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LT3467 - 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

The LT3467/LT3467A switching regulators combine a 42V, 1.1A switch with a soft-start function. Pin compatible with the LT1930, its low VCESAT bipolar 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.

Features 1.3MHz Switching Frequency (LT3467) 2.1MHz Switching Frequency (LT3467A) Low VCESAT Switch: 330mV at 1.1A High Output Voltage: Up to 40V Wide Input Range: 2.4V to 16V Dedicated Soft-Start Pin 5V at 540mA from 3.3V Input (LT3467) 5V at 430mA from 3.3V Input (LT3467A) 12V at 270mA from 5V Input (LT3467) 12V at 260mA from 5V Input (LT3467A) Uses Small Surface Mount Components Low Shutdown Current: <1μA Pin-for-Pin Compatible with the LT1930 and LT1613 Low Profile (1mm) ThinSOT™ Package Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN Package Typical Application

Applications Digital Cameras White LED Power Supplies Cellular Phones Medical Diagnostic Equipment Local 5V or 12V Supplies TFT-LCD Bias Supplies xDSL Power Supplies Packaging

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