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LM20242 Demonstration Board (LM20242-REF)
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.
Inputs Outputs #1 VinMin=8V Vout1=3.3V VinMax=18V Iout1=2A 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