FET question

freeskier89 · Oct 31, 2006

Hello there,

I was looking through the datasheet for the DS2764 Li+ Battery Monitor IC and I was looking at the application example (page 8), and I had a question about the two FETs on the top of the schematic. I am not quite familiar those symbols for fets. Is that a P-Channel MOSFET on the left and an N-Channel on the right? If so wouldn't this work for the two FETs (https://www.electro-tech-online.com/custompdfs/2006/10/FD2FFDS4897C.pdf)

Thanks!
Brandon

Analog · Oct 31, 2006

freeskier89 said:
Hello there,

I was looking through the datasheet for the DS2764 Li+ Battery Monitor IC and I was looking at the application example (page 8), and I had a question about the two FETs on the top of the schematic. I am not quite familiar those symbols for fets. Is that a P-Channel MOSFET on the left and an N-Channel on the right? If so wouldn't this work for the two FETs (https://www.electro-tech-online.com/custompdfs/2006/10/FD2FFDS4897C-1.pdf)

Thanks!
Brandon

maybe you should link the datasheet of the monitor IC....

Roff · Oct 31, 2006

They are both p-channels. The bubble on the gate is one way of denoting p-channel. Two series transistors are used to block the path through the substrate diode, which would otherwise exist if only one tranny were used.

freeskier89 · Oct 31, 2006

@Analog: Sorry about that. I thought it was obvious where one could find it (alldatasheet.com)

@Ron H: Thanks a ton! That is exactly what I was looking for. I was curious to why there wasn't just one FET, but now I know.

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