Adafruit PowerBoost 500 Basic Created by lady ada Last updated on 2015-01-15 11:00:12 PM EST
Guide Contents Guide Contents 2 Overview 3 Pinouts 8 Power Pins 8 Control Pins 9 LEDs 9 Battery and USB connection 10 Downloads 11 Schematic 11 Fabrication Print 11 © Adafruit Industries https://learn.adafruit.
Overview PowerBoost is the perfect power supply for your portable project! (http://adafru.it/dFq)This little DC/DC boost converter module can run from 1.8V batteries or higher, and convert that voltage to 5.2V DC for running your 5V projects. Like our popular 5V 1A USB wall adapter (http://adafru.it/duP), we tweaked the output to be 5.2V instead of a straight-up 5.0V so that there's a little bit of 'headroom' for long cables, high draw, the addition of a diode on the output if you wish, etc. The 5.
The PowerBoost 500 (http://adafru.it/dFq) has at the heart a TPS61090 boost converter from TI (http://adafru.it/duQ). This boost converter chip has some really nice extras such as low battery detection, 2A internal switch, synchronous conversion, excellent efficiency, and 700KHz high-frequency operation. Check out these specs! Synchronous operation means you can disconnect the output completely by connecting the ENable pin to ground. This will completely turn off the output 2A internal switch (~2.
Great for powering your robot, Arduino project, single-board-computer such as Raspberry Pi or BeagleBone! Each order comes with one fully assembled and tested PCB and a loose USB A jack. If you are powering your project from USB, solder the USB A jack in (a 3-minute soldering task). If you would like to use a terminal block, pick up a 3.5mm 2pin block here (http://adafru.it/duR) and solder to the output spot where the USB jack would go. Or dont solder anything in for a more compact power pack.
If you're trying to figure out how much current your project is using, check out the CHARGER DOCTOR! (http://adafru.it/1852) © Adafruit Industries https://learn.adafruit.
© Adafruit Industries https://learn.adafruit.
Pinouts For many people, the PowerBoost can be used with just the power input and power outputs. However, we have a couple handy breakouts so lets get started! Power Pins There's two power 'ports' - an input (called BAT) and an output (called 5V) BAT - this is the battery input, it can range from 1.8V to 5V. Higher voltages will let you draw more current and in general, are more efficient. Try to keep the wires going to this pin nice and short - 3" or less is best! GND - this is the power ground.
this pin which will let you know when there's power output Control Pins There's two 'control' pins. EN - this is the 'enable' pin. By default it is pulled 'high' to VBAT. To turn off the booster, connect this pin to ground. The switch can be as small as you like, it is just a signal. Contrast this to an inline power switch which would have to be able to handle up to 2A of current! When the chip is disabled the output is completely disconnected from the input.
Battery and USB connection You can connect a battery to the breakout strip or to the JST connector. All of Adafruit batteries come with JST cables that will plug in nicely. Watch the po larity o f the cable! the + and - markings next to the JST will let you know which way is which. The USB connector can be soldered on to create a portable 'USB power pack'. The two data lines on USB have resistor dividers that match Apple charger values so that you can plug any iOS device in to charge.
Downloads TPS61090 datasheet (http://adafru.it/duS)(the DC/DC boost control chip used) Schematic Fabrication Print Dimensions in Inches © Adafruit Industries https://learn.adafruit.
© Adafruit Industries Last Updated: 2015-01-15 11:00:13 PM EST Page 12 of 12