LTC3803-5 Datasheet | Linear Technology

LTC3803-5 Constant Frequency Current Mode Flyback DC/DC Controller in Thin SOT .. Features - - - - - - - - - - - DESCRIPTIO VIN and VOUT Limited Only by External ponents 4.8V Undervoltage Lockout Threshold Operating Junction Temperature from - 40°C to 150°C Adjustable Slope pensation Internal Soft-Start Constant Frequency 200k Hz Operation ±1.5% Reference Accuracy Current Mode Operation for Excellent Line and Load Transient Response No Minimum Load Requirement Low Quiescent Current: 240µA Low Profile (1mm) SOT-23 Package The LTC®3803-5 is a constant frequency current mode flyback controller optimized for driving 4.5V and 6V-rated N-channel MOSFETs in high input voltage applications. The LTC3803-5 operates from inputs as low as 5V. 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 pensation can be programmed with an external resistor. The LTC3803-5 provides ±1.5% output voltage accuracy and consumes only 240µA of quiescent current. Groundreferenced current sensing allows LTC3803-5-based converters to accept input supplies beyond the LTC3803-5’s absolute maximum VCC. For simplicity, the LTC3803-5 can be powered from a high VIN through a resistor, due to its internal 8V shunt regulator. An internal undervoltage lockout shuts down the IC when the input voltage falls below 3.2V, guaranteeing at least 3.2V of gate drive to the external MOSFET. The LTC3803-5 is available in a low profile (1mm) 6-lead SOT-23 (Thin SOTTM) package. U APPLICATIO S - - - - 42V and 12V Automotive Power Supplies Tele Power Supplies Auxiliary/Housekeeping Power Supplies Power Over Ethernet , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Thin SOT is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO VIN 6V TO 50V PDZ9.1B 22k Dual Output Wide Input Range...