DESCRIPTION
The LT®3957A is a wide input range, current mode DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V 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: 3V to 40V
■ Single Feedback Pin for Positive or Negative Output Voltage
■ Internal 5A/40V Power Switch
■ Current Mode Control Provides Excellent Transient Response
■ Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
■ Synchronizable to an External Clock
■ Low Shutdown Current < 1μA
■ Internal 5.2V Low Dropout Voltage Regulator
■ Programmable Input Undervoltage Lockout with Hysteresis
■ Programmable Soft-Start
■ Thermally Enhanced QFN (5mm × 6mm) Package

APPLICATIONS
■ Automotive
■ Telecom
■ Industrial