LTC3873-5 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 ±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) Thin SOTTM and (0.75mm) 2mm × 3mm DFN Package APPLICATIONS n Tele Power Supplies n Automotive Power Supplies n Po E Applications DESCRIPTION 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 normal 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 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 High Efficiency 5V Input, 12V Output Boost Converter 4.7n F 11.8k 47p F 12k 1n F RUN/SS IPRG NGATE 108k 10μH 10μF 22μF VIN 5V VOUT 12V...