LTC3803
PRODUCTIONConstant Frequency Current Mode Flyback DC/DC Controller in ThinSOT
- Part Models
- 8
- 1ku List Price
- Starting From $1.93
Overview
- 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
The LTC3803 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 simplicity, the LTC3803 can also be powered from a high VIN through a resistor, due to its internal shunt regulator. An internal undervoltage lockout shuts down the LTC3803 when the input voltage is too low to provide sufficient gate drive to the external MOSFET.
The LTC3803 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package.
| Turn On Voltage | Frequency | |
| LTC3803 | 8.7V | 200kHz |
| LTC3803-3 | 8.7V | 300kHz |
| LTC3803-5 | 4.8V | 200kHz |
Applications
- Telecom Power Supplies
- 42V and 12V Automotive Power Supplies
- Auxiliary/Housekeeping Power Supplies
- Power Over Ethernet
Documentation
Data Sheet 1
User Guide 2
Technical Articles 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3803ES6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC3803ES6#TRPBF | 6-Lead TSOT-23 | ||
| LTC3803HS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC3803HS6#TRPBF | 6-Lead TSOT-23 | ||
| LTC3803IS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC3803IS6#TRPBF | 6-Lead TSOT-23 | ||
| LTC3803MPS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC3803MPS6#TRPBF | 6-Lead TSOT-23 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 2
- LTC3803 Demo Circuit - 5V Output Nonisolated Telecom Housekeeping Power Supply
- LTC4441 - Power Monitor, Control, and Protection, LTC3803 - Switching Regulators
Models for the following parts are available in LTspice:
- LTC3803
- LTC3803-3
- LTC3803-5
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
