MP2733 Rt1 and Rt2 calculation

Battery Management
1

Hello there,

Can you please recommend a method/formula to calculate the Rt1 and Rt2 for the NTC resistor circuit fort he MP2733? The information does not seem to be available in the datasheet. Moreover, Rt2 in this case is in series with the NTC (in some other chips it is in parallel). Just wanted to clarify.

Thanks,
Ashwati

2

Hi akrishnan,

Thanks for posting on the MPSNow Forum.
There is section for selecting the NTC Resistor on page 51 of the datasheet, equations 7 and 8 are used to calculated the R_T2 and R_T1 values:
ntc_mp2733

Thanks,
Cindy

3

Oh, it is in a completely different section, I didn’t look correctly. In the datasheet I got online, it is on page 47 (for anyone else looking). Thanks a lot for the prompt response.

Ashwati