Thx. My pleasure.
Here is the next version of the 15mm boost driver
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HQB15 v3
It’s still the basic circuit (including R2 and R3, no LVP)
I think this is as much as I could get out of this 15mm design, so for now there is no v4 planned.
It’s about time for building and testing.
Notable changes from v2 to v3:
- more GND vias
- GND plane slightly increased
- 3 plus vias moved outside the L1-pad
- some copper pads increased over stopmask
- MCU moved slightly inwards
It’s still 15.6mm outer diameter, so the copper GND ring is 0.3mm smaller than it does look on these pictures.
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When installing into a light it’s crucial that D1, R3 or the FET don’t get electrical contact with the flashlight body/pill. This might be tight and could risk shorting the light.
Same goes with the LED leads (LED+/LED-). Both must avoid GND.
Pin1 on the ATtiny (RST) has no pad on purpose. That way I could move the whole component slightly down to keep pin1 of the ATtiny (VCC!) away from the side.
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Parts size
(more on parts and values see partlist overview in post#2)
Switch: PAM2803, SOT-23-6
L1: max 4.3x4.3mm
D1: BAT60A, SOD323
C1: 0805
C2: 0805
C3: 0603 (optional)
R1: 0805
R2: 0603
R3: 0603
MCU: ATTiny13A-SSU, 8S1
OTC: 0603 (optional)
FET: N-Channel, SOT-23-3
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