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Demonstration circuit 989B-B is a single-output boost converter featuring the tiny NO RSENSE LTC3872-1 nonsynchronous boost controller. LTC3872-1 has the same functionality as the standard LTC3872 except that it has no frequency foldback in current limit. The demo board input voltage is from 3.0V to 4.5V without output de-rating and it has a 5V@2A (max) output. The minimum input voltage is 2.75V. When the input voltage is lower than 3V, output current should be de-rated. NO RSENSE technique reduces both solution size and power dissipation. The switching frequency is fixed at 550 kHz. With current mode control and OPTI-LOOP compensation, DC989B-B can be optimized to provide fast transient response.