Author Topic: Linear I2C battery charger  (Read 891 times)

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Offline gaminnTopic starter

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Linear I2C battery charger
« on: November 24, 2019, 09:06:43 pm »
Hi,
I'm looking for I2C controlled 1 cell li-ion baterry charger with power path capability and with minimal external components. Input voltage is 5 V, charging current max 800 mA - 1 A.

This device is exactly what I want: https://www.monolithicpower.com/en/products/battery-management/linear-chargers/mp2667.html . But I think it is not possible to buy it aywhere...

Do you know a similar component?
 

Offline jhpadjustable

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Re: Linear I2C battery charger
« Reply #1 on: November 24, 2019, 09:39:35 pm »
What, exactly, do you want to control dynamically via I2C, instead of using programming resistors?

If you are okay with 500mA charging max current, the bq25155 is a functional replacement for that MPS part, with "minimal' support components. It even comes with two LDOs built-in: a software-programmable 150mA LDO, and a fixed always-on 1.8V 10mA LDO. (EDIT: But it's BGA.)

If you got rid of the linear topology requirement, you would have dozens of choices that meet your other requirements, just from TI alone, in relatively easy-to-use QFN packages.
« Last Edit: November 24, 2019, 09:46:14 pm by jhpadjustable »
"There are more things in heaven and earth, Arduino, than are dreamt of in your philosophy."
 

Offline jhpadjustable

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Re: Linear I2C battery charger
« Reply #2 on: November 24, 2019, 09:48:20 pm »
For a non-BGA alternative, see the 500mA LP3947 in a 0.5mm DFN.
"There are more things in heaven and earth, Arduino, than are dreamt of in your philosophy."
 

Offline gaminnTopic starter

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Re: Linear I2C battery charger
« Reply #3 on: November 25, 2019, 03:19:57 pm »
I don't have much space on my board, every component saved is plus.

However, I ended with non-power path non-I2C BQ24040 - it needs 2 resistors and 2 capacitors only.
 


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