I am designing a single lithium ion battery circuit with charge and discharge protection. It also includes a boost converter to power a constant 5V 1A load. I have came across many options for the charging/discharging circuits and have not found a perfect fit yet. The issues is with discharging. In order to supply 5V at 1A until the battery reaches 2.8V, I need to handle a max battery discharge of 2.1A (assuming boost converter efficiency of 85%) (5V*1A)/(0.85*2.8A)=2.1A. I am also looking for all components to be readily available in North America.
For the converter, both the TPS61090 and the PAM2401 both seem to work. The PAM2401 is quite cheaper so I am leaning towards this option. For the battery charge and discharge chip, due to space restrictions I prefer to use a chip that offers both charge and discharge protection with minimal external components. I have not been able to find one that can handle a discharge current of 2.1A. Texas Instruments BQ297xx series seems like a good fit however, I cant seem to get a handle on correlating the OCD(discharge over-current detection) voltage rating to the discharge current rating. So if you are able to tell me the max discharge current for the BQ297xx, or if there is a better option over the TI BQ297xx please let me know. Also, if there is a better option over the TPS61090 or the PAM2401, I would also love to know.

Thank-you!

 

My apologies, the thread title should have listed >2.1A not 2A.

 

So, it seemed I mixed up some data sheets. The BQ297XX will provide charge overcurrent detection and discharge overcurrent detection with using two FETs. It senses the voltage drop between the drain and source of the FET and once 1V is reached, the COUT or DOUT pin goes low turning off the FET. So any FET with a Rds of 0.05 Ohms will set the overcurrent to 2A? I am still not sure the BQ297XXX can handle this current since a max current is not listed. Also, I noticed it only has charge overcurrent detection and does not offer any charging capabilities so a MCP73871 or similar will still be required.