LTC3873 Datasheet | Linear Technology

No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller Features n VIN and VOUT Limited Only by External ponents n Internal or Programmable External Soft-Start n Constant Frequency 200k Hz 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) Thin SOTTM and (0.75mm) 2mm × 3mm DFN Package APPLICATIONS n Tele Power Supplies n 42V and 12V Automotive Power Supplies n Portable Electronic Equipment DESCRIPTION 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 voltage 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 Thin SOT and 2mm × 3mm DFN packages. PARAMETER VCC UV+ VCC UV- LTC3873 8.4V 4V LTC3873-5 4.1V 2.9V L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No RSENSE and Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 4.7µF 100V X5R 7.5k 2.2n F 5V Output Nonisolated Tele Power Supply 10µF 10V X5R 0.1µF VIN 36V TO 72V 221k D2 T1 - D1 - VCC ITH NGATE RUN/SS IPRG 12.1k 38.3k M1...