LT3479 Datasheet | Linear Technology

LT3479 3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection .. Features n n n n n n n n n DESCRIPTION The LT®3479 is a current mode, fixed frequency step-up DC/DC converter with an internal 3A, 42V switch. Efficiencies of up to 89% can be achieved in typical applications. It Features a programmable soft-start function to limit inductor current during start-up and inrush current protection to protect the LT3479 during shorts and line transients. Both inputs of the error amplifier are available to the user allowing positive and negative output voltages. Through an external resistor, the user can program the switching frequency from 200k Hz to 3.5MHz. The low profile (0.75mm) 14-pin, 4mm × 3mm DFN package provides excellent thermal performance in a small footprint. The LT3479 is also available in a thermally enhanced 16-pin TSSOP package. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Wide Input Voltage Range: 2.5V to 24V 3A, 42V Internal Switch High Efficiency Power Conversion: Up to 89% Soft-Start Frequency Set by External Resistor: 200k Hz to 3.5MHz Protection Against Input Short Circuits and Hot Plugging Low VCESAT Switch: 0.3V at 2.5A (Typical) Capable of Positive and Negative Outputs Available in Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16-Lead TSSOP Packages APPLICATIONS n n n High Power LED Driver DSL Modems Distributed Power TYPICAL APPLICATION 5V to 12V Boost Converter 4.7μH VIN 5V 2.2μF VIN VS L SHDN LT3479 SS 10n F RT GND 17.8k FBP VC 10k 2.2n F 3479 TA01 5V to 12V Efficiency VOUT 12V 0.8A 90 85 EFFICIENCY (%) 80 75 70 65 60 200k SW FBN 23.2k VREF 10μF 0.4 IOUT (A) 3479...