DESCRIPTION
The LT®3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, and overtemperature conditions. The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 3.3A.

FEATURES
■ 3.3A, 42V Combined Power Switch
■ Master/Slave (1.9A/1.4A) Switch Design
■ Output Short Circuit Protection
■ Wide Input Range: 2.5V to 22V Operating, 40V Maximum Transient
■ Switching Frequency Up to 2.5MHz
■ Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter
■ User Configurable Undervoltage Lockout
■ Low VCESAT Switch: 250mV at 2.75A (Typical)
■ Can be Synchronized to External Clock
■ Can Be Synchronized to other Switching Regulators
■ High Gain SHDN Pin Accepts Slowly Varying Input Signals
■ 14-Pin 4mm × 3mm DFN and 16-Lead MSE Packages

APPLICATIONS
■ Local Power Supply
■ Vacuum Fluorescent Display (VFD) Bias Supplies
■ TFT-LCD Bias Supplies
■ Automotive Engine Control Unit (ECU) Power