The LT3467/LT3467Aswitching regulators combine a 42V, 1.1A switch with a soft-start function. Pin compatible with the LT1930, its low VCESATbipolar switch enables the device to deliver high current outputs in a small footprint. The LT3467 switches at 1.3MHz, allowing the use of tiny, low cost and low height inductors and capacitors. The LT3467A switches at 2.1MHz, allowing the use of even smaller components. High inrush current at start-up is eliminated using the programmable soft-start function. A single external capacitor sets the current ramp rate. A constant frequency current mode PWM architecture results in low, predictable output noise that is easy to filter.The high voltage switch on the LT3467/LT3467A is rated at 42V, making the devices ideal for boost converters up to 40V as well as SEPIC and flyback designs. The LT3467 can generate 5V at up to 540mA from a 3.3V supply or 5V at 450mA from four alkaline cells in a SEPIC design. The LT3467A can generate 5V at up to 430mA from a 3.3V supply or 15V at 135mA from a 3.3V supply. The LT3467/LT3467A are available in a low profile (1mm) 6-lead SOT-23 package and tiny 3mm × 2mm DFN package.Switching FrequencyLT34671.3MHzLT3467A2.1MHzAPPLICATIONSDigital CamerasWhite LED Power SuppliesCellular PhonesMedical Diagnostic EquipmentLocal 5V or 12V SuppliesTFT-LCD Bias SuppliesxDSL Power Supplies