LT3581 Datasheet | Linear Technology

LT3581 3.3A Boost/Inverting DC/DC Converter with Fault Protection Features n 3.3A, 42V bined Power Switch n Master/Slave (1.9A/1.4A) Switch Design n Output Short Circuit Protection n Wide Input Range:2.5V to 22V Operating, 40V Maximum Transient n Switching Frequency Up to 2.5MHz n Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter n User Configurable Undervoltage Lockout n Low VCESAT Switch: 250m V at 2.75A (Typical) n Can be Synchronized to External Clock n Can Be Synchronized to other Switching Regulators n High Gain SHDN Pin Accepts Slowly Varying Input Signals n 14-Pin 4mm × 3mm DFN and 16-Lead MSE Packages APPLICATIONS n Local Power Supply n Vacuum Fluorescent Display (VFD) Bias Supplies n TFT-LCD Bias Supplies n Automotive Engine Control Unit (ECU) Power L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7579816. 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. The LT3581 is ideal for many local power supply designs. It can be easily configured in Boost, SEPIC, Inverting or Flyback configurations, and is capable of generating 12V at 830m A, or - 12V at 625m A from a 5V input. In addition, the LT3581’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are very efficient and require fewer ponents than traditional circuits. The LT3581’s switching frequency range can be set bet­ween 200k Hz and 2.5MHz. The part may be clocked internally at a frequency set by the resistor from the RT pin to ground, or it may be synchronized to an external clock....