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Battery Charger Solution for LTE / 2G module

Vincenzo Pizzolante
Mastermind 25296 points

hi all,

a customer of mine is working on a gateway device with LTE module.

Device will be supplied from USB and will have on-board LiPo rechargeable battery.

As one of the use case will be that device will be permanently supplied from USB to reduce the number of charge and discharge cycles on the battery I was considering charger with "Power-Path Management" so device like:

bq2423x or bq2407x 

But all of the devices regulates OUT voltage to 4.4V while the LTE module accepts only up to 4.3V...

As the LTE module has fallback to 2G, it can have high peak currents (up to 2.5A) which will be filtered by the battery (so charger entering battery supplement mode) but it seems we cannot directly connect OUT from charger to the LTE module. 

Any idea how to deal with it? Which part would you recommend?

Of course we can use standard LiPo linear charger with 4.2V max output but we will experience way more charging cycles as generally they don't have constant/permanent recharge, but recharge starts when voltage drops ~5% from 4.2V 

Any idea / suggestion?

thansk a lot in advance

KR

Vincenzo

  • 0
    TI__Guru**** 166106 points
    Vincenzo,

    What is the desired fast charge current? What is the duration of the 2.5V peak current? Is a linear charger required/preferred? Most of our PowerPath chargers regulate OUT/SYS to 50-mV-150mV typical above VBATREG=4.2V. With tolerance, even the VBATREG+50mV typical value could reach 4.4V.