Design Specifications
| Inputs |
Outputs #1 |
| VinMin=8V |
Vout1=3.3V |
| VinMax=18V |
Iout1=2A |
Design Description
The LM20242 demonstration board is designed to provide the
design engineer with a small, fully functional buck converter
based on Current Mode Control to evaluate the LM20242
switching regulator IC. The demonstration board provides a
3.3V output with 2A current capability. The input voltage
ranges from 8V to 18V, and is optimized for 12V. The design
operates at 300KHz, a good compromise between conversion
efficiency and solution size, and employs a soft-start
sequence. The printed circuit board consists of 2 layers of 2
ounce copper on FR4 material with a thickness of 0.062 inches.
Refer to the LM20242 datasheet for complete circuit
design information. |
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Design Resources
Additional Resources
Board Photo
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Features
- Optimized for 12V to 3.3V conversion
- 2A output current, 89% efficiency
- 1.5% output voltage accuracy
- 300 kHz switching frequency
- Current Mode Control
- Starts up into pre-biased loads
- Soft-start set by external capacitor
- Precision enable pin with hysteresis
- OVP, UVLO inputs and PGOOD output
- Internally protected with peak current limit,
shutdown and restart
- Accurate current limit with frequency foldback
- Input voltage range 8V to 18V
Applications
- Simple to design, high efficiency point of load regulation from a 4.5V to 36V bus
- High Performance DSPs, FPGAs, ASICs and Microprocessors
- Communications Infrastructure, Automotive
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Design Files (Schematic, Board Layout, Gerber, and BOM)