I need an ESP32 to drive two p-MOSFETs (https://datasheet.lcsc.com/szlcsc/1808131746_Diodes-Incorporated-DMP2104LP-7_C260933.pdf) as PWM controlled output for a motor.
As the ESP32 can not deliver enough current, I want to add a simple gate driver for the MOSFETs.
Board space is very limited, so a dedicated driver IC is not an option.
I now have two solutions:
First, a driver with a NPN BJT, with a current rating of 600mA, using a MMDT2222A (https://datasheet.lcsc.com/szlcsc/Diodes-Incorporated-MMDT2222A-7-F_C96379.pdf)
Second, a driver using a NPN+PNP BJT in push-pull configuration, with a current rating of 200mA, using a NST3946DXV6 (https://datasheet.lcsc.com/szlcsc/ON-Semicon-ON-NST3946DXV6T1G_C232646.pdf)
Space wise, both versions fit on the board, but which version is preferable regarding speed and power consumption? The device is battery driven and very small, so power consumption and heat dissipation are important.
Best Answer
Your NPN transistor MMDT2222A-7-F is in a SOT363-6 package. It lists currently at Mouser at $0.45 in quantity 1.
You can go to the same manufacturer and get the ZXGD3009DY gate driver which is also in the SOT363-6 package. It currently lists at $0.41 in quantity 1.
This ZXGD3009DY (data sheet) offers up a NPN and PNP which can be joined to produce a push-pull type gate driver as you show in your second circuit.
The chip has no space penalty and gives you the faster switching performance for your MOSFETs to save in switching losses power dissipation.