DESCRIPTION
The LT®3757 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages. It can be confi gured as either 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.

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