I have an MCU operating at 5V and I need to use it to switch 7 12V outputs from the board.
The switch has to be a high-side one, because the 12V output will be used outside of the board.
Currently, I use PMOS-BJT high side switch to control 12V circuits with 5V output from the MCU.
The current very simplified version of the circuit:
This schematic features the main part in question - the high side switches.
I've drawn only two of them to save space, but there must be seven (or potentially even more, in the future).
My question is, is there a better way to implement many identical high-side switches to reduce the number of components, space used on PCB and complexity of the schematic?
Even though the schematic can be made prettier by reusing repetitive parts (by using hierarchical sheets in KiCad), on PCB layout there is no such pleasure and I am forced to copy-paste the high-swich components over and over.
One high-side switch requires 5 components (3 resistors, PMOS, NPN BJT), maybe there is a way to somehow re-use some components are share them between other switches, to reduce their total amount without sacrificing the functionality?
If there is no such way to share components or remove something that may be redundant, maybe you know a better way to implement such a solution, maybe even using some ICs?
That is indeed true. Thanks for noting that.
And it seems like there is no high-side swtich alternative currently in production. Some alternatives like TD62783 are nowhere to be found.
A mass-produced, commonly used, cheap high-side switch similar to ULN2803 would be a bless, of course.
For my purpose, then, I don't see much of a use of a low-side switch transistor array, perharps only to use it instead of BJTs in my schematic, while still keeping the P channel MOSFETs.
Unfortunately, no. Mainly, I look for availability in JLCPCB parts because I order PCBs there (for myself, not on behalf of a company), or in local stores. I couldn't find TD62783 or its alternatives in any of them.
Indeed, TBD62783A looks like exactly what I need, JLCPCB has them and for a good price (about $0.6 per item).
Unfortunately, I couldn't find this IC anywhere in my local stores on their websites, but availability in JLCPCB is enough for me.
Thanks a lot for your help!
The MIC2981 IC is suitable for my needs, but as far as I can see, it's a little pricier than the TBD62783A mention by @jim-p .
Comparing their datasheets couldn't find significant differences, especially for my load current < 200 mA.
Unless I find some significant disadvantages of TBD62783A, I think, I'll stick with it for now.
Nevertheless, thank you a lot for your help!
