# First schematics, DC-DC Converter question

I've made my first PCB design and I am unsure about a few things. This is a H-Bridge with a Attiny85. The Attiny85 will read a analog input on PB4 and adjust the PWM based on that. It is powered by a 14-18V Lio-io battery. I expect a load of max 180W.

My first question is if the DC-DC converter will work with a battery. Is there anything I need to pay attention to. I've just drawn the schematics based on the recommended design, which was for 12V IN and 5V OUT, will this also work for 14-18V IN since the IC supports that in general ?

If there is anything else that I did wrong I would like to hear that too, thank you.

Edit2: based on the suggestions I've changed a few things, maybe it is better now

• I've made my first PCB design Well, you've drawn a schematic. No PCB in sight yet. I see that this design already has an issue: the left side looks OK but on the right side all the NPNs and PNPs appear to upside down. There's no supply decoupling capacitor for the Attiny (C4 is for the DCDC). Also note that an 180 W (that's around 10A) will be a challenge for a beginner. If you don't cater for that large current your PCB will not work and/or your tracks will evaporate! Have you watched any of Dave's videos at EEVBlog? See youtube.com/c/EevblogDave/search?query=PCB+design Aug 13 '20 at 11:20
• Regarding your actual question: what does the datasheet of the DCDC converter chip say? Are you exceeding maximum ratings? You may ask here: "Will this also work for 14 - 18 V" but to answer that anyone will need to consult the datasheet, so would it not make more sense if you first looked that yourself? Include a link to the datasheet of that DCDC chip! Aug 13 '20 at 11:28
• @Bimpelrekkie I've added the datasheet to the post. I've looked into it, my concern was that I've created the schematic based on the 12V recommendation. I know the IC can take a VIN up to 20V but I don't know how the schematic will change if the voltage gets higher. Aug 13 '20 at 11:36
• Start here: Rules and guidelines for drawing good schematics. Voltages go upwards, grounds go downwards for example. Aug 13 '20 at 12:48
• @Stackoverflowsuperbad - Hi, I've rolled-back the deletion of the schematic since, without that, the rest of the question / answers / comments make less sense. If you have a valid reason to remove information, I recommend you either raise a topic in Meta for discussion or flag your question and explain your reasons to a moderator. Thanks! Oct 21 '20 at 16:19

$$\color{red}{\boxed{\text{It's really important that you do a thorough circuit simulation}}}$$