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LTC3873EDDB Datasheet(PDF) 1 Page - Linear Technology |
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LTC3873EDDB Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3873 1 3873fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller The LTC ®3873 is a constant frequency current mode, boost, flyback or SEPIC DC/DC controller that drives an N-channel power MOSFET in high input and output volt- age converter applications. Soft-start can be programmed using an external capacitor. The LTC3873 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 55μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873 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. The LTC3873 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 Maximum 60V on SW Node with RDS(ON) Sensing n ±1.5% Voltage Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n Low Quiescent Current: 300μA n Low Profile (1mm) ThinSOT TM and (0.75mm) 2mm × 3mm DFN Package n Telecom Power Supplies n 42V and 12V Automotive Power Supplies n Portable Electronic Equipment Efficiency and Power Loss vs Load Current 5V Output Nonisolated Telecom Power Supply PARAMETER LTC3873 LTC3873-5 VCC UV+ 8.4V 3.9V 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. VCC ITH NGATE LTC3873 RUN/SS GND 0.1μF 100μF 6.3V X5R 3 VOUT 5V 2A MAX 2.2nF 10μF 10V X5R 4.7μF 100V X5R 7.5k 221k D1 T1 D2 VIN 36V TO 72V 68mΩ 3873 TA01a M1 • • SW IPRG VFB 12.1k 38.3k LOAD CURRENT (mA) 10 40 50 60 70 80 1000 3873 TA01b 30 20 10 0 90 100 EFFICIENCY 1000 500 2000 1500 2500 10 3000 POWER LOSS VIN = 72V VIN = 60V VIN = 48V VIN = 36V |
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