A USB-powered device is constrained to draw no more than 0.5A from the input supply. The input-supply voltage must be re-regulated to provide +5V ± 5%. Efficiency is paramount in order to maximize the power available from the port. In addition, this application can be implemented with all-ceramic capacitors for lowest profile and high availability. This MAX1790 circuit delivers +5V at 200mA from +4.35V input with > 90% efficiency.
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