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LTC3873ETS8-5-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3873ETS8-5-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3873-5 1 38735fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller The LTC ®3873-5 is a constant frequency current mode controller for boost, flyback or SEPIC DC/DC converters designed to drive an N-channel MOSFET for high input and output voltage converter applications. The LTC3873-5 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during nor- mal operation and only 50μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873-5 can be powered from a high input voltage through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less. Soft-start can be programmed using an external capacitor. The LTC3873-5 is available in 8-lead ThinSOT and 2mm × 3mm DFN packages. n VIN and VOUT Limited Only by External Components n Internal or Programmable External Soft-Start n Constant Frequency 200kHz Operation n Adjustable Current Limit n Current Sense Resistor Optional n ±1.5% Voltage Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n 4.1V Undervoltage Threshold for Logic Level MOSFET Applications n Low Quiescent Current: 300μA n Low Profile (1mm) ThinSOT TM and (0.75mm) 2mm × 3mm DFN Package n Telecom Power Supplies n Automotive Power Supplies n PoE Applications Efficiency and Power Loss vs Load Current High Efficiency 5V Input, 12V Output Boost Converter PARAMETER LTC3873 LTC3873-5 VCC UV+ 8.4V 4.1V VCC UV– 4V 2.9V L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No RSENSE and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ITH IPRG GND VFB VCC SW NGATE LTC3873-5 38735 TA01a RUN/SS 11.8k 12k 108k 10μF 22μF 4.7nF 47pF 10μH VIN 5V VOUT 12V 2A 1nF IOUT (mA) 10 40 50 60 70 80 100 1000 3873 TA01b 30 20 10 0 90 100 100 1000 10 10000 |
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