DC2457A

DC2457A demonstration circuit is a 12V, 4A, 4-switch synchronous buck-boost regulator featuring low EMI noise and small footprint. It runs at 400KHz switching frequency. SSFM can be turned on with a simple jumper, reducing EMI DC2457A also comes with other low EMI features including optimized layout, input and output filters. It passes CISPR 25 class 5 conducted and radiated EMI. The operating input voltage range of DC2457A is from 4V to 60V. The output voltage and EN/UVLO, are all programmed by resistor dividers. EN/UVLO is set so the circuit will turn off when the input voltage falls below 4V and will on when input voltage rises above 5V. DC2457A features MOSFETs that complement 5V gate drive of the LT8390® to achieve high efficiency. 60V MOSFETs are used on the input side of the 4-switch topology while 25V MOSFETs are used on the output side. Ceramic capacitors are used at both the circuit input and output because of their small size and high ripple current capability.

• 400KHz switching frequency at R5 = 100K

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