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LT3477EUF Datasheet(PDF) 1 Page - Linear Technology |
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LT3477EUF Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT3477 3477fb 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense ■ Dual 100mV Rail-to-Rail Current Sense Amplifiers ■ Wide Input Voltage Range: 2.5V to 25V ■ 3A, 42V Internal Switch ■ High Efficiency Power Conversion: Up to 93% ■ Drives LEDs in Boost, Buck-Boost or Buck Mode ■ Frequency Set by External Resistor: 200kHz to 3.5MHz ■ Programmable Soft-Start ■ Low VCESAT Switch: 0.3V at 2.5A ■ Capable of Positive and Negative Output Voltages (Boost, Inverting, SEPIC, Flyback) ■ Available in Thermally Enhanced 20-Lead (4mm × 4mm) QFN and 20-Lead TSSOP Packages ■ High Power LED Driver ■ DSL Modems ■ Distributed Power ■ Input/Output Current Limited Boost, SEPIC, Inverting, Flyback Converters ■ Constant-Voltage, Constant-Current Source DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO Efficiency 330mA LED Driver with Open LED Protection The LT ®3477 is a current mode, 3A DC/DC step-up con- verter with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch. It combines 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 100mV and can be adjusted independently using the IADJ1 and IADJ2 pins. Efficiency of up to 91% can be achieved in typical applica- tions. The LT3477 features a programmable soft-start func- tion to limit inductor current during start-up. Both inputs of the error amplifier are available externally allowing posi- tive and negative output voltages (Boost, Inverting, SEPIC, Flyback). The switching frequency is programmable from 200kHz 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 complete solution for both constant-voltage and con- stant-current applications. ISN1 ISP1 VIN IADJ1 IADJ2 FBN ISP2 200k 3.3 µF 3.3 µF VIN 5V 33nF 4.7nF 330mA 3477 TA01a 10k 22k 1k 0.3 Ω SW 10 µH FBP SS GND LT3477 ISN2 RT SHDN VC VREF SHDN IOUT (A) 0 70 75 80 0.4 3477 TA01b 65 60 50 0.1 0.2 0.3 55 90 85 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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