LTC3803

LTC3803 Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT FEATURES n VIN and VOUT Limited Only by External Components n Adjustable Slope Compensation n Internal Soft-Start n Constant Frequency 200kHz Operation n ±1.5% Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n No Minimum Load Requirement n Low Quiescent Current: 240μA n Low Profile (1mm) SOT-23 Package APPLICATIONS n Telecom Power Supplies n 42V and 12V Automotive Power Supplies n Auxiliary/Housekeeping Power Supplies n Power Over Ethernet L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTION The LTC®3803 is a constant frequency current mode flyback controller optimized for driving N-channel MOSFETs in high input voltage applications. Constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide range of load currents. Slope compensation can be programmed with an external resistor. The LTC3803 provides ±1.5% output voltage accuracy and consumes only 240μA of quiescent current. Ground-referenced current sensing allows LTC3803-based converters to accept input supplies beyond the LTC3803’s absolute maximum VCC. A micropower hysteretic start-up feature allows efficient operation at high input voltages. For si...