 Hi, NMPI. Hi, NMPI, I brought you by Digikey. Thank you, Digikey, for making this thing possible. It's from analog devices. Yes. Return IonMPI spotlight. We've done analog devices. And well, now, this is actually a maxim part, but analog devices and maxim barge. So it's analog devices slash maxim, but picked one logo. So this week, we're going to be talking about the Max 777, 89, and 87 chips. This is so hot off the press, there aren't even photos of the chip. It's in the middle of this avalboard there. And this is an all-in-one power management chip that can do USB Type-C power delivery syncing, buck charging of a large battery pack, and then boosting back up to 5.1-ish volts. So let's talk about what this is. So in the days before, in the Dark Ages, we had power packs that would plug into your wall, wall warts, and you'd have to pick different DC jacks. You see, like, there's six different jack types, 2.1, 1.3, 0.9, and you'd have to get the polarity right. And then you'd select the voltages. And this is a selectable one, but usually you don't get to select the voltages. And this caused a lot of problems because people would plug in the wrong voltage. So you had to protect against that. And then also you would have the right amount of current available. And basically, you ended up lugging around from apartment to apartment gigantic boxes of power bricks because you can never remember which one went to which. If you threw it out, you're like, I'm never going to get it again. Last few years, we have been working as engineers to try to replace those power bricks with USB Type-C. So here is USB Type-C laptops slash tablet charger that can charge almost every device. And you see on the output, it can do 5, 9, 12, 15, or 20 volts. This is a nice, chunky power supply. It can do up to 65 watts, 20 volts at 3.25 amps. So I think it can power a small laptop, a big tablet, any kind of phone, any kind of watch, any device from the house. So ideally, people would use this in the USB-C cable to charge their devices. And we're starting to see that, starting to see more devices. Here's like a power delivery sync chip that can talk to your power delivery source, the Woolward, and say, hey, I want 12 volts at 2 amps, and it will get that voltage. So whether you need a low voltage or high voltage, whatever something in between, up to 20 volts, you can get it. And this has been great for your devices that you're buying from your laptops to GPSs, to mobile phones, et cetera. But there's other devices that could benefit from this. Here is, say, a USB power pack. Probably everyone has one of these. This is a pretty chunky one. There's three ports, two USB-A outputs, and one micro USB input. In this case, you can charge this pack, takes a couple hours, because you can only draw maybe an amp from the 5-volt power supply to charge the, I think, 6,000 or 8,000 milliamp hour battery inside. And then you can supply two 5-volt, one or two amp outputs. But a lot of stuff these days, even like this overhead that we use has a built-in battery. A lot of devices have very large built-in lithium ion, lithium polymer, lithium comal batteries. You need to charge them. And once you get to 2,000 milliamp hours or larger, it's very hard to charge them over a 5-volt power supply because, let's say you, first off, most 5-volt power supplies are gonna give you two plus amps. USB is only gonna max out at one amp. But even if you did want to draw that much current, let's say you had a power supply that did 5-volt 2.5 amps, the 2.5 amps across the cable is going to give you a drop that might make your charger not be able to sync the full amount of current because you sync 2.5 amps. You have a 0.1 ohm resistance to your cable, both directions, now you've dropped about 0.2 volts. You know, maybe the power supply droops also. So now you're getting close to 4.5 volts, not enough headroom to charge your LiPoly battery, considering all the other dropouts you might have with your transistors and your chips and sense resistors, et cetera. And so if you want to charge really big battery packs, ones in tablets, ones in phones, large phones, laptops, and other big devices, you're gonna want something that can charge at three amps and get you higher voltages. But again, you don't wanna have that special power pack with a special DC plug that gets lost. Thus, the analog devices slash maximum max 77789 and its friend the 77787, they're like sisters, they're fraternal twins. This one is the standalone version can do three amp charging over USB type C. So it will request from the USB type C power delivery source up to 12 volts, which is nice because then again, if you're drawing three amps, if you droop from 15, you know, 12 volts, okay, now droops one amp or whatever, you still have 12 volts to buck down to charge your battery. Three amps, you can easily quick charge in an hour or two of very, very chunky battery. And then it also has a boost converter so it can generate a reverse boost from that battery. It can generate 5.1 volts up to 1.5 amps. So handy if you're making those battery packs or if you're just using a device and it needs a boost converter as well. So this is the standalone version, the 89. There's also the 87 looks very similar but this one has I squared C control. So use whichever one makes more sense for your setup. They're both pretty autonomous but then you can configure them for how much current, the floating voltage, whether you want the boost converter on, et cetera. So this is the block diagram. This is the standalone version. So the standalone version, you see it connects over USB-C, uses the CC pins and those are used for power delivery. It also connects to DP and D and the differential data pins. And the reason it does that is there's pre-USBC, there are some power supplies that use the data pins to communicate how to configure and get the higher voltages. I think it's called BC 1.2, so it's pre-USBC. You have the one inductor that's used for both buck from the USB-C down to charging the battery up to three amps and that inductor is also used to boost up to V-System which can be up to 5.1 volts, 1.5 amps out. There's also, yes, for the configuration, there's a bunch of pins and resistors. You can set different voltages and different currents and then whether you want to buck boost, buck boost both on the go, detection mode, all that good stuff. This is the I2C version, the 89, very, very similar, same overall functionality, except instead of setting the state and floating voltages and currents with resistors, you have I2C connectivity, both still have LEDs that indicate status, so it's kind of handy. With the I2C version, you have a register map, all the same functionality, but of course, you're not using resistors, so you can customize it on the fly as needed, but you have to have a microcontroller. So if you're making a basic battery pack or something that's standalone, let's say you are making an electric drill, you want to have charging, USB-C charging of the drill power pack. You'd use a standalone because maybe you don't have a microcontroller in there, but you have something like a tablet or a phone or another smart device. You have a microcontroller anyways or a microcomputer, you might as well do the configuration over I2C. Usage is pretty simple. It's got current limiting and overcurrent protection. It's meant for big batteries, but you could use it for smaller ones, just set the current limiting to a lot lower. I think it also has multiple different float voltages available from 4.1 up to like 4.4. I know that depending on your cathodes, I tend to only use lithium polymers, but I know that other batteries have up to 4.4 volt floating. So it will support those, whatever battery type you use, but only single cell, by the way, will not do 7.2 volts. It'll only do 3.7, 4.2 approximate single cell lithium chargeable batteries. Yes, so it does USB-C detection with the CC pin. It will automatically configure to get the most power available to charge. I think it'll probably try to get higher voltages because again, less droop over the power supply. It also does this BC 1.2 detection. I mean, I personally have never really used this, but I think it has to do with the resistors that Apple used to use for their pre-USB-C, pre-lightening power charging cables where they use resistor dividers to indicate, like light resistors to indicate to the device how much current is available. I know that this also, the chip also has the ability to detect when the voltage is starting to droop a little bit too much. It will lean off how much current it's trying to source from the power supply so it doesn't get into like a voltage current collapsing cycle. If you do use the data pins for detection of that BC 1.2, they do recommend, I think it was the Max 4809, is a switch you can use to select who gets access to the data pins, whether it's your microcontroller for native USB support or this charger chip. Honestly, I think probably best to leave them disconnected and just use USB type C, but it looks like they have the capability available to add both, so you choose which one you want. Only downside for me at least, is that it's a VGA 0.4 millimeter pitch. So you will need to, I'll show the layout, you'll need to have pad via in pad. So you're gonna have to use a fairly, not advanced, but not the cheapest PCB you can get on the market or to handle it, I think four layer boards as well are going to be needed. This is the recommended layout. So you'll see some of those pins on the inside, the setting pins, not the power pins, you do have to go through the pad and down to another layer to get them out. So there are other chips in this generic family, not like this particular 87 or 89, that come in like a QFN style package, not quite QFN, but QFN-like. So if you don't need a VGA, there are other Max, look for Digi-Key Max 777, you can see the rest of the family, maybe it's gonna have quite the current capability or like all the configurability, but it's available in a non-VGA. That's on Digi-Key. It's in stock, 16,000 of them. You can absolutely get these. So check this out, this is the 89, but again, there's also the 87, depending on whether you want I squared C configuration or standalone. And that's our MPI this week. MPI on MPI.