LT3477 Datasheet | Linear Technology

Features nn Dual 100m V Rail-to-Rail Current Sense Amplifiers nn Wide Input Voltage Range: 2.5V to 25V nn 3A, 42V Internal Switch nn High Efficiency Power Conversion: Up to 93% nn Drives LEDs in Boost, Buck-Boost or Buck Mode nn Frequency Set by External Resistor: 200k Hz to 3.5MHz nn Programmable Soft-Start nn Low VCESAT Switch: 0.3V at 2.5A nn Capable of Positive and Negative Output Voltages (Boost, Inverting, SEPIC, Flyback) nn Available in Thermally Enhanced 20-Lead (4mm × 4mm) QFN and 20-Lead TSSOP Packages Applications nn High Power LED Driver nn DSL Modems nn Distributed Power nn Input/Output Current Limited Boost, SEPIC, Inverting, Flyback Converters nn Constant-Voltage, Constant-Current Source 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense Description The LT®3477 is a current mode, 3A DC/DC step-up converter with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch. It bines a traditional voltage feedback loop and two unique current feedback loops to operate as a constant-current, constant-voltage source. Both current sense voltages are set at 100m V and can be adjusted independently using the IADJ1 and IADJ2 pins. Efficiency of up to 93% can be achieved in typical applications. The LT3477 Features a programmable soft-start function to limit inductor current during start-up. Both inputs of the error amplifier are available externally allowing positive and negative output voltages (boost, inverting, SEPIC, Flyback). The switching frequency is programmable from 200k Hz to 3.5MHz through an external resistor. Available in thermally enhanced 20-pin (4mm × 4mm) QFN and 20-pin TSSOP packages, the LT3477 provides a plete solution for both constant-voltage and constantcurrent applications. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 330m A LED Driver With Open LED Protection 10µH...