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LT3845 Datasheet(PDF) 1 Page - Linear Technology |
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LT3845 Datasheet(HTML) 1 Page - Linear Technology |
1 / 26 page LT3845 1 3845fd TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency The LT ®3845 is a high voltage, synchronous, current mode controller used for medium to high power, high efficiency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage). An onboard regulator simplifies the biasing requirements by providing IC power directly from VIN. Burst Mode ® operation maintains high efficiency at light loads by reducing IC quiescent current to 120μA. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation. Additional features include adjustable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, 10μA shutdown current, short-circuit protection and a programmable soft-start. The LT3845 is available in a 16-lead thermally enhanced TSSOP package and 16-pin through hole N package. ■ High Voltage Operation: Up to 60V ■ Synchronizable Up to 600kHz ■ Adjustable Constant Frequency: 100kHz to 500kHz ■ Output Voltages Up to 36V ■ Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through ■ Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads ■ Programmable Soft-Start ■ 120μA No Load Quiescent Current ■ 10μA Shutdown Supply Current ■ 1% Regulation Accuracy ■ Standard Gate N-Channel Power MOSFETs ■ Current Limit Unaffected by Duty Cycle ■ Reverse Overcurrent Protection ■ 16-Lead Thermally Enhanced TSSOP Package, 16-Pin PDIP ■ 12V and 42V Automotive and Heavy Equipment ■ 48V Telecom Power Supplies ■ Avionics and Industrial Control Systems ■ Distributed Power Converters High Voltage Step-Down Regulator 48V to 12V at 75W Efficiency and Power Loss vs Load Current L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258. VIN SHDN CSS BURST_EN VFB VC SYNC fSET BOOST TG SW VCC BG PGND SENSE+ SENSE– SGND BAS521 1N4148 3845 TA01a 0.1μF 1500pF Si7370DP Si7370DP B160 15μH 0.01Ω LT3845 1μF 33μF ×3 VOUT 12V 75W 1M 82.5k 16.2k VIN 20V TO 55V 2.2μF 100V 49.9k 20k 100pF 2200pF 143k 47μF 63V LOAD CURENT (A) 65 80 75 70 100 95 90 85 0 3 2 1 7 6 5 4 3845 TA01b 0.1 10 1 VIN = 48V LOSS |
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Similar Description - LT3845_15 |
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