Datasheet

PowerBoost is a DC/DC boost converter module that can run from 1.8V

batteries or higher, and convert that voltage to 5.2V DC for running

your 5V projects. With a beefy 4A DC/DC converter, it can give you

1A+ from as low as 2V.

The output has been tweaked to be 5.2V instead of 5.0V so that there's

a little bit of 'headroom' for long cables, high draw, the addition of a

diode on the output, etc. The 5.2V is safe for all 5V-powered

electronics like Arduino, Raspberry Pi, or Beagle Bone while preventing

icky brown-outs during high current draw because of USB cable

resistance.

The PowerBoost 1000 has at the heart a TPS61030 boost converter

from TI. This boost converter chip has some really nice extras such as

low battery detection, 4A internal switch, synchronous conversion,

excellent efficiency, and 700 KHz high-frequency operation.

PAGE 1
PowerBoost is a DC/DC boost converter module that can run from 1.8V batteries or higher, and convert that voltage to 5.2V DC for running your 5V projects. With a beefy 4A DC/DC converter, it can give you 1A+ from as low as 2V. The output has been tweaked to be 5.2V instead of 5.0V so that there's a little bit of 'headroom' for long cables, high draw, the addition of a diode on the output, etc. The 5.
PAGE 2
 Synchronous operation means you can disconnect the output completely by connecting the Enable pin to ground. This will completely turn off the output  4A internal switch means you can get 1000mA+ from as low as 1.8V, 1500mA+ from 2 NiMH or Alkaline batteries, and at least 2000mA from a 3.7V LiPoly/LiIon battery or 3 NiMH/Alkalines. Just make sure your batteries can actually supply the required 2-4A.  Low battery indicator LED lights up red when the voltage dips below 3.