DIY Lithium Charge Circuit: Just 4 Components with the LTC4054ES5 "LTH7" Lithium Charge Controller

Making a charge circuit for compatible 4.2v lithium ion batteries only requires four discreet components with the LTC4054ES5 (marked LTH7) IC. In this video I'm creating one on a breadboard with it's constant current set to 18mA to charge LIR2032 batteries that I use in my electronics projects.

These are programmable up to (in the case of an authentic LTC4054ES5 chip) 800mA constant charge current with proper heat dissipation. And are they ever tiny for that kind of power output!

I'm not entirely sure that signal LED is implemented correctly for the circuit. If you've got any implementation notes on that please leave it below and I'll update these notes if I run into a better implementation.

I'll have a quick diagram of the circuit I created up on PCBurn when I get around to writing up an accompanying article for the video. As always it's probably that I've missed some of the nuances of implementing these or questions you'd like included; please leave a comment!

As always with any discreet component you should refer any questions as to it's compatibility or fitness for a particular application to the manufacturer. This is a specific implementation of my particular components for your entertainment and not a recommendation or endorsement of any of them.

Analog Devices LTC4054 datasheet: https://www.analog.com/en/products/ltc4054-4.2.html

0:00 LTC4054 Component Introduction
1:30 Discreet Components Explained
6:00 Design a LTC4054 (LTH7) Circuit
12:04 Breadboard design for LTC4054
14:45 Will the Li-Ion Charger Work?
15:39 Adding a Status LED
18:26 Does the LTC4054 Charge Status Light Work?
19:54 Conclusions on our Charge Circuit

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