Hello, the LTC4006 charge controller for Li-Ion batteries supports a NTC for the temperature check of the batterie to be charged. The standard value for the NTC in the datasheet is 10k. Now we have got a ready-made battery equipped with a 300 Ohm NTC. We expect resistances between ~130 and ~900 Ohm for an allowed temperature range for the battery of 0° up to 50°C. I get the controller working for NTC values down to 220 Ohm, but not below. Has anybody experience with this special configuration? Thank you in advance! Klaus
There is no way to use a low resistance NTC directly. Even if it's not mentioned in the datasheet, I would not expect to draw more then some 100µA from NTC pin without affecting the resulting voltage significantly (not reaching the threshold levels of NTCVR*0.5 resp. NTCVR*0.125). Therefore replace the NTC or use an active circuit for decoupling.
Thank you for your appraisal! That is what I suspected. Unfortunately it is not possible to change the NTC. So I will have in fact to prepare a work-around circuit.
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