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I need to provide a 5v 2A power supply for my single-chip microcomputer system. Lithium batteries must be used for compactness and convenience. How to use two 3.7v lithium batteries to design this power supply?

Hardware design
August 19, 2020 by River 1599

I need to provide a 5v 2A power supply for my single-chip microcomputer system. In order to be small and convenient to move, I must choose a lithium battery. How to use two 3.7v lithium batteries to design this power supply.

I don't understand the power supply, so I asked you for advice.

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Aisha Posted on August 19, 2020

Two directions:

1. Two lithium batteries are connected in series to get high voltage, and DC or LDO is stepped down to 5V. Advantages: High efficiency, but not easy to charge (there are 5v charging chips such as CS5080), the two batteries are different and need to be balanced.

2. A single lithium battery, DC boosted to 5V, the most direct is the common power bank, which can be charged and discharged together with the power bank IC, such as Injixin IP5306, Fuman FM5324, etc.

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Ibrahim Posted on August 19, 2020

In fact, it is very simple. Buy a power bank circuit board for a few dollars. It is a perfect solution. But pay attention to the capacity of the lithium battery. The 5v 2A power is not small, and the circuit should also choose a single-port true 2A output circuit. Wire welding output, don't use USB interface to output, 2A current requires high wire and wire resistance!

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Rosa Posted on August 19, 2020

Two sections of 3.7v in series are equal to 7.4v, and the dcdcCX8825 chip can be used to stabilize the output to provide 5v 2A power supply to the microcontroller system.

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