Quad MOSFET IC suggestions for pager motors?

vanmunch

Hey Everyone,

I’ve been working on a project that uses 4 little pager motors (3V) that I’m currently controlling using four distinct MOSFETs and flywheel diodes. I’d like to reduce the number of components and find a single chip with 4 MOSFETs built into it, but I’m having a hard time finding a SM chip with 4 distinct MOSFETs . Does anyone have any suggestions? The motors only spin one way so I just have to be able to turn them on and off. Thanks!

Dave

LoopyByteloose

You could try Digikey and Mouser for what you desire.

erco

A TPIC2701 is DMOS version of a ULN 2803 if you want a DIP package, but not erco-cheap. http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=tpic2701&_sop=15

Phil Pilgrim (PhiPi)

vanmunch,

You need to provide more information:

1. What is the peak current draw of the motors?

2. What voltage are you driving the gates with?

3. Can all four motors run at once, or just one at a time?

-Phil

vanmunch

Thanks guys, one of the first things that i did was look on Mouser, but it seems that the quads are all meant for special uses with extra diodes and/or are tied together (ie same gate, same source is fine though).

Yikes! those DIPs are expensive, you just ruined your average.

Sorry, the motors could be all used at once (PW @100%) so 4 motors running at 3V, 90 mA max (360mA)

Dave

Phil Pilgrim (PhiPi)

... aaand what voltage are you using to drive the MOSFET gates, please?

-Phil

vanmunch

opps, I forget that there are other MCs other than the propeller. 3.3V for driving the gate.

Dave

Phil Pilgrim (PhiPi)

A quad will be hard to come by, but here's a dual that might work for you:

http://www.digikey.com/product-detail/en/BSD840N%20H6327/BSD840N%20H6327CT-ND/3196629

-Phil

tonyp12

You don't say if you are using low side drive, but here is a good cheap dual n-channel with 1.8V Vgs
http://www.mouser.com/ProductDetail/Diodes-Incorporated/DMN63D8LDW-7/?qs=%2fha2pyFadugzu5ZdZZl5NwG70OSSEyB0c4VUEWk5dSpCsAKh5nILnQ%3d%3d

Here is a 7 array, so maybe you can use the other 3 for something else
http://www.mouser.com/Search/Refine.aspx?Keyword=ULN2003LV

vanmunch

Thanks everyone! The forum is back in action! This is really great, I was worried that I was just missing a key word or something and that was why I couldn't find any quads. I'll try a couple of each.

Thanks again everyone!

Dave

jmg

tonyp12 wrote: »

Here is a 7 array, so maybe you can use the other 3 for something else
http://www.mouser.com/Search/Refine.aspx?Keyword=ULN2003LV

One caution, the generic ULN2003 part code is a Darlington-Array, so has higher VSAT than MOSFETS, but there are vendors offering MOSFET equivalents.

examples are TI's DRV777 and TPL7407L & TI also uses suffix of LV and V12 for MOSFET alternatives.
(ie ULN2003LV (above) and ULN2003V12)

These 4 parts have varying Vmax and RdsON & switching thresholds, so you can choose the best part.

The TPL7407L is smarter, with level shifting, so can drive fully from 1.5V in, but that gives a modest Iq and a somewhat higher price (higher voltage and higher current)

You can parallel pins, to lower the voltage drop if you have some spare.
These parts include clamp diodes.