| Specifications | LT3477 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense Data Sheet Linear Technology Corporation |
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| Specifications | LT3477 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense Data Sheet Linear Technology Corporation |
| Business section |
|
| Specifications | LT3477 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense Data Sheet Linear Technology Corporation |
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| Content | 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 DESCRIPTIOUFEATURES APPLICATIO SU TYPICAL APPLICATIOU Efficiency330mA 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. ISN1ISP1 VINIADJ1IADJ2 FBN ISP2 200k3.3µF3.3µF VIN5V 33nF 4.7nF 330mA 3477 TA01a 10k 22k 1k 0.3Ω SW 10µH FBPSSGND LT3477 ISN2 RT SHDN VC VREF SHDN IOUT (A) 0 EFFICIENCY (%) 70 75 80 0.4 3477 TA01b 65 60 500.10.20.3 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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| Following Datasheets | 3494fb_1 (12 pages) 35-1_2 (2 pages) 35_2 (1 pages) 3500fb (28 pages) 3508fb (24 pages) 350_appnote (1 pages) 350_appnote2 (1 pages) 352001 (1 pages) 3526lfb (16 pages) 3526llb2f (16 pages) |
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