5 V Power Controller
Battery operation from 2 V to 8 V
Published in issue 400, April 2010
These days many components and microcontrollers are designed for low-voltage operation and can be powered directly from a battery. For various reasons, however, it is often necessary to power them from a 5 V supply. Designing a high-efficiency supply is time-consuming, and so here we present a universal solution in the form of our 5 V power controller.
• Input voltage range 2 V to 8 V (for example from two AA cells or two lithium-ion or lithium-polymer cells)
• Power a 5 V circuit drawing up to 150 mA using two AA cells
• Especially designed for 5 V microcontroller circuits
• Efficiency: 75 % at 2 V and >76 % from 3 V to 8 V input voltage
• Standard, readily available components
• All connections on 2.54 mm pitch headers
• Soft-off function under processor control
• Power on button can also be used as general input button
• Low current consumption in soft-off standby |
Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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