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Single-cell linear charge controller

MCP73831 Working Principle

Learn how MCP73831 works with an illustrated explanation and practical readings.

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MCP73831 at a glance

Follow the labeled connections and functional stages

MCP73831 working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Qualify and precondition

With valid input and a detected cell below the precharge threshold, apply a reduced current.

Step 2 / 3

Charge at constant current

The PROG resistor sets nominal current; thermal regulation can reduce it.

Step 3 / 3

Hold voltage, then finish

At 4.20 V the current tapers. AC-option termination occurs at nominal 7.5% of the programmed fast-charge current.

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