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Check the listing for details. TPS61023 Mini Boost Module 5V1A Boost Regulator Voltage 2-5VDC to 5V Boost Board. Condition: New. Listed at 3.75 USD. It is comparable in size to a linear regulator, but powerful enough to provide 5V at 2-5VDC input and up to 1A output. Light load automatic PFM mode to optimize efficiency and extend battery life. Module x 1.