a programmable fixed or synchronizable operating frequency from 100kHz to 1MHz, designers can choose a wide range of inductors and capacitors to optimize size, performance, and cost.

Its current-mode control results in stable operation over a wide range of supply and output voltages. The device supports designs using only ceramic capacitors, enabling a smaller solution size. Additional features include programmable soft start, adjustable input undervoltage lockout as well as output overvoltage and overcurrent protection.

Features
  • For boost, flyback, SEPIC, and inverting applications
  • Wide input operating voltage: 3V to 40V (LT3957)
  • Wide input operating voltage: 5V to 80V (LT3958)
  • Onboard 5A/40V power switch (LT3957)
  • Onboard 84V/3.5A power switch (LT3958)
  • Positive or negative output voltage setting with a single feedback pin
  • Selectable fixed 100kHz to 1MHz operating frequency
  • Synchronizable to an external clock
  • Programmable soft start
  • True current-mode control
  • Additional pin-to-pin IC spacing
  • Output overvoltage and overcurrent protection
  • Programmable input undervoltage lockout with hysteresis

LT®3957/LT®3958

Manufacturer Part Number Description Available Quantity Datasheets
LT3957EUHE#PBF IC REG MULTI CONFIG ADJ 36VQFN 1363
LT3958EUHE#PBF IC REG MULTI CONFIG ADJ 36VQFN 2309