[Oshpark] HQ 15mm/17mm programmable boost driver with ATtiny13A

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HarleyQuin
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True, the SOIC8 MCUs align so well with the programming key, that it falls together quite naturally.
I tried the QFN Attiny13A shortly, but there was more routing to do, with very tiny traces, and hardly any space gained. I ended using the SSU again. I implemented the programming footprint on several drivers lately, and it worked so well, that I’m really happy with it.

Oshpark Boards:
HQ ProgKey: Universal Driver Programming Key . Boost: HQ 15mm/17mm programmable boost driver with ATtiny13A
46mm Triple-Channel: BLF SRK FET v3 . 17mm Linear: HQ10D / HQ4D / HQ4S . Contact Boards: 22/24/26mm

Gunga
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I’d love to see a real programmable boost driver actually go into production!

Lexel
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kikkoman wrote:
The QFN20 package looks like a good idea at first, but it heavily depends on the board. You can’t route under it, so it’s either around the package or via vias (not always possible) and you may end up with no real space saved vs. the SOIC.
It’s not really an adequate package either, 12 pins are unused (and Atmel / µC advise against connecting them, so even using them for a convenient ground pin may or may not cause issues Facepalm )

The one package that would really save space in the lineup is the 8-pin TSSOP. 0.65mm pitch, a bit over half the size of the SOIC. Unfortunately, only the 45 and 45V are available in that format.

I just saw the 13 also comes in a 10-pin QFN package now. Might make sense in small drivers.

the routing of the Tiny25/85 in qfn package is quite easy
for the unused pins I simply removed the pads on the board so routing gets easier

But to use an uniform key for qfn package is not easy as its require some space as well

here examples that simply use programming solder pads
17mm/23mm single sided

20mm/12mm

kikkoman
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Lexel wrote:
kikkoman wrote:
The QFN20 package looks like a good idea at first, but it heavily depends on the board. You can’t route under it, so it’s either around the package or via vias (not always possible) and you may end up with no real space saved vs. the SOIC.
It’s not really an adequate package either, 12 pins are unused (and Atmel / µC advise against connecting them, so even using them for a convenient ground pin may or may not cause issues Facepalm )

The one package that would really save space in the lineup is the 8-pin TSSOP. 0.65mm pitch, a bit over half the size of the SOIC. Unfortunately, only the 45 and 45V are available in that format.

I just saw the 13 also comes in a 10-pin QFN package now. Might make sense in small drivers.

the routing of the Tiny25/85 in qfn package is quite easy
for the unused pins I simply removed the pads on the board so routing gets easier

But to use an uniform key for qfn package is not easy as its require some space as well

here examples that simply use programming solder pads

But the first two (three?) are 4-layer boards, right? But even with that, without using blind vias ($$$) all you can put below the µC pad are ground vias…

Talking about complex PCBs, I’m pretty sure one of the TaskLED drivers (bFlex?) had a tiny QFN part sitting in a milled cutout under another chip, soldered to an internal layer. IIRC. Don’t ask me why, it as a 25mm board with plenty of space. Maybe they wanted to prevent cheap copies.

Lexel
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kikkoman wrote:
Lexel wrote:
kikkoman wrote:
The QFN20 package looks like a good idea at first, but it heavily depends on the board. You can’t route under it, so it’s either around the package or via vias (not always possible) and you may end up with no real space saved vs. the SOIC.
It’s not really an adequate package either, 12 pins are unused (and Atmel / µC advise against connecting them, so even using them for a convenient ground pin may or may not cause issues Facepalm )

The one package that would really save space in the lineup is the 8-pin TSSOP. 0.65mm pitch, a bit over half the size of the SOIC. Unfortunately, only the 45 and 45V are available in that format.

I just saw the 13 also comes in a 10-pin QFN package now. Might make sense in small drivers.

the routing of the Tiny25/85 in qfn package is quite easy
for the unused pins I simply removed the pads on the board so routing gets easier

But to use an uniform key for qfn package is not easy as its require some space as well

here examples that simply use programming solder pads

But the first two (three?) are 4-layer boards, right? But even with that, without using blind vias ($$$) all you can put below the µC pad are ground vias…

Talking about complex PCBs, I’m pretty sure one of the TaskLED drivers (bFlex?) had a tiny QFN part sitting in a milled cutout under another chip, soldered to an internal layer. IIRC. Don’t ask me why, it as a 25mm board with plenty of space. Maybe they wanted to prevent cheap copies.

17mm first is 4 layer
2. I got Buck version in 2 layer
both are basically 4 layer because of the 13 pin boost chip not the MCU

Lexel
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I was also noticing working on 17mm with programming port that the QFN package very well align with my key

skinny_tie
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HarleyQuin wrote:
HQB17D v1

The arrival of the Convoy T2 revived my interest and I shared 2 new drivers, the HQB17C and the HQB17D, that are made specifically with the T2 in mind. Both are 17mm boost drivers.

I’m exited to see you’re continuing to develop your boost drivers HarleyQuin.

There seems to be a real lack of decent AA boost drivers – just finding something with fast PWM and no strobes is difficult.

I’m a long way from having the skills to assemble a driver myself butwhen I do your boost drivers will be at the top of my list.

HarleyQuin
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You’re welcome. The new 17mm boards should be much easier to assemble than the 15mm ones.

I admit I would have much more preferred when Convoy used a driver with an Attiny. Would have made it a lot easier.

But now I can’t wait for the 17D board to arrive myself, I’m really curious how they turn out. When I get it done successfully I will make a detailled partlist.

Oshpark Boards:
HQ ProgKey: Universal Driver Programming Key . Boost: HQ 15mm/17mm programmable boost driver with ATtiny13A
46mm Triple-Channel: BLF SRK FET v3 . 17mm Linear: HQ10D / HQ4D / HQ4S . Contact Boards: 22/24/26mm

Bourbon Guy
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Has anyone successfully built a 17D yet? I took a couple shots at it and failed to get a driver working. I haven’t built drivers in a long time so the problem is probably on my end.

I did successfully build a 17B and install it in a convoy T2 with a mutilated version of star. If my settings are right I’m using 9.6MHz cpu speed and fast PWM to get the lowest low. Still not very low but I’m using a 3v xhp50 and TIR which isn’t helping that case.

buck91
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Is anybody making these for sale?

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