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I want to use MCP73871.

Is there a battery under voltage protection in this charger IC?

or may I use a battery protection IC?

Answer for @Bimpelrekkie

I decide to use my power architecture as below.

Power Block Diagram

I add DW01A for protection as your advice.

My system has GE910QUAD gsm modem and ATmega328P MCU. My MCU works with 7.3728 MHz external crystal and 3v3 power supply. A timer is enabled LDO regulator within a time interval (15 min).

I think this architecture is true, what is your comment?

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  • \$\begingroup\$ How should this battery undervoltage protection act? Could you please clarify? \$\endgroup\$
    – Huisman
    Commented Feb 19, 2019 at 8:12
  • \$\begingroup\$ @Huisman If OP means what I think he means: it is circuitry that prevents the battery from overdischarging. When the battery voltage gets below 3 V, the battery is disconnected so that it cannot discharge further. Over discharging can be very bad (wears the cell out) for Lithium based cells. \$\endgroup\$
    – Bimpelrekkie
    Commented Feb 19, 2019 at 8:35
  • \$\begingroup\$ @Bimpelrekkie Though so already, but the requester knows it best :) \$\endgroup\$
    – Huisman
    Commented Feb 19, 2019 at 8:40
  • \$\begingroup\$ @Huisman yep you are right I mean if my battery is under 2v4 (i use DW01A in most circuits) disconnect the battery from the circuit; and want that my battery is not be overdischarged. \$\endgroup\$
    – Mehmet Günce Akkoyun
    Commented Feb 19, 2019 at 9:28

1 Answer 1

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On page one of the datasheet it says:

The MCP73871 device includes a low battery indicator

There is no mention of battery protection anywhere.

If your design uses the Low Battery Status Indicator (LBO) signal to shut down the circuits which drain the battery then I do not think you need extra battery protection.

However, it might be complex to guarantee that this will work properly under all conditions so it might be a good idea to simply add a battery protection circuit. A circuit based on the ubiquitous DW01 comes to mind. If it was my design, I would simply add that battery protection to cover my behind ;-)

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  • \$\begingroup\$ Do note the LBO does not work when charging! It only works when Vbat > Vin. Moreover, not every MCP73871 is equipped with it. \$\endgroup\$
    – Huisman
    Commented Feb 19, 2019 at 8:43
  • \$\begingroup\$ I add some information for you dude. @Bimpelrekkie \$\endgroup\$
    – Mehmet Günce Akkoyun
    Commented Feb 19, 2019 at 9:43

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