The LTC3803IS6-3 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 LTC3803IS6-3 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 simplicity, the LTC3803IS6-3 can also be powered from a high VIN through a resistor, due to its internal shunt regulator. An internal undervoltage lockout shuts down the LTC3803IS6-3 when the input voltage is too low to provide sufficient gate drive to the external MOSFET.
The LTC3803IS6-3 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package.
Turn On VoltageFrequencyLTC38038.7V200kHzLTC3803-38.7V300kHzLTC3803-54.8V200kHzFeature
- VIN and VOUT Limited Only by External Components
- Adjustable Slope Compensation
- Internal Soft-Start
- Constant Frequency 200kHz 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
Applications
- Telecom Power Supplies
- 42V and 12V Automotive Power Supplies
- Auxiliary/Housekeeping Power Supplies
- Power Over Ethernet
(Picture: Pinout)
